Lazy IITians – Viva Prep

See reviews Level1_135 MAD1 Level 1

Jul 31, 2026

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1

Demonstrate the complete application.

Times asked 33

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
2
Explain models.py.

Times asked 21
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
3
Explain relationships between models.

Times asked 3
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
4

Explain cascade.

Times asked 2

Official solution

SimpleCascade parent ke saath child pe automatic action (generally delete).
Company delete → uski drives bhi delete, warna orphan rows / FK error.
SQLAlchemy: db.relationship('Drive', cascade='all, delete-orphan', backref='company')
SQL: ForeignKey(..., ondelete='CASCADE')
Cascade sirf delete nahi: save-update, merge, refresh-expire, expunge, delete-orphan.
Cascade Update: parent PK change to child FK update (rare, PK mat badlo).
Parent delete jab children active hon: constraint error, ya cascade se children gayab, ya pehle children handle karo — design choice examiner poochta hai.
CSS cascading alag topic hai (styles inherit/override).
5
Explain lazy loading.

Times asked 3
Official solution

Simplelazy loading related objects tab load karta hai jab attribute access karte ho, pehle nahi.
```
user = User.query.get(1)  # posts query nahi
```
user.posts # ab query
lazy=True / 'select' default. lazy='joined' eager join. lazy='dynamic' query object.
uselist=False One-to-One (single object, list nahi). Hataoge to list mil sakti hai.
Frontend lazy loading images alag cheez hai (viewport mein aaye tab load).
6

Add a new column to a model and update the frontend and database to store the new field.

Times asked 1

Official solution

Simple 4-step: Model → DB → Form → Route → Template. Yeh sabse common live-coding hai.
1) models.py: age = db.Column(db.Integer, nullable=True)
2) DB: SQLite viewer se column, ya DB delete karke create_all, ya ALTER TABLE user ADD COLUMN age INTEGER; production mein Flask-Migrate.
3) register.html: <input type='number' name='age' min='18' required>
4) route: user.age = request.form.get('age', type=int); commit
5) dashboard: {{ user.age }} admin table mein <td>{{ u.age }}</td>
Print terminal: print('AGE', request.form.get('age'))
Phone/city same pattern, String(20). Openings on Drive: integer column + form + create_drive route.
7

Explain your routes.

Times asked 2

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
8
Modify an existing route.

Times asked 1
Official solution

Yeh MAD-1 viva question tumhare project ke context se linked hai. Short answer is structure se do:
Pehle 1 line definition/purpose, phir tumhare project ka example, phir chhota code/flow.
Typical Flask flowBrowser request → @app.route controller → SQLAlchemy model/DB → Jinja template response.
Auth: session['user_id'] + role check. CRUD: add/commit, query.all, field update, delete.
Live change maange to: related model → route → template, phir browser refresh karke dikhao.
Example (generic create):
obj = Model(name=request.form.get('name'))
```
db.session.add(obj); db.session.commit()
return redirect(url_for('list_view'))
```
9
What is Flask?

Times asked 6
Official solution

SimpleFlask Python ka micro web framework hai — routes, templates, request/response handle karta hai.
```
from flask import Flask
app = Flask(__name__)
@app.route('/')
def home():
    return 'Hello'
app.run(debug=True)  # default port 5000
```
__name__ se Flask ko pata chalta hai templates/static kahan se load karni hai. Hataoge to resource paths toot sakte hain.
Faydesimple, flexible, MAD1 syllabus. Nuksaan: bade features (admin, auth) khud jodne padte hain.
```
app.run() development server start karta hai. Production mein gunicorn/waitress.
```
10
Explain the tech stack/frameworks used.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
11
What is Bootstrap?

Times asked 5
Official solution

SimpleBootstrap CSS/JS framework — ready classes se responsive UI.
```
<button class='btn btn-primary'>Save</button>
```
Red button: btn btn-danger. Navbar, cards, grid (row/col).
CDN: <link href='https://cdn.jsdelivr.net/npm/bootstrap@5...'> — internet na ho to style toot sakti hai. Local copy safer viva ke liye.
CSS vs Bootstrap: Bootstrap faster consistent UI, custom CSS fine-control. Dono saath use ho sakte hain.
aria-current='page' accessibility — current nav item screen readers ko.
CDN fayda: cache, quick setup. Nuksaan: offline, privacy, version lock.
12
Where and how have you used Bootstrap?

Times asked 1
Official solution

SimpleBootstrap CSS/JS framework — ready classes se responsive UI.
```
<button class='btn btn-primary'>Save</button>
```
Red button: btn btn-danger. Navbar, cards, grid (row/col).
CDN: <link href='https://cdn.jsdelivr.net/npm/bootstrap@5...'> — internet na ho to style toot sakti hai. Local copy safer viva ke liye.
CSS vs Bootstrap: Bootstrap faster consistent UI, custom CSS fine-control. Dono saath use ho sakte hain.
aria-current='page' accessibility — current nav item screen readers ko.
CDN fayda: cache, quick setup. Nuksaan: offline, privacy, version lock.
13

Change the color of a button.

Times asked 5

Official solution

Simpleexaminer UI tweak maangta hai — CSS class ya inline, instantly dikhao.
Button color: <button class='btn btn-success'> ya style='background:#22c55e;color:#fff'
Navbar: navbar-dark bg-success / style='background:yellow' / fixed-bottom se neeche.
Center: .wrap { display:flex; justify-content:center; align-items:center; min-height:100vh; }
text-align:center heading ke liye. Bootstrap: d-flex justify-content-center, mx-auto, text-center.
Hover: .btn:hover { opacity:0.8; transform:scale(1.02); }
Half width: class='col-6' ya width:50%. Row→column: flex-direction:column / col-12 stack.
Login card: card shadow p-4 mx-auto (max-width:400px).
Table header green: th { background:green; color:white; } Bold column: td:nth-child(2){font-weight:bold}
Box shadow: box-shadow: 4px 4px 12px rgba(0,0,0,.3);
Background image: body { background: url('/static/bg.jpg') center/cover; }
Reset button: <button type='reset'>Clear</button>
Move button: ms-auto / position / flex order.
Jinja dashboard heading: <h1>{{ user.name }}'s Dashboard</h1>

See reviews Level2_142 MAD1 Level 1

Jul 31, 2026

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1

Show your College ID.

Times asked 16

Official solution

SimpleCamera pe clearly IITM/college ID dikhao — naam photo match.
Pehle se ID haath mein rakho. Glare mat aane do. Examiner screenshot/verify karta hai. Iske baad GitHub + project run.
2

Show your GitHub repository and collaborator.

Times asked 16

Official solution

SimpleGitHub repo public/private policy ke hisaab, MAD-1 collaborator add, commits dikhao.
Repo → Settings → Collaborators → instructor added.
Commits: git log / GitHub History — regular commits better, ek dum 1 commit suspicious.
README + report mein AI usage likha hona chahiye agar use kiya.
3

Show AI/LLM usage percentage and whether it is mentioned in the report.

Times asked 1

Official solution

SimpleSach bolo. AI se boilerplate/docs theek, logic samajh ke explain karo.
'Boilerplate aur CSS ke liye AI use kiya, models/routes khud design kiye. Report mein X% mention hai.'
Line-by-line nahi explain kar paoge to examiner pakad lega. Documentation: official Flask/SQLAlchemy + course lectures.
4

Download the project from the Viva Portal or perform checksum.

Times asked 5

Official solution

SimpleChecksum file ka hash (jaise SHA256) — file change hui ya nahi verify.
Portal pe submitted ZIP ka checksum diya hota hai. Local file ka hash nikaalo, match hona chahiye.
Linux: sha256sum project.zip
Mismatch = galat file / corrupt download. Examiner integrity check karta hai ki tumhari submitted copy hi run ho rahi hai.
5

Run the application.

Times asked 8

Official solution

SimpleExaminer submitted ZIP chahta hai, local extra changes nahi.
Portal se ZIP download → extract → venv → pip install -r requirements.txt → flask run / python app.py.
Checksum maange to hash match karke dikhao. Camera/OPPE setup unke instructions.
Linux/Mac: paths, gunicorn; Windows paths alag ho to relative paths use karo.
Do browsers: admin + user parallel demo impressive lagta hai.
6

Demonstrate the complete application.

Times asked 33

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
7

Perform all CRUD operations as Admin.

Times asked 2

Official solution

SimpleCRUD = Create, Read, Update, Delete — kisi bhi resource ke 4 basic operations.
Create: POST, db.session.add(new_user); commit() — register, add trek.
Read: GET, User.query.all() — dashboard list.
Update: POST/PUT, user.name = 'Ram'; commit() — edit profile.
DeletePOST/DELETE, db.session.delete(obj); commit().
REST mapping: POST create, GET read, PUT/PATCH update, DELETE delete.
Admin panel mein yeh 4 dikhana viva demo ka common task hai.
8

Show all user roles and their functionalities.

Times asked 1

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
9

Show the Summary/Dashboard.

Times asked 1

Official solution

Yeh feature demo hai. Account ready rakho, steps bol ke dikhao.
Role ke hisaab login → action (create/approve/book) → DB/UI pe result → edge case (fail when slots=0 / blacklisted).
Do browser windows: admin + user. Search/filter alag se dikhao.
Agar feature nahi hai to sach bolo aur 2 minute mein kaise add karoge (query + template) explain karo.
10

Show registered users.

Times asked 1

Official solution

Yeh feature demo hai. Account ready rakho, steps bol ke dikhao.
Role ke hisaab login → action (create/approve/book) → DB/UI pe result → edge case (fail when slots=0 / blacklisted).
Do browser windows: admin + user. Search/filter alag se dikhao.
Agar feature nahi hai to sach bolo aur 2 minute mein kaise add karoge (query + template) explain karo.
11

Show booking flow and booked records.

Times asked 1

Official solution

Yeh feature demo hai. Account ready rakho, steps bol ke dikhao.
Role ke hisaab login → action (create/approve/book) → DB/UI pe result → edge case (fail when slots=0 / blacklisted).
Do browser windows: admin + user. Search/filter alag se dikhao.
Agar feature nahi hai to sach bolo aur 2 minute mein kaise add karoge (query + template) explain karo.
12
Explain how the estimated cost/price is calculated.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
13

Test project-specific scenarios (e.g., duplicate booking prevention, blacklist login, remember-me feature).

Times asked 1

Official solution

SimpleDuplicate/overbook rokne ke liye DB constraint + route check dono.
Pehle query: Booking.query.filter_by(user_id=uid, trek_id=tid).first()
Agar exists: flash('Already booked'); return
Slots: if trek.available <= 0: reject else trek.available -= 1; commit
Race condition: unique(user_id, trek_id) constraint — do tabs se double click pe bhi ek hi row.
Blacklist: login pe is_blacklisted check.
Active drive limit: if Company ke paas status=open drive hai to naya mat banne do.
SimpleBlacklist flag user/company ko block karta hai — login ya features band.
user.is_blacklisted = True; db.session.commit()
Login: if user.is_blacklisted: flash('Blocked'); return
Student dashboard: blacklisted company ke drives hide — query filter join Company.is_blacklisted==False.
Demo: admin blacklist → us user se login fail.
14

Explain the project directory/folder structure.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
15
Explain models.py.

Times asked 21
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
16

Show where Admin is created in the code.

Times asked 1

Official solution

Yeh feature demo hai. Account ready rakho, steps bol ke dikhao.
Role ke hisaab login → action (create/approve/book) → DB/UI pe result → edge case (fail when slots=0 / blacklisted).
Do browser windows: admin + user. Search/filter alag se dikhao.
Agar feature nahi hai to sach bolo aur 2 minute mein kaise add karoge (query + template) explain karo.
17

Explain a specific route.

Times asked 2

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
18
Show where Jinja2 is used in the project.

Times asked 1
Official solution

SimpleJinja2 Flask ka template engine hai. HTML ke andar Python-jaisa data print/loop/if kar sakte ho.
Bina Jinja har user ke liye alag HTML file. Jinja se ek template + data.
```
{{ user.name }} print, {% for x in items %} loop, {% if %} condition, {% extends %} layout.
```
Example routereturn render_template('dash.html', treks=treks)
dash.html: {% for t in treks %}<li>{{ t.name }}</li>{% endfor %}
HTML files templates/ folder mein isliye kyunki Flask default wahan dhundhta hai. render_template Jinja ko run karta hai.
Boolean Jinja handle karta hai: {% if user.is_admin %}.
19

Show where MVC is implemented.

Times asked 1

Official solution

SimpleMVC = Model-View-Controller. Code ko 3 hisson mein baant ta hai taaki mix na ho.
Model: data + DB. models.py — User, Trek, Booking classes.
View: jo user dekhta hai. templates/*.html + Jinja.
Controller: beech ka logic. routes / app.py — request lo, model se data, view ko do.
Example flow (register):
Browser form POST → Controller register() → User model save → redirect → View dashboard.html
Draw: Browser → Controller → Model → DB, phir Controller → View → Browser.
ORM na ho to bhi MVC ho sakta hai — Model raw SQL functions ho sakte hain. Structure matter karta hai, library nahi.
MVP/MVVM doosri architectures hain; MAD1 mein MVC expected hai.
20

Which database have you used?

Times asked 4

Official solution

SimpleSQLite file-based chhota DB, MySQL/Postgres server-based production DB.
SQLite fayde: zero setup, ek .db file, MAD1/dev ke liye perfect, portable.
Nuksaanconcurrent writes kam, user/password nahi, network access nahi, production scale nahi.
MySQL: users, permissions, concurrent, replica. App factory mein URI change karke switch: sqlite:///app.db → mysql://...
21
How many database tables are used?

Times asked 1
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
22
Explain the database models.

Times asked 2
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
23

How are User and Admin differentiated?

Times asked 1

Official solution

SimpleRBAC = Role-Based Access Control — permission role se (admin/staff/user), har user pe alag nahi.
user.role = 'admin'
if current_user.role != 'admin': abort(403)
Same login page, role ke hisaab dashboard. Multiple roles: roles table Many-to-Many, ya comma field (behtar normalized table).
Unapproved staff: is_approved flag, login pe check.
Flask-Security/UserMixin is_authenticated, is_active, get_id dete hain.
24
What is ORM?

Times asked 49
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
25
Which ORM have you used?

Times asked 3
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
26
Why is ORM used?

Times asked 2
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
27

What is Cascade?

Times asked 4

Official solution

SimpleCascade parent ke saath child pe automatic action (generally delete).
Company delete → uski drives bhi delete, warna orphan rows / FK error.
SQLAlchemy: db.relationship('Drive', cascade='all, delete-orphan', backref='company')
SQL: ForeignKey(..., ondelete='CASCADE')
Cascade sirf delete nahi: save-update, merge, refresh-expire, expunge, delete-orphan.
Cascade Update: parent PK change to child FK update (rare, PK mat badlo).
Parent delete jab children active hon: constraint error, ya cascade se children gayab, ya pehle children handle karo — design choice examiner poochta hai.
CSS cascading alag topic hai (styles inherit/override).
28

Can Cascade be used for operations other than Delete?

Times asked 1

Official solution

SimpleCascade parent ke saath child pe automatic action (generally delete).
Company delete → uski drives bhi delete, warna orphan rows / FK error.
SQLAlchemy: db.relationship('Drive', cascade='all, delete-orphan', backref='company')
SQL: ForeignKey(..., ondelete='CASCADE')
Cascade sirf delete nahi: save-update, merge, refresh-expire, expunge, delete-orphan.
Cascade Update: parent PK change to child FK update (rare, PK mat badlo).
Parent delete jab children active hon: constraint error, ya cascade se children gayab, ya pehle children handle karo — design choice examiner poochta hai.
CSS cascading alag topic hai (styles inherit/override).
29

Is your database normalized?

Times asked 3

Official solution

SimpleNormalization data ko split karke redundancy aur update-anomalies kam karti hai.
1NF: atomic values, repeating groups nahi (comma-separated skills mat rakho).
2NF: 1NF + non-key columns poori PK pe depend (composite keys pe).
3NF: 2NF + non-key columns ek doosre pe depend na hon (city→state alag table).
Examplehar booking mein user ka poora address copy vs user_id se User table.
MAD1 project generally 3NF ke kareeb. Higher NF (BCNF) theoretically, practical apps denormalize speed ke liye (cached counts).
Leaderboard: alag table better agar history/rank chahiye; sirf count hai to query se bhi ho sakta hai.
30

Explain the Normal Forms (1NF, 2NF, 3NF, etc.).

Times asked 1

Official solution

SimpleNormalization data ko split karke redundancy aur update-anomalies kam karti hai.
1NF: atomic values, repeating groups nahi (comma-separated skills mat rakho).
2NF: 1NF + non-key columns poori PK pe depend (composite keys pe).
3NF: 2NF + non-key columns ek doosre pe depend na hon (city→state alag table).
Examplehar booking mein user ka poora address copy vs user_id se User table.
MAD1 project generally 3NF ke kareeb. Higher NF (BCNF) theoretically, practical apps denormalize speed ke liye (cached counts).
Leaderboard: alag table better agar history/rank chahiye; sirf count hai to query se bhi ho sakta hai.
31
What is app.config["SECRET_KEY"]? Why is it required?

Times asked 1
Official solution

SimpleSECRET_KEY Flask ka secret jisse session cookies sign/encrypt hoti hain.
```
app.config['SECRET_KEY'] = os.getenv('SECRET_KEY', 'dev-key')
```
Iske bina session/flash unreliable ya insecure. Key leak = attacker session forge kar sakta hai.
Hardcode mat karo production mein — .env / environment variable. Flash messages bhi session use karti hain, isliye SECRET_KEY se related hain.
Hataane pe session kaam nahi / warning. Change karne pe purane sessions invalid.
32
What happens if SECRET_KEY is not defined?

Times asked 1
Official solution

SimpleSECRET_KEY Flask ka secret jisse session cookies sign/encrypt hoti hain.
```
app.config['SECRET_KEY'] = os.getenv('SECRET_KEY', 'dev-key')
```
Iske bina session/flash unreliable ya insecure. Key leak = attacker session forge kar sakta hai.
Hardcode mat karo production mein — .env / environment variable. Flash messages bhi session use karti hain, isliye SECRET_KEY se related hain.
Hataane pe session kaam nahi / warning. Change karne pe purane sessions invalid.
33
What is app.app_context().push()? Why is it used?

Times asked 2
Official solution

SimpleApplication context app-level data (config, db), Request context ek HTTP request (request, session).
Request ke andar Flask khud context push karta hai. Scripts/shell mein db query ke liye:
```
with app.app_context():
    User.query.all()
```
app.app_context().push() same, lekin with better (cleanup).
current_app proxy current Flask app ki taraf. Factory pattern mein import app cycle avoid.
Request context ke bahar request.form error dega.
34
What is app = Flask(__name__)?

Times asked 1
Official solution

Simpleapp = Flask(__name__) app banata hai; if __name__ == '__main__' tabhi server start jab file directly run ho.
```
app = Flask(__name__)
if __name__ == '__main__':
    app.run(debug=True, port=5000)
```
__name__ module ka naam. Direct run pe '__main__', import pe filename. Import karoge to server auto-start nahi — tests/blueprints ke liye zaroori.
debug=True: auto-reload + debugger. Production mein band rakho (security).
Port: app.run(port=8000) ya flask run --port 8000. Default 5000. Haan, change ho sakta hai.
35

What is MVC?

Times asked 9

Official solution

SimpleMVC = Model-View-Controller. Code ko 3 hisson mein baant ta hai taaki mix na ho.
Model: data + DB. models.py — User, Trek, Booking classes.
View: jo user dekhta hai. templates/*.html + Jinja.
Controller: beech ka logic. routes / app.py — request lo, model se data, view ko do.
Example flow (register):
Browser form POST → Controller register() → User model save → redirect → View dashboard.html
Draw: Browser → Controller → Model → DB, phir Controller → View → Browser.
ORM na ho to bhi MVC ho sakta hai — Model raw SQL functions ho sakte hain. Structure matter karta hai, library nahi.
MVP/MVVM doosri architectures hain; MAD1 mein MVC expected hai.
36
Why do we use __name__?

Times asked 1
Official solution

Simpleapp = Flask(__name__) app banata hai; if __name__ == '__main__' tabhi server start jab file directly run ho.
```
app = Flask(__name__)
if __name__ == '__main__':
    app.run(debug=True, port=5000)
```
__name__ module ka naam. Direct run pe '__main__', import pe filename. Import karoge to server auto-start nahi — tests/blueprints ke liye zaroori.
debug=True: auto-reload + debugger. Production mein band rakho (security).
Port: app.run(port=8000) ya flask run --port 8000. Default 5000. Haan, change ho sakta hai.
37
What is REST?

Times asked 3
Official solution

SimpleAPI = Application Programming Interface — do systems predefined rules se baat karti hain. REST API HTTP + JSON use karti hai.
Controller/route HTML bhi return kar sakta hai. REST API generally JSON return karti hai, frontend alag ho (Vue/Postman).
Example
```
@app.route('/api/users/<int:id>')
def get_user(id):
    u = User.query.get_or_404(id)
    return jsonify(id=u.id, name=u.name)
```
MAD1 HTML apps mein 'API' kabhi-kabhi routes ko hi keh dete hain. Agar Vue nahi to bolo: server-rendered Flask, JSON APIs optional.
Boolean return: technically jsonify(True) ho sakta hai, lekin meaningful JSON object better. Flask view None return kare to error.
Test: Postman se GET/POST.
Parsing: request.get_json() body se, request.args query se.
38

What are REST principles?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
39
What is an API?

Times asked 8
Official solution

SimpleAPI = Application Programming Interface — do systems predefined rules se baat karti hain. REST API HTTP + JSON use karti hai.
Controller/route HTML bhi return kar sakta hai. REST API generally JSON return karti hai, frontend alag ho (Vue/Postman).
Example
```
@app.route('/api/users/<int:id>')
def get_user(id):
    u = User.query.get_or_404(id)
    return jsonify(id=u.id, name=u.name)
```
MAD1 HTML apps mein 'API' kabhi-kabhi routes ko hi keh dete hain. Agar Vue nahi to bolo: server-rendered Flask, JSON APIs optional.
Boolean return: technically jsonify(True) ho sakta hai, lekin meaningful JSON object better. Flask view None return kare to error.
Test: Postman se GET/POST.
Parsing: request.get_json() body se, request.args query se.
40
Have you implemented REST APIs?

Times asked 1
Official solution

SimpleAPI = Application Programming Interface — do systems predefined rules se baat karti hain. REST API HTTP + JSON use karti hai.
Controller/route HTML bhi return kar sakta hai. REST API generally JSON return karti hai, frontend alag ho (Vue/Postman).
Example
```
@app.route('/api/users/<int:id>')
def get_user(id):
    u = User.query.get_or_404(id)
    return jsonify(id=u.id, name=u.name)
```
MAD1 HTML apps mein 'API' kabhi-kabhi routes ko hi keh dete hain. Agar Vue nahi to bolo: server-rendered Flask, JSON APIs optional.
Boolean return: technically jsonify(True) ho sakta hai, lekin meaningful JSON object better. Flask view None return kare to error.
Test: Postman se GET/POST.
Parsing: request.get_json() body se, request.args query se.
41

Explain HTTP methods.

Times asked 3

Official solution

SimpleHTTP methods batate hain request kya karna chahti hai. Common: GET POST PUT PATCH DELETE.
GETread/fetch. Safe, URL se. Page kholna, search.
POSTcreate/submit. Form, login.
PUTpoora replace/update. Idempotent.
PATCHpartial update.
DELETEhataana.
HEAD: sirf headers. OPTIONS: CORS preflight.
Flask: @app.route('/x', methods=['GET','POST'])
Agar methods na likho to default sirf GET.
HTML form native sirf GET/POST. PUT/DELETE JS/fetch ya hidden _method se.
GET se data fetch ho sakta hai, create nahi karna chahiye. POST se theoretically fetch ho sakta hai lekin cache/semantics galat.
DELETE fetch ke liye nahi. GET POST ka kaam officially nahi karta — side effects GET pe mat rakho.
42
Can GET be used to send/fetch data?

Times asked 1
Official solution

SimpleGET data mangta hai (read), POST data bhejta hai (create/submit).
GETURL mein dikhta hai, bookmark ho sakta hai, browser back/refresh safe hai, data URL query mein jaata hai. Search, page open, login form dikhana.
POSTbody mein data jaata hai, URL mein password nahi dikhta, refresh pe dubara submit ho sakta hai. Login, register, form save.
Example
# page dikhana
```
@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    # POST: form submit
    email = request.form.get('email')
    ...
```
GET se theoretically data bhej sakte ho (?q=flask), lekin create/update ke liye nahi use karna — data log/history mein save ho jaata hai, length limit hoti hai.
HTML form default GET hota hai; method='POST' likhna zaroori hai login/register pe.
43
Can POST be used to fetch data?

Times asked 1
Official solution

SimpleGET data mangta hai (read), POST data bhejta hai (create/submit).
GETURL mein dikhta hai, bookmark ho sakta hai, browser back/refresh safe hai, data URL query mein jaata hai. Search, page open, login form dikhana.
POSTbody mein data jaata hai, URL mein password nahi dikhta, refresh pe dubara submit ho sakta hai. Login, register, form save.
Example
# page dikhana
```
@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    # POST: form submit
    email = request.form.get('email')
    ...
```
GET se theoretically data bhej sakte ho (?q=flask), lekin create/update ke liye nahi use karna — data log/history mein save ho jaata hai, length limit hoti hai.
HTML form default GET hota hai; method='POST' likhna zaroori hai login/register pe.
44

Can DELETE be used to fetch data?

Times asked 1

Official solution

SimpleHTTP methods batate hain request kya karna chahti hai. Common: GET POST PUT PATCH DELETE.
GETread/fetch. Safe, URL se. Page kholna, search.
POSTcreate/submit. Form, login.
PUTpoora replace/update. Idempotent.
PATCHpartial update.
DELETEhataana.
HEAD: sirf headers. OPTIONS: CORS preflight.
Flask: @app.route('/x', methods=['GET','POST'])
Agar methods na likho to default sirf GET.
HTML form native sirf GET/POST. PUT/DELETE JS/fetch ya hidden _method se.
GET se data fetch ho sakta hai, create nahi karna chahiye. POST se theoretically fetch ho sakta hai lekin cache/semantics galat.
DELETE fetch ke liye nahi. GET POST ka kaam officially nahi karta — side effects GET pe mat rakho.
45

Is HTTP stateless or stateful? What is state?

Times asked 1

Official solution

SimpleHTTP stateless hai — har request independent, server previous request yaad nahi rakhta.
Isliye login ke baad bhi har request pe kaun ho yeh prove karna padta hai: cookie/session/JWT.
State = yaad rakhna (user_id, cart). HTTP khud nahi rakhta; Flask session iske upar layer hai.
Fayda: scale aasan, koi bhi server next request handle kar sake (sticky session ke bina, token use karke).
46

What frameworks/technologies have you used?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
47

Why did you choose Flask instead of Django?

Times asked 1

Official solution

SimpleFlask lightweight microframework, Django batteries-included.
Flask: kam rules, SQLAlchemy/Jinja khud jodte ho. MAD1 course isi pe hai, seekhna easy.
Django: admin, ORM, auth ready. Bada project jaldi, lekin opinionated.
Course requirement + flexibility ki wajah se Flask.
48

Difference between 2-Tier and 3-Tier Architecture.

Times asked 1

Official solution

Simple2-tier = client seedha database se baat karta hai. 3-tier = beech mein application server hota hai.
2-tier: UI + DB. Jaise desktop app directly SQLite. Simple, lekin security/scaling kam.
3-tier: Presentation (browser) → Application (Flask) → Data (SQLite/MySQL). MAD1 project yahi hai.
Examplebrowser HTML dikhata hai, Flask business logic (booking, auth), DB data store.
Fayda: DB expose nahi, logic central, scale alag-alag tiers pe kar sakte ho.
49
What is Jinja2?

Times asked 3
Official solution

SimpleJinja2 Flask ka template engine hai. HTML ke andar Python-jaisa data print/loop/if kar sakte ho.
Bina Jinja har user ke liye alag HTML file. Jinja se ek template + data.
```
{{ user.name }} print, {% for x in items %} loop, {% if %} condition, {% extends %} layout.
```
Example routereturn render_template('dash.html', treks=treks)
dash.html: {% for t in treks %}<li>{{ t.name }}</li>{% endfor %}
HTML files templates/ folder mein isliye kyunki Flask default wahan dhundhta hai. render_template Jinja ko run karta hai.
Boolean Jinja handle karta hai: {% if user.is_admin %}.
50
Why did you use Jinja2?

Times asked 2
Official solution

SimpleJinja2 Flask ka template engine hai. HTML ke andar Python-jaisa data print/loop/if kar sakte ho.
Bina Jinja har user ke liye alag HTML file. Jinja se ek template + data.
```
{{ user.name }} print, {% for x in items %} loop, {% if %} condition, {% extends %} layout.
```
Example routereturn render_template('dash.html', treks=treks)
dash.html: {% for t in treks %}<li>{{ t.name }}</li>{% endfor %}
HTML files templates/ folder mein isliye kyunki Flask default wahan dhundhta hai. render_template Jinja ko run karta hai.
Boolean Jinja handle karta hai: {% if user.is_admin %}.
51
Explain an Anchor (<a>) tag with GET/POST behavior.

Times asked 1
Official solution

SimpleGET data mangta hai (read), POST data bhejta hai (create/submit).
GETURL mein dikhta hai, bookmark ho sakta hai, browser back/refresh safe hai, data URL query mein jaata hai. Search, page open, login form dikhana.
POSTbody mein data jaata hai, URL mein password nahi dikhta, refresh pe dubara submit ho sakta hai. Login, register, form save.
Example
# page dikhana
```
@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    # POST: form submit
    email = request.form.get('email')
    ...
```
GET se theoretically data bhej sakte ho (?q=flask), lekin create/update ke liye nahi use karna — data log/history mein save ho jaata hai, length limit hoti hai.
HTML form default GET hota hai; method='POST' likhna zaroori hai login/register pe.
52

Difference between # and . selectors in CSS.

Times asked 1

Official solution

Simple# ID selector hai (ek unique element), . class selector hai (kai elements).
#login-btn { color: red; } → id='login-btn'
.btn { padding: 8px; } → class='btn'
ID page mein unique hona chahiye. Class reuse hoti hai — saare buttons .btn.
CSS specificity: ID > class > element. Isliye # wala style . wale ko haarata hai.
HTML: id JavaScript/getElementById ke liye, class styling groups ke liye.
53
What is the datatype of an SQLAlchemy query result? (e.g., x = Model.query.filter_by(...))

Times asked 1
Official solution

SimpleSQLAlchemy Python ka sabse popular ORM hai. MAD1 mein Flask-SQLAlchemy wrapper use hota hai.
db = SQLAlchemy(app)
```
class Book(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(80), nullable=False)

Operations: db.session.add(obj), .commit(), .delete(obj), Model.query.all(), .filter_by(), .get_or_404(id).
db.Model ek class hai (function nahi). db object engine + session + metadata hold karta hai.
```
SQLALCHEMY_TRACK_MODIFICATIONS=False extra signals band karta hai, performance warning hatati hai.
Simplenullable=False matlab column khali nahi. default seedha value. Query objects lazy hote hain jab tak .all/.first.
```
age = db.Column(db.Integer, nullable=True)  # optional
status = db.Column(db.String(20), default='pending')
```
__tablename__ = 'users' # table name override
User.query.all() → list of User. .first() → User ya None. .get_or_404(id) → User ya 404.
filter_by(...) Query object return karta hai, execute .all() pe. Type: BaseQuery / list after all().
db.func.count(User.id) aggregate. Empty table render: loop 0 baar, crash nahi agar code sahi.
54
Sort table data alphabetically.

Times asked 2
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
55
Sort table data alphabetically.

Times asked 2
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
56
Display table data in uppercase.

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
57

Change a row layout into a column layout.

Times asked 1

Official solution

Simpleexaminer UI tweak maangta hai — CSS class ya inline, instantly dikhao.
Button color: <button class='btn btn-success'> ya style='background:#22c55e;color:#fff'
Navbar: navbar-dark bg-success / style='background:yellow' / fixed-bottom se neeche.
Center: .wrap { display:flex; justify-content:center; align-items:center; min-height:100vh; }
text-align:center heading ke liye. Bootstrap: d-flex justify-content-center, mx-auto, text-center.
Hover: .btn:hover { opacity:0.8; transform:scale(1.02); }
Half width: class='col-6' ya width:50%. Row→column: flex-direction:column / col-12 stack.
Login card: card shadow p-4 mx-auto (max-width:400px).
Table header green: th { background:green; color:white; } Bold column: td:nth-child(2){font-weight:bold}
Box shadow: box-shadow: 4px 4px 12px rgba(0,0,0,.3);
Background image: body { background: url('/static/bg.jpg') center/cover; }
Reset button: <button type='reset'>Clear</button>
Move button: ms-auto / position / flex order.
Jinja dashboard heading: <h1>{{ user.name }}'s Dashboard</h1>
58
Create a page with input field(s) and a Submit button that displays the entered data on another page.

Times asked 1
Official solution

Yeh live UI/CSS change hai. Examiner jo element bole uski CSS turant badlo.
Bootstrap class badlo (btn-primary → btn-success, bg-dark → bg-warning) ya inline style='color:red; background:#eee'.
Center: d-flex justify-content-center text-center. Navbar neeche: navbar fixed-bottom.
Example
```
<button class='btn btn-success' style='background:#16a34a'>Book</button>
```
Pehle browser inspect karke class dhundo, phir template mein change karke refresh.
59
Create a route that accepts URL/form parameters and renders another page.

Times asked 1
Official solution

Yeh project-specific feature add/modify hai. 4 layers touch karo: model, route, template, validation.
1) Data chahiye to models.py mein column/relationship + DB update (ALTER / migrate / create_all).
2) Route: GET pe form/page, POST pe request.form se save, flash + redirect.
3) Template: input name=... Jinja se {{ obj.field }} display.
4) Rule: duplicate, range, role check backend pe.
Example naya field 'city':
```
user.city = db.Column(db.String(50))
user.city = request.form.get('city')
<input name='city'>  ...  {{ user.city }}
```
60
Create a page to add two numbers and display their sum.

Times asked 1
Official solution

SimpleURL parameters se numbers lo, calculate karke return/render.
```
@app.route('/sum/<int:a>/<int:b>')
def add(a, b):
    return f'Hello, sum is {a+b}'
```
Product: a*b. Square: n*n. Even/odd: 'even' if n%2==0 else 'odd'.
Form se: request.form.get('a', type=int). Background color even/odd:
color = 'green' if n%2==0 else 'red'
```
return render_template('page.html', color=color)
```
CSS: body { background: {{ color }}; }
61
Validate password length on the frontend.

Times asked 1
Official solution

SimpleValidation galat data rok ti hai — frontend turant, backend must.
Frontend: required, min='18', maxlength='8', pattern='(?=.*[A-Z]).{8,}'
Backend example:
```
pwd = request.form.get('password','')
if len(pwd) < 8 or not re.search(r'[A-Z]', pwd) or not re.search(r'[0-9]', pwd):
    flash('Weak password')
```
Haan, regex se password rules ho sakte hain.
Age 18-99, date >= today, slots <= 30 and > 0, confirm password == password, email '@' .
Duplicate username: User.query.filter_by(email=email).first() or unique=True catch IntegrityError.
Past date: if date < date.today(): reject. Negative slots: if slots < 0: reject; book pe available > 0 check.
62
Add backend validation requiring a special character in the password.

Times asked 1
Official solution

SimpleValidation galat data rok ti hai — frontend turant, backend must.
Frontend: required, min='18', maxlength='8', pattern='(?=.*[A-Z]).{8,}'
Backend example:
```
pwd = request.form.get('password','')
if len(pwd) < 8 or not re.search(r'[A-Z]', pwd) or not re.search(r'[0-9]', pwd):
    flash('Weak password')
```
Haan, regex se password rules ho sakte hain.
Age 18-99, date >= today, slots <= 30 and > 0, confirm password == password, email '@' .
Duplicate username: User.query.filter_by(email=email).first() or unique=True catch IntegrityError.
Past date: if date < date.today(): reject. Negative slots: if slots < 0: reject; book pe available > 0 check.
63
Check whether an email exists in the database and display the result.

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
64

Difference between DELETE and TRUNCATE.

Times asked 1

Official solution

SimpleDELETE rows hataata hai, TRUNCATE poori table empty karta hai, DROP table hi mita deta hai.
DELETE FROM user WHERE id=5; — specific rows, WHERE chal sakta hai, trigger/rollback possible.
TRUNCATE TABLE user; — saari rows, tez, identity reset, WHERE nahi.
DROP TABLE user; — table structure bhi gayi.
ORM: db.session.delete(obj) = DELETE. Table drop rarely Flask se.
65
Rate your own project on a scale of 1–10.

Times asked 1
Official solution

Simple2-3 honest improvements + 1 security + 1 UX.
Example
```
password hashing/CSRF tighter, Redis cache, tests, pagination, email verify, rate limit login, better mobile CSS.
```
Challenges: relationships/cascade, concurrent booking, Jinja inheritance.
Rate: 7-8/10 with reason — 10/10 arrogant, 3/10 confidence khatam.
Security extra: HTTPS, hashed passwords, CSRF, SQL injection (ORM), login attempts, file type check.

See reviews Level1_93 MAD1 Level 1

Jul 31, 2026

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1

Show your GitHub repository and collaborator.

Times asked 16

Official solution

SimpleGitHub repo public/private policy ke hisaab, MAD-1 collaborator add, commits dikhao.
Repo → Settings → Collaborators → instructor added.
Commits: git log / GitHub History — regular commits better, ek dum 1 commit suspicious.
README + report mein AI usage likha hona chahiye agar use kiya.
2

Confirm GitHub form submission.

Times asked 1

Official solution

SimpleGitHub repo public/private policy ke hisaab, MAD-1 collaborator add, commits dikhao.
Repo → Settings → Collaborators → instructor added.
Commits: git log / GitHub History — regular commits better, ek dum 1 commit suspicious.
README + report mein AI usage likha hona chahiye agar use kiya.
3

Download the project from the Viva Portal or perform checksum.

Times asked 5

Official solution

SimpleChecksum file ka hash (jaise SHA256) — file change hui ya nahi verify.
Portal pe submitted ZIP ka checksum diya hota hai. Local file ka hash nikaalo, match hona chahiye.
Linux: sha256sum project.zip
Mismatch = galat file / corrupt download. Examiner integrity check karta hai ki tumhari submitted copy hi run ho rahi hai.
4

Run the application.

Times asked 8

Official solution

SimpleExaminer submitted ZIP chahta hai, local extra changes nahi.
Portal se ZIP download → extract → venv → pip install -r requirements.txt → flask run / python app.py.
Checksum maange to hash match karke dikhao. Camera/OPPE setup unke instructions.
Linux/Mac: paths, gunicorn; Windows paths alag ho to relative paths use karo.
Do browsers: admin + user parallel demo impressive lagta hai.
5

Demonstrate the complete application.

Times asked 33

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
6

Show all core functionalities.

Times asked 5

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
7

Demonstrate Admin, User/Student, Company/Staff features.

Times asked 1

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
8

Create, update, and delete records (CRUD operations).

Times asked 1

Official solution

SimpleCRUD = Create, Read, Update, Delete — kisi bhi resource ke 4 basic operations.
Create: POST, db.session.add(new_user); commit() — register, add trek.
Read: GET, User.query.all() — dashboard list.
Update: POST/PUT, user.name = 'Ram'; commit() — edit profile.
DeletePOST/DELETE, db.session.delete(obj); commit().
REST mapping: POST create, GET read, PUT/PATCH update, DELETE delete.
Admin panel mein yeh 4 dikhana viva demo ka common task hai.
9

Show booking history, summary/dashboard, search, profile update, approval flow, etc.

Times asked 1

Official solution

Yeh feature demo hai. Account ready rakho, steps bol ke dikhao.
Role ke hisaab login → action (create/approve/book) → DB/UI pe result → edge case (fail when slots=0 / blacklisted).
Do browser windows: admin + user. Search/filter alag se dikhao.
Agar feature nahi hai to sach bolo aur 2 minute mein kaise add karoge (query + template) explain karo.
10
Explain any extra features.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
11
Explain booking/timestamp calculations.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
12
Explain how treatment details or other project-specific workflows are implemented.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
13

Demonstrate duplicate application prevention.

Times asked 1

Official solution

SimpleDuplicate/overbook rokne ke liye DB constraint + route check dono.
Pehle query: Booking.query.filter_by(user_id=uid, trek_id=tid).first()
Agar exists: flash('Already booked'); return
Slots: if trek.available <= 0: reject else trek.available -= 1; commit
Race condition: unique(user_id, trek_id) constraint — do tabs se double click pe bhi ek hi row.
Blacklist: login pe is_blacklisted check.
Active drive limit: if Company ke paas status=open drive hai to naya mat banne do.
14
Explain the project organization/architecture.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
15

Show the main Python file (app.py).

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
16

Show where the database is initialized.

Times asked 1

Official solution

Yeh feature demo hai. Account ready rakho, steps bol ke dikhao.
Role ke hisaab login → action (create/approve/book) → DB/UI pe result → edge case (fail when slots=0 / blacklisted).
Do browser windows: admin + user. Search/filter alag se dikhao.
Agar feature nahi hai to sach bolo aur 2 minute mein kaise add karoge (query + template) explain karo.
17

Explain routes/controllers.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
18

Explain a specific route.

Times asked 2

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
19
Explain imported modules and why they are used (e.g., request, url_for, session, flash, redirect).

Times asked 1
Official solution

Simpleurl_for sirf URL string banata hai, redirect us URL pe browser ko bhejta hai.
url_for('home') → '/home' (function name se URL nikalta hai)
redirect(url_for('home')) → browser ko /home pe le jaata hai
Example
```
return redirect(url_for('dashboard'))  # sahi
return redirect('/dashboard')         # hardcode, route change pe toot jaayega

Agar redirect se url_for hata do to khud path string dena padega: redirect('/dashboard').
Agar url_for('home') ko url_for('home_page') kar do aur home_page naam ka function nahi hai to BuildError aayega.
```
url_for ko function ka naam chahiye, URL path nahi.
SimpleFlask session request-across data store karta hai, generally signed cookie mein.
session['user_id'] = user.id
uid = session.get('user_id')
session.clear() # logout
Type: dictionary-like (SecureCookieSession). SECRET_KEY se sign — tamper detect.
Store kahan: default client cookie. Server-side Redis/filesystem bhi laga sakte ho.
Browser storage: cookies, localStorage, sessionStorage. Session cookie tab-close pe jaa sakti hai.
Remember-me: permanent session ya alag token cookie.
20
Explain where SQLAlchemy is initialized.

Times asked 1
Official solution

SimpleSQLAlchemy Python ka sabse popular ORM hai. MAD1 mein Flask-SQLAlchemy wrapper use hota hai.
db = SQLAlchemy(app)
```
class Book(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(80), nullable=False)

Operations: db.session.add(obj), .commit(), .delete(obj), Model.query.all(), .filter_by(), .get_or_404(id).
db.Model ek class hai (function nahi). db object engine + session + metadata hold karta hai.
```
SQLALCHEMY_TRACK_MODIFICATIONS=False extra signals band karta hai, performance warning hatati hai.
21
Explain where Flask is initialized.

Times asked 1
Official solution

Simpledb Flask-SQLAlchemy ka object hai. Models db.Model se inherit karti hain, tables db.create_all() se banti hain.
db = SQLAlchemy()
db.init_app(app) # factory pattern
```
with app.app_context():
    db.create_all()

db.Model SQLAlchemy declarative base (class). Columns se table schema.
```
db properties engine/session/metadata se aati hain, Flask app config (SQLALCHEMY_DATABASE_URI) se bind.
Admin user: create_all sirf tables; admin seed alag function mein (if not User.query.filter_by(role='admin').first(): ...).
Live schema change: Flask-Migrate/Alembic. create_all nayi tables add kare, existing columns alter nahi karta generally.
22
Explain code logic for a project-specific feature.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
23
What is ORM / SQLAlchemy?

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
24
Explain database schema.

Times asked 2
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
25
Explain any two database tables.

Times asked 1
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
26
Explain relationships between tables.

Times asked 3
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
27
Explain Primary Key and Foreign Key.

Times asked 3
Official solution

SimplePrimary Key row ki unique ID hai, Foreign Key doosri table ki Primary Key ko point karti hai.
Primary Key: unique + not null. Har table mein hota hai. Example: user.id = 5
Foreign Key: relationship banati hai. post.user_id = 5 matlab yeh post user 5 ki hai.
Example
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
```
FK Primary Key bhi ho sakti hai (1-to-1 profile table). FK unique ho to One-to-One, nahi to One-to-Many.
28
Explain backref.

Times asked 5
Official solution

Simplebackref relationship ki reverse side automatically bana deta hai.
```
class Post(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    user = db.relationship('User', backref='posts')
```
Ab post.user milta hai, aur user.posts bhi — Post model pe sirf ek line.
secondary Many-to-Many junction table ke liye: relationship(..., secondary=likes_table, backref='liked_by').
Explicit chahiye to back_populates use karo.
29
Explain lazy loading.

Times asked 3
Official solution

Simplelazy loading related objects tab load karta hai jab attribute access karte ho, pehle nahi.
```
user = User.query.get(1)  # posts query nahi
```
user.posts # ab query
lazy=True / 'select' default. lazy='joined' eager join. lazy='dynamic' query object.
uselist=False One-to-One (single object, list nahi). Hataoge to list mil sakti hai.
Frontend lazy loading images alag cheez hai (viewport mein aaye tab load).
30

What frameworks/technologies did you use?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
31
Explain any template.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
32
Where have you used Jinja?

Times asked 1
Official solution

SimpleJinja2 Flask ka template engine hai. HTML ke andar Python-jaisa data print/loop/if kar sakte ho.
Bina Jinja har user ke liye alag HTML file. Jinja se ek template + data.
```
{{ user.name }} print, {% for x in items %} loop, {% if %} condition, {% extends %} layout.
```
Example routereturn render_template('dash.html', treks=treks)
dash.html: {% for t in treks %}<li>{{ t.name }}</li>{% endfor %}
HTML files templates/ folder mein isliye kyunki Flask default wahan dhundhta hai. render_template Jinja ko run karta hai.
Boolean Jinja handle karta hai: {% if user.is_admin %}.
33
Have you used Template Inheritance? Where?

Times asked 1
Official solution

Simpleextends poora layout inherit karta hai, include chhota piece insert karta hai.
extends: child page base.html ka structure use karti hai, blocks override karti hai. Ek hi parent.
include: navbar.html / footer.html jahan chaho insert. Kai baar use ho sakta hai.
base.html:
```
{% block content %}{% endblock %}

home.html:
{% extends 'base.html' %}
{% block content %}<h1>Home</h1>{% endblock %}

{% include 'navbar.html' %}  → navbar har page pe
```
Fayda: header/footer ek jagah, change once — saari pages update. MAD1 mein almost har project use karta hai.
34

Explain get_or_404().

Times asked 1

Official solution

SimpleStatus code number batata hai request ka result.
200 OK — success, page/data mil gaya.
201 Created — POST se naya resource.
302/303 Found/See Other — redirect (login ke baad).
304 Not Modified — cache use karo.
400 Bad Request — galat input.
401 Unauthorized — login nahi (ironically authentication missing).
403 Forbidden — login hai, permission nahi.
404 Not Found — route/record nahi.
500 Internal Server Error — server crash (DB error, NoneType). debug=True pe traceback.
501 Not Implemented — method server nahi sambhalta.
abort(404) Flask mein. get_or_404(id) record na ho to 404.
User ID GET pe exist na kare to 404 return karo, 500 nahi.
35
Explain redirect().

Times asked 2
Official solution

Simpleredirect browser ko naya URL pe GET karne ko kehta hai (generally 302).
```
return redirect(url_for('dashboard'))
```
Login/register/delete ke baad use karo taaki refresh duplicate POST na kare.
Doosra page dikhana hai with new request — redirect. Same request pe HTML — render_template.
36

Explain session.

Times asked 1

Official solution

SimpleFlask session request-across data store karta hai, generally signed cookie mein.
session['user_id'] = user.id
uid = session.get('user_id')
session.clear() # logout
Type: dictionary-like (SecureCookieSession). SECRET_KEY se sign — tamper detect.
Store kahan: default client cookie. Server-side Redis/filesystem bhi laga sakte ho.
Browser storage: cookies, localStorage, sessionStorage. Session cookie tab-close pe jaa sakti hai.
Remember-me: permanent session ya alag token cookie.
37
Explain flash().

Times asked 1
Official solution

Simpleflash() ek baar dikhne wala message session mein store karta hai — 'Login successful'.
flash('Invalid password', 'danger')
Template
```
{% with messages = get_flashed_messages(with_categories=True) %}
```
JS se auto-hide bhi kar sakte ho.
SECRET_KEY chahiye kyunki flash session use karta hai.
38
Explain url_for().

Times asked 2
Official solution

Simpleurl_for Flask function/endpoint name se URL generate karta hai, hardcode path nahi.
```
url_for('home') → '/'
url_for('edit_user', id=5) → '/user/5/edit'
Templates: href="{{ url_for('login') }}"
```
Parameter: endpoint ka naam (function name), plus route variables.
Galat naam: BuildError. Route rename karo to url_for automatic naya path dega — yahi fayda hai.
39
Why do we use render_template()?

Times asked 1
Official solution

Simplerender_template HTML file ko Jinja se process karke browser ko bhejta hai. Backend data ko frontend se jodta hai.
```
return render_template('dashboard.html', user=user, treks=treks)
```
File templates/dashboard.html honi chahiye.
Keyword arguments template mein variables ban jaate hain: {{ user.name }}.
Route kuch return na kare to Flask error. Boolean return typical HTML view ke liye nahi — string/Response chahiye.
40

How does data move from frontend to backend?

Times asked 1

Official solution

SimpleFrontend user jo dekhta/click karta hai, Backend server logic + database.
Frontend: HTML, CSS, Bootstrap, Jinja templates, thoda JS. Browser pe chalta hai.
Backend: Flask routes, SQLAlchemy, session, validation. Python server pe.
Data flow: form POST → Flask request.form → DB save → render_template/redirect → HTML dikha.
MAD1 typical stack: Flask + Jinja + SQLAlchemy + SQLite + Bootstrap.
41

How does data move from backend to frontend?

Times asked 1

Official solution

Simple flow: Browser → Route (controller) → Model/DB → phir template (view) → Browser.
Submit example:
1) HTML form POST /register, name='email'
2) register() request.form.get('email')
3) User(email=...) ; db.session.add; commit
4) redirect dashboard
5) dashboard query + render_template
6) Jinja {{ user.email }} / {% for %}
GET search: /search?q=flask → request.args.get('q') → filter ilike → template list.
JSON API: jsonify, frontend fetch().
42

Are frontend and backend validations implemented?

Times asked 1

Official solution

SimpleFrontend user jo dekhta/click karta hai, Backend server logic + database.
Frontend: HTML, CSS, Bootstrap, Jinja templates, thoda JS. Browser pe chalta hai.
Backend: Flask routes, SQLAlchemy, session, validation. Python server pe.
Data flow: form POST → Flask request.form → DB save → render_template/redirect → HTML dikha.
MAD1 typical stack: Flask + Jinja + SQLAlchemy + SQLite + Bootstrap.
43
Write HTML <form> syntax.

Times asked 1
Official solution

SimpleForm user input server ko bhejti hai. Table rows/columns dikhati hai.
```
<form action="{{ url_for('register') }}" method='POST' enctype='multipart/form-data'>
  <input name='email' required>
  <button type='submit'>Go</button>
</form>
```
name attribute server pe key ban'ti hai: request.form['email']. id JS/CSS, value default/dikhta hua text.
action URL. method GET/POST. enctype file upload pe multipart.
required frontend empty submit rokta hai (backend phir bhi check).
```
<table><thead><tr><th>Name</th></tr></thead><tbody><tr><td>{{ u.name }}</td></tr></tbody></table>
```
th header, td data, tr row. Nested table: td ke andar table (avoid, messy).
method hataoge to GET, password URL mein — buri baat.
44

Explain how form submission works.

Times asked 1

Official solution

Simple flow: Browser → Route (controller) → Model/DB → phir template (view) → Browser.
Submit example:
1) HTML form POST /register, name='email'
2) register() request.form.get('email')
3) User(email=...) ; db.session.add; commit
4) redirect dashboard
5) dashboard query + render_template
6) Jinja {{ user.email }} / {% for %}
GET search: /search?q=flask → request.args.get('q') → filter ilike → template list.
JSON API: jsonify, frontend fetch().
45

Types of CSS (Inline, Internal, External).

Times asked 3

Official solution

SimpleCSS 3 tarikon se lagti hai, priority Inline > Internal > External (same specificity pe).
Inline: style='color:red' element pe. Highest priority, lekin reuse nahi. Debugging mushkil.
Internal: <style> tag HTML head mein. Us page tak limited.
External: style.css file. Large project ke liye best — ek jagah change, saari pages update.
Example same button pe teeno:
/* external */ .btn { color: blue; }
/* internal */ .btn { color: green; }
 <button class='btn' style='color:red'> → red jeetega
ID (#box) class (.btn) se strong, class element (button) se strong.
!important sabko override karta hai — avoid karo.
Large project: external CSS preferred.
46

CSS priority/order of execution.

Times asked 1

Official solution

SimpleCSS 3 tarikon se lagti hai, priority Inline > Internal > External (same specificity pe).
Inline: style='color:red' element pe. Highest priority, lekin reuse nahi. Debugging mushkil.
Internal: <style> tag HTML head mein. Us page tak limited.
External: style.css file. Large project ke liye best — ek jagah change, saari pages update.
Example same button pe teeno:
/* external */ .btn { color: blue; }
/* internal */ .btn { color: green; }
 <button class='btn' style='color:red'> → red jeetega
ID (#box) class (.btn) se strong, class element (button) se strong.
!important sabko override karta hai — avoid karo.
Large project: external CSS preferred.
47
Write a Jinja for loop.

Times asked 9
Official solution

Simple Jinja loop + if — examiner notepad mein likhwaata hai:
```
{% for t in treks %}
  <p>{{ t.name }} — {{ t.location }}</p>
{% else %}
  <p>No treks</p>
{% endfor %}

{% if user.role == 'admin' %}
  <button>Delete</button>
{% endif %}
```
List filter: {% if x > 10 %}{{ x }}{% endif %}
Length: {{ items|length }} Upper: {{ name|upper }}
Table: loop ke andar <tr><td>
48
Write a Jinja if-else statement.

Times asked 1
Official solution

Simple Jinja loop + if — examiner notepad mein likhwaata hai:
```
{% for t in treks %}
  <p>{{ t.name }} — {{ t.location }}</p>
{% else %}
  <p>No treks</p>
{% endfor %}

{% if user.role == 'admin' %}
  <button>Delete</button>
{% endif %}
```
List filter: {% if x > 10 %}{{ x }}{% endif %}
Length: {{ items|length }} Upper: {{ name|upper }}
Table: loop ke andar <tr><td>
49

Explain HTTP status/error codes (e.g., 500 Internal Server Error, 301, 303 See Other).

Times asked 1

Official solution

SimpleStatus code number batata hai request ka result.
200 OK — success, page/data mil gaya.
201 Created — POST se naya resource.
302/303 Found/See Other — redirect (login ke baad).
304 Not Modified — cache use karo.
400 Bad Request — galat input.
401 Unauthorized — login nahi (ironically authentication missing).
403 Forbidden — login hai, permission nahi.
404 Not Found — route/record nahi.
500 Internal Server Error — server crash (DB error, NoneType). debug=True pe traceback.
501 Not Implemented — method server nahi sambhalta.
abort(404) Flask mein. get_or_404(id) record na ho to 404.
User ID GET pe exist na kare to 404 return karo, 500 nahi.
50

What error code is returned for a database/server issue?

Times asked 1

Official solution

SimpleStatus code number batata hai request ka result.
200 OK — success, page/data mil gaya.
201 Created — POST se naya resource.
302/303 Found/See Other — redirect (login ke baad).
304 Not Modified — cache use karo.
400 Bad Request — galat input.
401 Unauthorized — login nahi (ironically authentication missing).
403 Forbidden — login hai, permission nahi.
404 Not Found — route/record nahi.
500 Internal Server Error — server crash (DB error, NoneType). debug=True pe traceback.
501 Not Implemented — method server nahi sambhalta.
abort(404) Flask mein. get_or_404(id) record na ho to 404.
User ID GET pe exist na kare to 404 return karo, 500 nahi.
51
Write a simple Flask route.

Times asked 3
Official solution

Simple Hello World — notepad mein yeh likh ke run karke dikhao:
```
from flask import Flask
app = Flask(__name__)
@app.route('/')
def home():
    return 'Hello World'
if __name__ == '__main__':
    app.run(debug=True)

Jinja version: return render_template('hello.html', name='Shubham')
```
hello.html: <h1>Hello {{ name }}</h1>
POST-only: @app.route('/x', methods=['POST'])
52
Write a route that returns Hello World.

Times asked 1
Official solution

Simple Hello World — notepad mein yeh likh ke run karke dikhao:
```
from flask import Flask
app = Flask(__name__)
@app.route('/')
def home():
    return 'Hello World'
if __name__ == '__main__':
    app.run(debug=True)

Jinja version: return render_template('hello.html', name='Shubham')
```
hello.html: <h1>Hello {{ name }}</h1>
POST-only: @app.route('/x', methods=['POST'])
53
Write a route that returns the square of a number.

Times asked 1
Official solution

SimpleURL parameters se numbers lo, calculate karke return/render.
```
@app.route('/sum/<int:a>/<int:b>')
def add(a, b):
    return f'Hello, sum is {a+b}'
```
Product: a*b. Square: n*n. Even/odd: 'even' if n%2==0 else 'odd'.
Form se: request.form.get('a', type=int). Background color even/odd:
color = 'green' if n%2==0 else 'red'
```
return render_template('page.html', color=color)
```
CSS: body { background: {{ color }}; }
54
Write a route with URL parameters (e.g., ID).

Times asked 1
Official solution

Simple<int:id> URL se integer nikalta hai. Alternatives: query string, POST form, slug string.
```
@app.route('/user/<int:id>')  # /user/5
@app.route('/user/<string:name>')
```
request.args.get('id') # /user?id=5
request.form.get('id') # hidden field
int converter galat 'abc' pe 404 — yeh protection hai.
55
Write a route that accepts input from an HTML form and displays it.

Times asked 1
Official solution

Patternfilter query → template/JSON. Examiner jo entity bole us class ka naam use karo.
```
@app.route('/admin/blacklisted')
def blacklisted():
    rows = User.query.filter_by(is_blacklisted=True).all()
    return render_template('list.html', rows=rows)

JSON: return jsonify([{'id': r.id, 'name': r.name} for r in rows])
ID se: User.query.get_or_404(id)
Do filters: .filter(Drive.approved==False, Drive.title=='Data Scientist')
```
Join example: students jinhone blacklisted company ke drive pe apply kiya — join Application-Drive-Company.
PUT@app.route('/x/<int:id>', methods=['PUT']) + request.get_json()
url param display: @app.route('/show/<int:id>') return render_template('show.html', id=id)
Form → next page: POST values render_template('out.html', **request.form)
Count: return str(User.query.filter_by(is_blacklisted=True).count())
56
Write a route that renders a list in a template using Jinja.

Times asked 1
Official solution

Patternfilter query → template/JSON. Examiner jo entity bole us class ka naam use karo.
```
@app.route('/admin/blacklisted')
def blacklisted():
    rows = User.query.filter_by(is_blacklisted=True).all()
    return render_template('list.html', rows=rows)

JSON: return jsonify([{'id': r.id, 'name': r.name} for r in rows])
ID se: User.query.get_or_404(id)
Do filters: .filter(Drive.approved==False, Drive.title=='Data Scientist')
```
Join example: students jinhone blacklisted company ke drive pe apply kiya — join Application-Drive-Company.
PUT@app.route('/x/<int:id>', methods=['PUT']) + request.get_json()
url param display: @app.route('/show/<int:id>') return render_template('show.html', id=id)
Form → next page: POST values render_template('out.html', **request.form)
Count: return str(User.query.filter_by(is_blacklisted=True).count())
57
Write a route that passes data to a template using render_template().

Times asked 1
Official solution

Simplerender_template HTML file ko Jinja se process karke browser ko bhejta hai. Backend data ko frontend se jodta hai.
```
return render_template('dashboard.html', user=user, treks=treks)
```
File templates/dashboard.html honi chahiye.
Keyword arguments template mein variables ban jaate hain: {{ user.name }}.
Route kuch return na kare to Flask error. Boolean return typical HTML view ke liye nahi — string/Response chahiye.
58
Change the page background/UI.

Times asked 1
Official solution

Yeh live UI/CSS change hai. Examiner jo element bole uski CSS turant badlo.
Bootstrap class badlo (btn-primary → btn-success, bg-dark → bg-warning) ya inline style='color:red; background:#eee'.
Center: d-flex justify-content-center text-center. Navbar neeche: navbar fixed-bottom.
Example
```
<button class='btn btn-success' style='background:#16a34a'>Book</button>
```
Pehle browser inspect karke class dhundo, phir template mein change karke refresh.
59
Write a route to retrieve a record from the database using an ID.

Times asked 1
Official solution

Patternfilter query → template/JSON. Examiner jo entity bole us class ka naam use karo.
```
@app.route('/admin/blacklisted')
def blacklisted():
    rows = User.query.filter_by(is_blacklisted=True).all()
    return render_template('list.html', rows=rows)

JSON: return jsonify([{'id': r.id, 'name': r.name} for r in rows])
ID se: User.query.get_or_404(id)
Do filters: .filter(Drive.approved==False, Drive.title=='Data Scientist')
```
Join example: students jinhone blacklisted company ke drive pe apply kiya — join Application-Drive-Company.
PUT@app.route('/x/<int:id>', methods=['PUT']) + request.get_json()
url param display: @app.route('/show/<int:id>') return render_template('show.html', id=id)
Form → next page: POST values render_template('out.html', **request.form)
Count: return str(User.query.filter_by(is_blacklisted=True).count())
60

How are User, Admin, Doctor/Staff roles separated in the application?

Times asked 1

Official solution

SimpleRBAC = Role-Based Access Control — permission role se (admin/staff/user), har user pe alag nahi.
user.role = 'admin'
if current_user.role != 'admin': abort(403)
Same login page, role ke hisaab dashboard. Multiple roles: roles table Many-to-Many, ya comma field (behtar normalized table).
Unapproved staff: is_approved flag, login pe check.
Flask-Security/UserMixin is_authenticated, is_active, get_id dete hain.
61

What is datetime used for?

Times asked 1

Official solution

Simple mix of small concepts examiners poochte hain:
Enum: fixed choices (status = pending/approved). Python Enum ya DB Enum column.
Lambda: one-line anonymous function. key=lambda x: x.name sort ke liye.
datetime: dates/times. timedelta(days=1) yesterday. default=datetime.utcnow.
os.getenv('SECRET_KEY') environment se config, hardcode nahi. .env alternative: actual OS env, config.py, vault.
HTML metadata: <meta charset>, <meta name='viewport'> — page ke baare mein, body content nahi.
HTTP metadata: headers (Content-Type, Set-Cookie).
Request payload: body data (JSON/form).
Namespace: naam collide na hon (Blueprint name, Python packages).
Plugins: extra packages (Flask-Login). Package vs module: package folder with __init__, module ek .py file.
62

Where is request used and why?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.

See reviews Level1_91 MAD1 Level 1

Jul 31, 2026

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1

Demonstrate the complete project.

Times asked 3

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
2

Explain your project configuration.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
3

What can be used instead of .env / python-dotenv for managing configuration?

Times asked 1

Official solution

SimpleConfig (SECRET_KEY, DB URI) code se bahar environment mein rakho.
os.getenv('SECRET_KEY') ya python-dotenv .env file load.
Alternative: real OS env, config.py classes (Dev/Prod), Docker secrets. .env gitignore karo.
Folder name change se .env path toot sakta hai — relative Path(__file__) use karo.
4

Explain the APIs (or routes) used in your project.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
5
Write basic Jinja code (e.g., loops, variables, or conditions).

Times asked 1
Official solution

Simple Jinja loop + if — examiner notepad mein likhwaata hai:
```
{% for t in treks %}
  <p>{{ t.name }} — {{ t.location }}</p>
{% else %}
  <p>No treks</p>
{% endfor %}

{% if user.role == 'admin' %}
  <button>Delete</button>
{% endif %}
```
List filter: {% if x > 10 %}{{ x }}{% endif %}
Length: {{ items|length }} Upper: {{ name|upper }}
Table: loop ke andar <tr><td>
6

Explain how you implemented charts (e.g., Chart.js integration and data flow).

Times asked 1

Official solution

Simple flow: Browser → Route (controller) → Model/DB → phir template (view) → Browser.
Submit example:
1) HTML form POST /register, name='email'
2) register() request.form.get('email')
3) User(email=...) ; db.session.add; commit
4) redirect dashboard
5) dashboard query + render_template
6) Jinja {{ user.email }} / {% for %}
GET search: /search?q=flask → request.args.get('q') → filter ilike → template list.
JSON API: jsonify, frontend fetch().

See reviews LEVEL1_viva14 MAD1 Level 1

Jul 31, 2026

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1

Show your GitHub repository.

Times asked 9

Official solution

SimpleGitHub repo public/private policy ke hisaab, MAD-1 collaborator add, commits dikhao.
Repo → Settings → Collaborators → instructor added.
Commits: git log / GitHub History — regular commits better, ek dum 1 commit suspicious.
README + report mein AI usage likha hona chahiye agar use kiya.
2

Verify GitHub collaborator access.

Times asked 3

Official solution

SimpleGitHub repo public/private policy ke hisaab, MAD-1 collaborator add, commits dikhao.
Repo → Settings → Collaborators → instructor added.
Commits: git log / GitHub History — regular commits better, ek dum 1 commit suspicious.
README + report mein AI usage likha hona chahiye agar use kiya.
3

Show the AI/LLM usage percentage.

Times asked 1

Official solution

SimpleSach bolo. AI se boilerplate/docs theek, logic samajh ke explain karo.
'Boilerplate aur CSS ke liye AI use kiya, models/routes khud design kiye. Report mein X% mention hai.'
Line-by-line nahi explain kar paoge to examiner pakad lega. Documentation: official Flask/SQLAlchemy + course lectures.
4

Download the project from the Viva Portal.

Times asked 7

Official solution

SimpleExaminer submitted ZIP chahta hai, local extra changes nahi.
Portal se ZIP download → extract → venv → pip install -r requirements.txt → flask run / python app.py.
Checksum maange to hash match karke dikhao. Camera/OPPE setup unke instructions.
Linux/Mac: paths, gunicorn; Windows paths alag ho to relative paths use karo.
Do browsers: admin + user parallel demo impressive lagta hai.
5

Run the application.

Times asked 8

Official solution

SimpleExaminer submitted ZIP chahta hai, local extra changes nahi.
Portal se ZIP download → extract → venv → pip install -r requirements.txt → flask run / python app.py.
Checksum maange to hash match karke dikhao. Camera/OPPE setup unke instructions.
Linux/Mac: paths, gunicorn; Windows paths alag ho to relative paths use karo.
Do browsers: admin + user parallel demo impressive lagta hai.
6

Demonstrate the complete application.

Times asked 33

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
7

Perform all CRUD operations.

Times asked 2

Official solution

SimpleCRUD = Create, Read, Update, Delete — kisi bhi resource ke 4 basic operations.
Create: POST, db.session.add(new_user); commit() — register, add trek.
Read: GET, User.query.all() — dashboard list.
Update: POST/PUT, user.name = 'Ram'; commit() — edit profile.
DeletePOST/DELETE, db.session.delete(obj); commit().
REST mapping: POST create, GET read, PUT/PATCH update, DELETE delete.
Admin panel mein yeh 4 dikhana viva demo ka common task hai.
8

Demonstrate all Admin, User/Student, and Company functionalities.

Times asked 1

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
9
Show the search functionality.

Times asked 1
Official solution

SimpleSearch box GET form, backend query filter, results template mein.
```
q = request.args.get('q', '').strip()
results = Doctor.query.filter(Doctor.name.ilike(f'%{q}%')).all() if q else []
return render_template('search.html', results=results, q=q)
```
Jinja: {{ results|length }} matches. Empty: 'No results'.
JS-only filter: saara data pehle load, client filter — chhote lists. Bada data: server search.
Search generally GET (shareable URL). Count: len(results) ya db.func.count.
10
Explain the booking/appointment logic.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
11

Explain how the booking cost is calculated.

Times asked 1

Official solution

SimpleCost generally rate × quantity/time, round up rules ke saath.
hours = max(1, math.ceil(total_minutes / 60)) # 10 min bhi 1 hour
cost = hours * lot.price_per_hour
Logic route/model method mein rakho, template mein sirf {{ booking.cost }}.
Viva: numbers ka example 90 min × ₹50 = ₹100 (ceil 2 hours) walkthrough karo.
12
Test edge cases (e.g., booking two appointments at the same time).

Times asked 1
Official solution

Yeh MAD-1 viva question tumhare project ke context se linked hai. Short answer is structure se do:
Pehle 1 line definition/purpose, phir tumhare project ka example, phir chhota code/flow.
Typical Flask flowBrowser request → @app.route controller → SQLAlchemy model/DB → Jinja template response.
Auth: session['user_id'] + role check. CRUD: add/commit, query.all, field update, delete.
Live change maange to: related model → route → template, phir browser refresh karke dikhao.
Example (generic create):
obj = Model(name=request.form.get('name'))
```
db.session.add(obj); db.session.commit()
return redirect(url_for('list_view'))
```
13
Show database models.

Times asked 1
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
14
Explain models.py.

Times asked 21
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
15
Explain the User model.

Times asked 1
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
16
Explain backref.

Times asked 5
Official solution

Simplebackref relationship ki reverse side automatically bana deta hai.
```
class Post(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    user = db.relationship('User', backref='posts')
```
Ab post.user milta hai, aur user.posts bhi — Post model pe sirf ek line.
secondary Many-to-Many junction table ke liye: relationship(..., secondary=likes_table, backref='liked_by').
Explicit chahiye to back_populates use karo.
17

Is the Admin user created automatically when the database is initialized?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
18

What is Cascade in DBMS?

Times asked 1

Official solution

SimpleCascade parent ke saath child pe automatic action (generally delete).
Company delete → uski drives bhi delete, warna orphan rows / FK error.
SQLAlchemy: db.relationship('Drive', cascade='all, delete-orphan', backref='company')
SQL: ForeignKey(..., ondelete='CASCADE')
Cascade sirf delete nahi: save-update, merge, refresh-expire, expunge, delete-orphan.
Cascade Update: parent PK change to child FK update (rare, PK mat badlo).
Parent delete jab children active hon: constraint error, ya cascade se children gayab, ya pehle children handle karo — design choice examiner poochta hai.
CSS cascading alag topic hai (styles inherit/override).
19

Explain a solution if duplicate applications should later be allowed despite a unique constraint.

Times asked 1

Official solution

SimpleDuplicate/overbook rokne ke liye DB constraint + route check dono.
Pehle query: Booking.query.filter_by(user_id=uid, trek_id=tid).first()
Agar exists: flash('Already booked'); return
Slots: if trek.available <= 0: reject else trek.available -= 1; commit
Race condition: unique(user_id, trek_id) constraint — do tabs se double click pe bhi ek hi row.
Blacklist: login pe is_blacklisted check.
Active drive limit: if Company ke paas status=open drive hai to naya mat banne do.
20
What is ORM?

Times asked 49
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
21
Why is ORM used? What are its advantages?

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
22

What is a Virtual Environment (venv)? Why do we use it?

Times asked 1

Official solution

Simplevenv isolated Python environment — project ke packages system Python se mix nahi hote.
python -m venv .venv
source .venv/bin/activate # Windows: .venv\Scripts\activate
pip install -r requirements.txt
Do projects alag Flask versions rakh sakte hain. Viva: pehle venv activate, phir flask run.
23

What frontend and backend frameworks have you used?

Times asked 2

Official solution

SimpleFrontend user jo dekhta/click karta hai, Backend server logic + database.
Frontend: HTML, CSS, Bootstrap, Jinja templates, thoda JS. Browser pe chalta hai.
Backend: Flask routes, SQLAlchemy, session, validation. Python server pe.
Data flow: form POST → Flask request.form → DB save → render_template/redirect → HTML dikha.
MAD1 typical stack: Flask + Jinja + SQLAlchemy + SQLite + Bootstrap.
24
Difference between frontend validation and backend validation (with examples).

Times asked 1
Official solution

SimpleFrontend validation UX ke liye, Backend validation security ke liye. Dono chahiye, backend zyada important hai.
Frontend: HTML required, minlength, JS/regex. User ko turant error dikhta hai. Bypass easy (DevTools / Postman).
Backend: Flask route mein checks. Asli security yahi hai. Hacker frontend skip karke POST bhej sakta hai.
Example frontend
```
<input type='number' min='18' max='99' required>
```
Example backend
```
age = int(request.form.get('age') or 0)
if age < 18 or age >= 100:
    flash('Invalid age')
    return redirect(url_for('register'))
```
Viva line'Frontend convenience hai, backend source of truth hai.'
25

Explain all HTTP request methods.

Times asked 3

Official solution

SimpleHTTP methods batate hain request kya karna chahti hai. Common: GET POST PUT PATCH DELETE.
GETread/fetch. Safe, URL se. Page kholna, search.
POSTcreate/submit. Form, login.
PUTpoora replace/update. Idempotent.
PATCHpartial update.
DELETEhataana.
HEAD: sirf headers. OPTIONS: CORS preflight.
Flask: @app.route('/x', methods=['GET','POST'])
Agar methods na likho to default sirf GET.
HTML form native sirf GET/POST. PUT/DELETE JS/fetch ya hidden _method se.
GET se data fetch ho sakta hai, create nahi karna chahiye. POST se theoretically fetch ho sakta hai lekin cache/semantics galat.
DELETE fetch ke liye nahi. GET POST ka kaam officially nahi karta — side effects GET pe mat rakho.
26

Difference between PUT and PATCH.

Times asked 7

Official solution

SimplePUT poori resource replace karta hai, PATCH sirf kuch fields update karta hai.
PUTfull update. Jo fields nahi bheji, woh empty/default ho sakti hain. Idempotent — same request 5 baar bhejo, result same.
PATCHpartial update. Sirf name change karna hai to sirf name bhejo, baaki fields same rehti hain.
ExampleUser {name: Ram, city: Delhi, age: 20}
PUT /user/1 {name: Shyam} → city/age lose ho sakte hain agar poora object nahi bheja.
PATCH /user/1 {name: Shyam} → sirf name Shyam, city Delhi, age 20 same.
MAD1 Flask forms mein aksar POST se update karte hain kyunki HTML form PUT/PATCH native support nahi karta. Theory mein farq yeh hai.
27

How do CRUD operations map to REST APIs?

Times asked 1

Official solution

SimpleCRUD = Create, Read, Update, Delete — kisi bhi resource ke 4 basic operations.
Create: POST, db.session.add(new_user); commit() — register, add trek.
Read: GET, User.query.all() — dashboard list.
Update: POST/PUT, user.name = 'Ram'; commit() — edit profile.
DeletePOST/DELETE, db.session.delete(obj); commit().
REST mapping: POST create, GET read, PUT/PATCH update, DELETE delete.
Admin panel mein yeh 4 dikhana viva demo ka common task hai.
28
What security features have you implemented?

Times asked 1
Official solution

SimplePassword DB mein plain text mat rakho — hash store karo jo reverse nahi hota.
```
from werkzeug.security import generate_password_hash, check_password_hash
user.password = generate_password_hash(request.form['password'])
check_password_hash(user.password, form_password)
```
Hashing ≠ encryption. Leak pe bhi original password nahi milta (easy passwords rainbow table se — isliye salt + strong hash).
Column String(200) kyunki hash lamba hota hai. unique=True password pe mat lagao.
29
What additional security measures would you add?

Times asked 1
Official solution

SimplePassword DB mein plain text mat rakho — hash store karo jo reverse nahi hota.
```
from werkzeug.security import generate_password_hash, check_password_hash
user.password = generate_password_hash(request.form['password'])
check_password_hash(user.password, form_password)
```
Hashing ≠ encryption. Leak pe bhi original password nahi milta (easy passwords rainbow table se — isliye salt + strong hash).
Column String(200) kyunki hash lamba hota hai. unique=True password pe mat lagao.
30

How would you improve SQL/database security?

Times asked 1

Official solution

SimpleSQL Injection user input ko SQL bana ke DB hack. ORM/parameterized queries se bachao.
Galat: f"SELECT * FROM user WHERE email='{email}'" # email = ' OR 1=1 --
Sahi: User.query.filter_by(email=email) # bound parameters
Raw: db.session.execute(text('SELECT * FROM user WHERE id=:id'), {'id': i})
Extra: least privilege DB user, input validate, error messages generic.
31

Add a column showing the total appointments handled by each doctor (excluding cancelled appointments).

Times asked 1

Official solution

Simple 4-step: Model → DB → Form → Route → Template. Yeh sabse common live-coding hai.
1) models.py: age = db.Column(db.Integer, nullable=True)
2) DB: SQLite viewer se column, ya DB delete karke create_all, ya ALTER TABLE user ADD COLUMN age INTEGER; production mein Flask-Migrate.
3) register.html: <input type='number' name='age' min='18' required>
4) route: user.age = request.form.get('age', type=int); commit
5) dashboard: {{ user.age }} admin table mein <td>{{ u.age }}</td>
Print terminal: print('AGE', request.form.get('age'))
Phone/city same pattern, String(20). Openings on Drive: integer column + form + create_drive route.
32
Display the total number of applications submitted by a student.

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
33

Disable the Apply button after a student has already applied.

Times asked 1

Official solution

SimpleDuplicate/overbook rokne ke liye DB constraint + route check dono.
Pehle query: Booking.query.filter_by(user_id=uid, trek_id=tid).first()
Agar exists: flash('Already booked'); return
Slots: if trek.available <= 0: reject else trek.available -= 1; commit
Race condition: unique(user_id, trek_id) constraint — do tabs se double click pe bhi ek hi row.
Blacklist: login pe is_blacklisted check.
Active drive limit: if Company ke paas status=open drive hai to naya mat banne do.
34
Display the student's name and department on the Student Dashboard.

Times asked 1
Official solution

Simplecurrent user object template ko do, Jinja se naam print.
```
@app.route('/staff/dashboard')
def staff_dash():
    staff = Staff.query.get(session['user_id'])
    return render_template('staff_dash.html', staff=staff)

<h2>Welcome, {{ staff.name }}</h2>
```
Flask-Login: {{ current_user.name }} — context_processor se har template mein user inject ho sakta hai.
Roll/dept extra fields same tarah pass karo.
35
Create a profile box on the Student Dashboard that: Redirects to the profile page. Appears at a specified location. Dynamically displays the student's name. Uses a specific color.

Times asked 1
Official solution

Yeh live UI/CSS change hai. Examiner jo element bole uski CSS turant badlo.
Bootstrap class badlo (btn-primary → btn-success, bg-dark → bg-warning) ya inline style='color:red; background:#eee'.
Center: d-flex justify-content-center text-center. Navbar neeche: navbar fixed-bottom.
Example
```
<button class='btn btn-success' style='background:#16a34a'>Book</button>
```
Pehle browser inspect karke class dhundo, phir template mein change karke refresh.
36
Suggest an additional template/page showing details of the user booking a parking slot.

Times asked 1
Official solution

Yeh MAD-1 viva question tumhare project ke context se linked hai. Short answer is structure se do:
Pehle 1 line definition/purpose, phir tumhare project ka example, phir chhota code/flow.
Typical Flask flowBrowser request → @app.route controller → SQLAlchemy model/DB → Jinja template response.
Auth: session['user_id'] + role check. CRUD: add/commit, query.all, field update, delete.
Live change maange to: related model → route → template, phir browser refresh karke dikhao.
Example (generic create):
obj = Model(name=request.form.get('name'))
```
db.session.add(obj); db.session.commit()
return redirect(url_for('list_view'))
```
37
Answer hypothetical scenarios based on your application design and implementation.

Times asked 1
Official solution

Yeh MAD-1 viva question tumhare project ke context se linked hai. Short answer is structure se do:
Pehle 1 line definition/purpose, phir tumhare project ka example, phir chhota code/flow.
Typical Flask flowBrowser request → @app.route controller → SQLAlchemy model/DB → Jinja template response.
Auth: session['user_id'] + role check. CRUD: add/commit, query.all, field update, delete.
Live change maange to: related model → route → template, phir browser refresh karke dikhao.
Example (generic create):
obj = Model(name=request.form.get('name'))
```
db.session.add(obj); db.session.commit()
return redirect(url_for('list_view'))
```

See reviews Level2_139 MAD1 Level 1

Jul 31, 2026

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1

Show your College ID.

Times asked 16

Official solution

SimpleCamera pe clearly IITM/college ID dikhao — naam photo match.
Pehle se ID haath mein rakho. Glare mat aane do. Examiner screenshot/verify karta hai. Iske baad GitHub + project run.
2

Download the submitted project from the Viva Portal.

Times asked 1

Official solution

SimpleExaminer submitted ZIP chahta hai, local extra changes nahi.
Portal se ZIP download → extract → venv → pip install -r requirements.txt → flask run / python app.py.
Checksum maange to hash match karke dikhao. Camera/OPPE setup unke instructions.
Linux/Mac: paths, gunicorn; Windows paths alag ho to relative paths use karo.
Do browsers: admin + user parallel demo impressive lagta hai.
3

Run the application.

Times asked 8

Official solution

SimpleExaminer submitted ZIP chahta hai, local extra changes nahi.
Portal se ZIP download → extract → venv → pip install -r requirements.txt → flask run / python app.py.
Checksum maange to hash match karke dikhao. Camera/OPPE setup unke instructions.
Linux/Mac: paths, gunicorn; Windows paths alag ho to relative paths use karo.
Do browsers: admin + user parallel demo impressive lagta hai.
4
Show models.py.

Times asked 2
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
5

Show the percentage of AI/LLM used in the project.

Times asked 1

Official solution

SimpleSach bolo. AI se boilerplate/docs theek, logic samajh ke explain karo.
'Boilerplate aur CSS ke liye AI use kiya, models/routes khud design kiye. Report mein X% mention hai.'
Line-by-line nahi explain kar paoge to examiner pakad lega. Documentation: official Flask/SQLAlchemy + course lectures.
6

Demonstrate the complete application.

Times asked 33

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
7

Show all core functionalities.

Times asked 5

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
8
Log in as Admin and: Create a new parking lot. Edit a parking lot. Reduce available spots to 0 and 1. View users. View summary charts. Logout.

Times asked 1
Official solution

SimpleLogin GET form dikhata hai, POST credentials check karke session set karta hai.
```
@app.route('/login', methods=['GET','POST'])
def login():
    if request.method == 'POST':
        u = User.query.filter_by(email=request.form.get('email')).first()
        if u and check_password_hash(u.password, request.form.get('password')):
            if getattr(u, 'blacklisted', False):
                flash('Blocked'); return redirect(url_for('login'))
            session['user_id'] = u.id
            session['role'] = u.role
            return redirect(url_for('dashboard'))
        flash('Invalid')
    return render_template('login.html')
```
Logout: session.clear(); redirect login. Incognito alag cookie jar — logged out dikhega.
Single login page: role se redirect alag dashboards.

Times asked 1

Official solution

SimpleLogin GET form dikhata hai, POST credentials check karke session set karta hai.

@app.route('/login', methods=['GET','POST'])
def login():
    if request.method == 'POST':
        u = User.query.filter_by(email=request.form.get('email')).first()
        if u and check_password_hash(u.password, request.form.get('password')):
            if getattr(u, 'blacklisted', False):
                flash('Blocked'); return redirect(url_for('login'))
            session['user_id'] = u.id
            session['role'] = u.role
            return redirect(url_for('dashboard'))
        flash('Invalid')
    return render_template('login.html')

Logout: session.clear(); redirect login. Incognito alag cookie jar — logged out dikhega.
Single login page: role se redirect alag dashboards.

10

Explain how the parking cost is calculated.

Times asked 1

Official solution

SimpleCost generally rate × quantity/time, round up rules ke saath.
hours = max(1, math.ceil(total_minutes / 60)) # 10 min bhi 1 hour
cost = hours * lot.price_per_hour
Logic route/model method mein rakho, template mein sirf {{ booking.cost }}.
Viva: numbers ka example 90 min × ₹50 = ₹100 (ceil 2 hours) walkthrough karo.
11
Difference between PUT and POST.

Times asked 6
Official solution

SimplePOST nayi cheez create karta hai, PUT existing cheez ko replace/update karta hai.
POST /books → naya book add. Har baar naya ID banega. Idempotent nahi — 2 baar POST = 2 records.
PUT /books/5 → id=5 wale book ko poora update. Same PUT dubara bhejo to same result (idempotent).
PUT se create bhi ho sakta hai (agar ID client decide kare), lekin REST convention: create = POST, replace = PUT, partial = PATCH.
Example
```
@app.route('/user', methods=['POST'])          # register naya user
@app.route('/user/<int:id>', methods=['PUT'])  # poora profile replace
```
HTML <form> PUT nahi bhejta, isliye Flask apps mein edit pe bhi POST use hota hai. Examiner ko yeh reason clearly bolo.
12
What is a Primary Key?

Times asked 5
Official solution

SimplePrimary Key har row ko uniquely identify karti hai. Unique Key bhi unique hoti hai lekin table ki main ID nahi.
```
id = db.Column(db.Integer, primary_key=True)  # auto increment
email = db.Column(db.String(120), unique=True)
```
PK: NOT NULL, ek (ya composite). Index automatically.
Record fetch: User.query.get(id) PK se tez.
FK hamesha unique nahi — Many side pe repeat hoti hai. Unique FK = One-to-One.
13
Write a Jinja for loop.

Times asked 9
Official solution

Simple Jinja loop + if — examiner notepad mein likhwaata hai:
```
{% for t in treks %}
  <p>{{ t.name }} — {{ t.location }}</p>
{% else %}
  <p>No treks</p>
{% endfor %}

{% if user.role == 'admin' %}
  <button>Delete</button>
{% endif %}
```
List filter: {% if x > 10 %}{{ x }}{% endif %}
Length: {{ items|length }} Upper: {{ name|upper }}
Table: loop ke andar <tr><td>
14
Write a query to fetch a specific user by User ID.

Times asked 1
Official solution

Patternfilter query → template/JSON. Examiner jo entity bole us class ka naam use karo.
```
@app.route('/admin/blacklisted')
def blacklisted():
    rows = User.query.filter_by(is_blacklisted=True).all()
    return render_template('list.html', rows=rows)

JSON: return jsonify([{'id': r.id, 'name': r.name} for r in rows])
ID se: User.query.get_or_404(id)
Do filters: .filter(Drive.approved==False, Drive.title=='Data Scientist')
```
Join example: students jinhone blacklisted company ke drive pe apply kiya — join Application-Drive-Company.
PUT@app.route('/x/<int:id>', methods=['PUT']) + request.get_json()
url param display: @app.route('/show/<int:id>') return render_template('show.html', id=id)
Form → next page: POST values render_template('out.html', **request.form)
Count: return str(User.query.filter_by(is_blacklisted=True).count())
15
Write a query to fetch all users.

Times asked 1
Official solution

Patternfilter query → template/JSON. Examiner jo entity bole us class ka naam use karo.
```
@app.route('/admin/blacklisted')
def blacklisted():
    rows = User.query.filter_by(is_blacklisted=True).all()
    return render_template('list.html', rows=rows)

JSON: return jsonify([{'id': r.id, 'name': r.name} for r in rows])
ID se: User.query.get_or_404(id)
Do filters: .filter(Drive.approved==False, Drive.title=='Data Scientist')
```
Join example: students jinhone blacklisted company ke drive pe apply kiya — join Application-Drive-Company.
PUT@app.route('/x/<int:id>', methods=['PUT']) + request.get_json()
url param display: @app.route('/show/<int:id>') return render_template('show.html', id=id)
Form → next page: POST values render_template('out.html', **request.form)
Count: return str(User.query.filter_by(is_blacklisted=True).count())
16
Write a query to fetch parking spots belonging to a specific Lot ID.

Times asked 1
Official solution

Patternfilter query → template/JSON. Examiner jo entity bole us class ka naam use karo.
```
@app.route('/admin/blacklisted')
def blacklisted():
    rows = User.query.filter_by(is_blacklisted=True).all()
    return render_template('list.html', rows=rows)

JSON: return jsonify([{'id': r.id, 'name': r.name} for r in rows])
ID se: User.query.get_or_404(id)
Do filters: .filter(Drive.approved==False, Drive.title=='Data Scientist')
```
Join example: students jinhone blacklisted company ke drive pe apply kiya — join Application-Drive-Company.
PUT@app.route('/x/<int:id>', methods=['PUT']) + request.get_json()
url param display: @app.route('/show/<int:id>') return render_template('show.html', id=id)
Form → next page: POST values render_template('out.html', **request.form)
Count: return str(User.query.filter_by(is_blacklisted=True).count())
17
Modify the application so the Admin dashboard displays the total number of users.

Times asked 1
Official solution

Yeh MAD-1 viva question tumhare project ke context se linked hai. Short answer is structure se do:
Pehle 1 line definition/purpose, phir tumhare project ka example, phir chhota code/flow.
Typical Flask flowBrowser request → @app.route controller → SQLAlchemy model/DB → Jinja template response.
Auth: session['user_id'] + role check. CRUD: add/commit, query.all, field update, delete.
Live change maange to: related model → route → template, phir browser refresh karke dikhao.
Example (generic create):
obj = Model(name=request.form.get('name'))
```
db.session.add(obj); db.session.commit()
return redirect(url_for('list_view'))
```

See reviews Level1_131 MAD1 Level 1

Jul 31, 2026

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1

Show your College ID.

Times asked 16

Official solution

SimpleCamera pe clearly IITM/college ID dikhao — naam photo match.
Pehle se ID haath mein rakho. Glare mat aane do. Examiner screenshot/verify karta hai. Iske baad GitHub + project run.
2

Download the project from the Viva Portal or perform checksum.

Times asked 5

Official solution

SimpleChecksum file ka hash (jaise SHA256) — file change hui ya nahi verify.
Portal pe submitted ZIP ka checksum diya hota hai. Local file ka hash nikaalo, match hona chahiye.
Linux: sha256sum project.zip
Mismatch = galat file / corrupt download. Examiner integrity check karta hai ki tumhari submitted copy hi run ho rahi hai.
3

Explain the complete project/folder structure.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
4

Explain the purpose of every file and how they are connected.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
5
Explain current_app.

Times asked 1
Official solution

SimpleApplication context app-level data (config, db), Request context ek HTTP request (request, session).
Request ke andar Flask khud context push karta hai. Scripts/shell mein db query ke liye:
```
with app.app_context():
    User.query.all()
```
app.app_context().push() same, lekin with better (cleanup).
current_app proxy current Flask app ki taraf. Factory pattern mein import app cycle avoid.
Request context ke bahar request.form error dega.
6
What is ORM?

Times asked 49
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
7
Have you used ORM? Why?

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
8

Explain the frontend, backend, and database architecture.

Times asked 1

Official solution

SimpleFrontend user jo dekhta/click karta hai, Backend server logic + database.
Frontend: HTML, CSS, Bootstrap, Jinja templates, thoda JS. Browser pe chalta hai.
Backend: Flask routes, SQLAlchemy, session, validation. Python server pe.
Data flow: form POST → Flask request.form → DB save → render_template/redirect → HTML dikha.
MAD1 typical stack: Flask + Jinja + SQLAlchemy + SQLite + Bootstrap.
9
Explain the complete workflow when a user registers.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
10

Explain the complete data flow for a feature (e.g., Add Doctor, Apply for Drive, Profile Update).

Times asked 1

Official solution

Simple flow: Browser → Route (controller) → Model/DB → phir template (view) → Browser.
Submit example:
1) HTML form POST /register, name='email'
2) register() request.form.get('email')
3) User(email=...) ; db.session.add; commit
4) redirect dashboard
5) dashboard query + render_template
6) Jinja {{ user.email }} / {% for %}
GET search: /search?q=flask → request.args.get('q') → filter ilike → template list.
JSON API: jsonify, frontend fetch().
11

Explain app.py.

Times asked 3

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
12
Explain models.py.

Times asked 21
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
13

Explain a specific route chosen by the proctor.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
14
Explain how a route with both GET and POST methods works.

Times asked 1
Official solution

SimpleGET data mangta hai (read), POST data bhejta hai (create/submit).
GETURL mein dikhta hai, bookmark ho sakta hai, browser back/refresh safe hai, data URL query mein jaata hai. Search, page open, login form dikhana.
POSTbody mein data jaata hai, URL mein password nahi dikhta, refresh pe dubara submit ho sakta hai. Login, register, form save.
Example
# page dikhana
```
@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    # POST: form submit
    email = request.form.get('email')
    ...
```
GET se theoretically data bhej sakte ho (?q=flask), lekin create/update ke liye nahi use karna — data log/history mein save ho jaata hai, length limit hoti hai.
HTML form default GET hota hai; method='POST' likhna zaroori hai login/register pe.
15

Explain endpoint routes such as '/delete/<int:id>'.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
16
Explain @app.template_filter.

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
17
Explain context_processor.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
18
Explain app_context.

Times asked 1
Official solution

SimpleApplication context app-level data (config, db), Request context ek HTTP request (request, session).
Request ke andar Flask khud context push karta hai. Scripts/shell mein db query ke liye:
```
with app.app_context():
    User.query.all()
```
app.app_context().push() same, lekin with better (cleanup).
current_app proxy current Flask app ki taraf. Factory pattern mein import app cycle avoid.
Request context ke bahar request.form error dega.
19
Explain all model relationships.

Times asked 1
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
20
Explain One-to-One, One-to-Many, and Many-to-Many relationships.

Times asked 1
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
21
Explain backref.

Times asked 5
Official solution

Simplebackref relationship ki reverse side automatically bana deta hai.
```
class Post(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    user = db.relationship('User', backref='posts')
```
Ab post.user milta hai, aur user.posts bhi — Post model pe sirf ek line.
secondary Many-to-Many junction table ke liye: relationship(..., secondary=likes_table, backref='liked_by').
Explicit chahiye to back_populates use karo.
22
Explain nullable.

Times asked 1
Official solution

Simplenullable=False matlab column khali nahi. default seedha value. Query objects lazy hote hain jab tak .all/.first.
```
age = db.Column(db.Integer, nullable=True)  # optional
status = db.Column(db.String(20), default='pending')
```
__tablename__ = 'users' # table name override
User.query.all() → list of User. .first() → User ya None. .get_or_404(id) → User ya 404.
filter_by(...) Query object return karta hai, execute .all() pe. Type: BaseQuery / list after all().
db.func.count(User.id) aggregate. Empty table render: loop 0 baar, crash nahi agar code sahi.
23
Explain Foreign Key.

Times asked 3
Official solution

SimpleForeign Key doosri table ki PK ko refer karti hai, relationship + referential integrity.
```
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
```
Invalid user_id insert nahi hoga. FK unique nahi hona zaroori — One-to-Many mein same user_id kai rows.
FK + PK same column: 1-1 sharing, jaise AdminProfile.id = FK to user.id.
Should FK always unique? Nahi. Tab One-to-One chahiye ho tab unique.
24
Explain Secondary (Junction) Tables.

Times asked 1
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
25
How do you add a new record using SQLAlchemy ORM?

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
26
Write an ORM query to insert a new record.

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
27
Update a record using a field other than the primary key.

Times asked 1
Official solution

SimplePrimary Key har row ko uniquely identify karti hai. Unique Key bhi unique hoti hai lekin table ki main ID nahi.
```
id = db.Column(db.Integer, primary_key=True)  # auto increment
email = db.Column(db.String(120), unique=True)
```
PK: NOT NULL, ek (ya composite). Index automatically.
Record fetch: User.query.get(id) PK se tez.
FK hamesha unique nahi — Many side pe repeat hoti hai. Unique FK = One-to-One.
28
Fetch a record using its Primary Key.

Times asked 1
Official solution

SimplePrimary Key har row ko uniquely identify karti hai. Unique Key bhi unique hoti hai lekin table ki main ID nahi.
```
id = db.Column(db.Integer, primary_key=True)  # auto increment
email = db.Column(db.String(120), unique=True)
```
PK: NOT NULL, ek (ya composite). Index automatically.
Record fetch: User.query.get(id) PK se tez.
FK hamesha unique nahi — Many side pe repeat hoti hai. Unique FK = One-to-One.
29
Fetch related data using relationships (without writing an explicit SQL query).

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
30
Write a SQL query to insert data.

Times asked 1
Official solution

Patternfilter query → template/JSON. Examiner jo entity bole us class ka naam use karo.
```
@app.route('/admin/blacklisted')
def blacklisted():
    rows = User.query.filter_by(is_blacklisted=True).all()
    return render_template('list.html', rows=rows)

JSON: return jsonify([{'id': r.id, 'name': r.name} for r in rows])
ID se: User.query.get_or_404(id)
Do filters: .filter(Drive.approved==False, Drive.title=='Data Scientist')
```
Join example: students jinhone blacklisted company ke drive pe apply kiya — join Application-Drive-Company.
PUT@app.route('/x/<int:id>', methods=['PUT']) + request.get_json()
url param display: @app.route('/show/<int:id>') return render_template('show.html', id=id)
Form → next page: POST values render_template('out.html', **request.form)
Count: return str(User.query.filter_by(is_blacklisted=True).count())
31
What is RegisterForm? Where is it defined?

Times asked 1
Official solution

SimpleUserMixin Flask-Login ko batata hai user object kaise treat karna hai (is_authenticated, get_id).
```
class User(db.Model, UserMixin):
    id = db.Column(db.Integer, primary_key=True)
```
current_user proxy logged-in user. Initialize: login_user(user) / user_loader callback.
Flask-WTF: Python classes se forms, CSRF, validators. RegisterForm forms.py mein.
fs_uniquifier Flask-Security mein token/session identity — email change pe sessions invalidate.
enctype='multipart/form-data' file upload pe zaroori. request.files.get('resume').
32
What is Flask-Migrate? Why did you use it?

Times asked 1
Official solution

SimpleFlask Python ka micro web framework hai — routes, templates, request/response handle karta hai.
```
from flask import Flask
app = Flask(__name__)
@app.route('/')
def home():
    return 'Hello'
app.run(debug=True)  # default port 5000
```
__name__ se Flask ko pata chalta hai templates/static kahan se load karni hai. Hataoge to resource paths toot sakte hain.
Faydesimple, flexible, MAD1 syllabus. Nuksaan: bade features (admin, auth) khud jodne padte hain.
```
app.run() development server start karta hai. Production mein gunicorn/waitress.
```
33
Why is SQLALCHEMY_TRACK_MODIFICATIONS=False used?

Times asked 1
Official solution

SimpleSQLAlchemy Python ka sabse popular ORM hai. MAD1 mein Flask-SQLAlchemy wrapper use hota hai.
db = SQLAlchemy(app)
```
class Book(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(80), nullable=False)

Operations: db.session.add(obj), .commit(), .delete(obj), Model.query.all(), .filter_by(), .get_or_404(id).
db.Model ek class hai (function nahi). db object engine + session + metadata hold karta hai.
```
SQLALCHEMY_TRACK_MODIFICATIONS=False extra signals band karta hai, performance warning hatati hai.
34
Explain debug=True.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
35
Explain if __name__ == "__main__".

Times asked 1
Official solution

Simpleapp = Flask(__name__) app banata hai; if __name__ == '__main__' tabhi server start jab file directly run ho.
```
app = Flask(__name__)
if __name__ == '__main__':
    app.run(debug=True, port=5000)
```
__name__ module ka naam. Direct run pe '__main__', import pe filename. Import karoge to server auto-start nahi — tests/blueprints ke liye zaroori.
debug=True: auto-reload + debugger. Production mein band rakho (security).
Port: app.run(port=8000) ya flask run --port 8000. Default 5000. Haan, change ho sakta hai.
36
Explain url_for().

Times asked 2
Official solution

Simpleurl_for Flask function/endpoint name se URL generate karta hai, hardcode path nahi.
```
url_for('home') → '/'
url_for('edit_user', id=5) → '/user/5/edit'
Templates: href="{{ url_for('login') }}"
```
Parameter: endpoint ka naam (function name), plus route variables.
Galat naam: BuildError. Route rename karo to url_for automatic naya path dega — yahi fayda hai.
37
Explain redirect().

Times asked 2
Official solution

Simpleredirect browser ko naya URL pe GET karne ko kehta hai (generally 302).
```
return redirect(url_for('dashboard'))
```
Login/register/delete ke baad use karo taaki refresh duplicate POST na kare.
Doosra page dikhana hai with new request — redirect. Same request pe HTML — render_template.
38
Explain render_template().

Times asked 1
Official solution

Simplerender_template HTML file ko Jinja se process karke browser ko bhejta hai. Backend data ko frontend se jodta hai.
```
return render_template('dashboard.html', user=user, treks=treks)
```
File templates/dashboard.html honi chahiye.
Keyword arguments template mein variables ban jaate hain: {{ user.name }}.
Route kuch return na kare to Flask error. Boolean return typical HTML view ke liye nahi — string/Response chahiye.
39
Match: redirect() → route render_template() → HTML template url_for() → endpoint/function name

Times asked 1
Official solution

Simplerender_template HTML page bana ke turant dikhata hai, redirect user ko doosre URL pe bhej deta hai.
render_template('home.html', user=user) → server template fill karke 200 response deta hai. URL same rehta hai.
redirect(url_for('dashboard')) → 302 response, browser naya GET karta hai. URL change ho jaata hai.
Examplelogin POST successful hone ke baad render_template mat use karo, warna refresh pe form dubara submit ho jaayega.
Sahi tarika: redirect(url_for('dashboard')) — yeh Post-Redirect-Get pattern hai.
render_template tab: page dikhana hai with data.
redirect tab: kaam ho gaya, ab doosre page pe le jaana hai (login, delete, update ke baad).
Simpleurl_for URL nikalta hai, render_template HTML page return karta hai. Dono alag kaam.
```
url_for('login') → '/login'
render_template('login.html') → login page ka HTML

Templates mein link ke liye: <a href="{{ url_for('dashboard') }}">Dashboard</a>
Route mein page dikhane ke liye: return render_template('dashboard.html', user=user)
```
url_for endpoint/function name leta hai, render_template HTML file name leta hai.
40
What parameter should be passed to url_for()?

Times asked 1
Official solution

Simpleurl_for Flask function/endpoint name se URL generate karta hai, hardcode path nahi.
```
url_for('home') → '/'
url_for('edit_user', id=5) → '/user/5/edit'
Templates: href="{{ url_for('login') }}"
```
Parameter: endpoint ka naam (function name), plus route variables.
Galat naam: BuildError. Route rename karo to url_for automatic naya path dega — yahi fayda hai.
41
Why do some routes use <int:id> while others don't?

Times asked 1
Official solution

Simple<int:id> URL se integer nikalta hai. Alternatives: query string, POST form, slug string.
```
@app.route('/user/<int:id>')  # /user/5
@app.route('/user/<string:name>')
```
request.args.get('id') # /user?id=5
request.form.get('id') # hidden field
int converter galat 'abc' pe 404 — yeh protection hai.
42
Alternative ways to pass data besides <int:id>.

Times asked 1
Official solution

Simple<int:id> URL se integer nikalta hai. Alternatives: query string, POST form, slug string.
```
@app.route('/user/<int:id>')  # /user/5
@app.route('/user/<string:name>')
```
request.args.get('id') # /user?id=5
request.form.get('id') # hidden field
int converter galat 'abc' pe 404 — yeh protection hai.
43

Explain all HTTP methods.

Times asked 2

Official solution

SimpleHTTP methods batate hain request kya karna chahti hai. Common: GET POST PUT PATCH DELETE.
GETread/fetch. Safe, URL se. Page kholna, search.
POSTcreate/submit. Form, login.
PUTpoora replace/update. Idempotent.
PATCHpartial update.
DELETEhataana.
HEAD: sirf headers. OPTIONS: CORS preflight.
Flask: @app.route('/x', methods=['GET','POST'])
Agar methods na likho to default sirf GET.
HTML form native sirf GET/POST. PUT/DELETE JS/fetch ya hidden _method se.
GET se data fetch ho sakta hai, create nahi karna chahiye. POST se theoretically fetch ho sakta hai lekin cache/semantics galat.
DELETE fetch ke liye nahi. GET POST ka kaam officially nahi karta — side effects GET pe mat rakho.
44
Difference between GET and POST.

Times asked 7
Official solution

SimpleGET data mangta hai (read), POST data bhejta hai (create/submit).
GETURL mein dikhta hai, bookmark ho sakta hai, browser back/refresh safe hai, data URL query mein jaata hai. Search, page open, login form dikhana.
POSTbody mein data jaata hai, URL mein password nahi dikhta, refresh pe dubara submit ho sakta hai. Login, register, form save.
Example
# page dikhana
```
@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    # POST: form submit
    email = request.form.get('email')
    ...
```
GET se theoretically data bhej sakte ho (?q=flask), lekin create/update ke liye nahi use karna — data log/history mein save ho jaata hai, length limit hoti hai.
HTML form default GET hota hai; method='POST' likhna zaroori hai login/register pe.
45

Can a form be submitted using PUT or DELETE?

Times asked 1

Official solution

SimpleHTTP methods batate hain request kya karna chahti hai. Common: GET POST PUT PATCH DELETE.
GETread/fetch. Safe, URL se. Page kholna, search.
POSTcreate/submit. Form, login.
PUTpoora replace/update. Idempotent.
PATCHpartial update.
DELETEhataana.
HEAD: sirf headers. OPTIONS: CORS preflight.
Flask: @app.route('/x', methods=['GET','POST'])
Agar methods na likho to default sirf GET.
HTML form native sirf GET/POST. PUT/DELETE JS/fetch ya hidden _method se.
GET se data fetch ho sakta hai, create nahi karna chahiye. POST se theoretically fetch ho sakta hai lekin cache/semantics galat.
DELETE fetch ke liye nahi. GET POST ka kaam officially nahi karta — side effects GET pe mat rakho.
46

What happens if a form uses the GET method?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
47

How is the POST method triggered?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
48
Can GET be used to create data?

Times asked 1
Official solution

SimpleGET data mangta hai (read), POST data bhejta hai (create/submit).
GETURL mein dikhta hai, bookmark ho sakta hai, browser back/refresh safe hai, data URL query mein jaata hai. Search, page open, login form dikhana.
POSTbody mein data jaata hai, URL mein password nahi dikhta, refresh pe dubara submit ho sakta hai. Login, register, form save.
Example
# page dikhana
```
@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    # POST: form submit
    email = request.form.get('email')
    ...
```
GET se theoretically data bhej sakte ho (?q=flask), lekin create/update ke liye nahi use karna — data log/history mein save ho jaata hai, length limit hoti hai.
HTML form default GET hota hai; method='POST' likhna zaroori hai login/register pe.
49
How do you retrieve query parameters?

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
50
Explain request.args.get().

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
51
Explain form action.

Times asked 1
Official solution

SimpleForm user input server ko bhejti hai. Table rows/columns dikhati hai.
```
<form action="{{ url_for('register') }}" method='POST' enctype='multipart/form-data'>
  <input name='email' required>
  <button type='submit'>Go</button>
</form>
```
name attribute server pe key ban'ti hai: request.form['email']. id JS/CSS, value default/dikhta hua text.
action URL. method GET/POST. enctype file upload pe multipart.
required frontend empty submit rokta hai (backend phir bhi check).
```
<table><thead><tr><th>Name</th></tr></thead><tbody><tr><td>{{ u.name }}</td></tr></tbody></table>
```
th header, td data, tr row. Nested table: td ke andar table (avoid, messy).
method hataoge to GET, password URL mein — buri baat.
52
Explain enctype.

Times asked 1
Official solution

SimpleForm user input server ko bhejti hai. Table rows/columns dikhati hai.
```
<form action="{{ url_for('register') }}" method='POST' enctype='multipart/form-data'>
  <input name='email' required>
  <button type='submit'>Go</button>
</form>
```
name attribute server pe key ban'ti hai: request.form['email']. id JS/CSS, value default/dikhta hua text.
action URL. method GET/POST. enctype file upload pe multipart.
required frontend empty submit rokta hai (backend phir bhi check).
```
<table><thead><tr><th>Name</th></tr></thead><tbody><tr><td>{{ u.name }}</td></tr></tbody></table>
```
th header, td data, tr row. Nested table: td ke andar table (avoid, messy).
method hataoge to GET, password URL mein — buri baat.
53
Difference between Authentication, Authorization, and Validation.

Times asked 1
Official solution

SimpleAuthentication poochta hai "tu kaun hai?", Authorization poochta hai "tujhe yeh kaam karne ki permission hai?"
Authentication: login. Username + password check karke prove karte ho ki tum genuine user ho. Success pe session/token milta hai.
Authorization: uske baad role check. Admin hi parking lot delete kar sakta hai, normal user nahi.
Example (Flask):
# Authentication
```
if user and check_password_hash(user.password, form_password):
    session['user_id'] = user.id

# Authorization
if session.get('role') != 'admin':
    abort(403)  # logged in ho, lekin allowed nahi
```
Project example: student login = authentication. Student admin dashboard nahi khol sakta = authorization.
Validation alag cheez hai (form sahi bhara hai ya nahi, jaise age 18+).
54
How do you protect routes so only logged-in users can access them?

Times asked 1
Official solution

Simple@login_required / custom decorator check karta hai session mein user hai ya nahi, nahi to login pe bhejta hai.
```
def login_required(f):
    @wraps(f)
    def wrapper(*a, **k):
        if 'user_id' not in session:
            return redirect(url_for('login'))
        return f(*a, **k)
    return wrapper

@app.before_request se bhi global check ho sakta hai.
```
Decorator order: pehle @app.route, uske neeche @login_required generally. Swap karoge to kabhi route register galat ho sakta hai — Flask-Login docs follow karo.
Role decorator @role_required('admin') authorization ke liye. Order matter karta hai: pehle auth, phir role.
55
What type of validation is pattern?

Times asked 1
Official solution

SimpleValidation galat data rok ti hai — frontend turant, backend must.
Frontend: required, min='18', maxlength='8', pattern='(?=.*[A-Z]).{8,}'
Backend example:
```
pwd = request.form.get('password','')
if len(pwd) < 8 or not re.search(r'[A-Z]', pwd) or not re.search(r'[0-9]', pwd):
    flash('Weak password')
```
Haan, regex se password rules ho sakte hain.
Age 18-99, date >= today, slots <= 30 and > 0, confirm password == password, email '@' .
Duplicate username: User.query.filter_by(email=email).first() or unique=True catch IntegrityError.
Past date: if date < date.today(): reject. Negative slots: if slots < 0: reject; book pe available > 0 check.
56
Explain minlength validation.

Times asked 1
Official solution

SimpleValidation galat data rok ti hai — frontend turant, backend must.
Frontend: required, min='18', maxlength='8', pattern='(?=.*[A-Z]).{8,}'
Backend example:
```
pwd = request.form.get('password','')
if len(pwd) < 8 or not re.search(r'[A-Z]', pwd) or not re.search(r'[0-9]', pwd):
    flash('Weak password')
```
Haan, regex se password rules ho sakte hain.
Age 18-99, date >= today, slots <= 30 and > 0, confirm password == password, email '@' .
Duplicate username: User.query.filter_by(email=email).first() or unique=True catch IntegrityError.
Past date: if date < date.today(): reject. Negative slots: if slots < 0: reject; book pe available > 0 check.
57
What is Template Inheritance?

Times asked 10
Official solution

Simpleextends poora layout inherit karta hai, include chhota piece insert karta hai.
extends: child page base.html ka structure use karti hai, blocks override karti hai. Ek hi parent.
include: navbar.html / footer.html jahan chaho insert. Kai baar use ho sakta hai.
base.html:
```
{% block content %}{% endblock %}

home.html:
{% extends 'base.html' %}
{% block content %}<h1>Home</h1>{% endblock %}

{% include 'navbar.html' %}  → navbar har page pe
```
Fayda: header/footer ek jagah, change once — saari pages update. MAD1 mein almost har project use karta hai.
58
Explain Jinja object access (e.g., reservation.spot.lot.name).

Times asked 1
Official solution

SimpleJinja2 Flask ka template engine hai. HTML ke andar Python-jaisa data print/loop/if kar sakte ho.
Bina Jinja har user ke liye alag HTML file. Jinja se ek template + data.
```
{{ user.name }} print, {% for x in items %} loop, {% if %} condition, {% extends %} layout.
```
Example routereturn render_template('dash.html', treks=treks)
dash.html: {% for t in treks %}<li>{{ t.name }}</li>{% endfor %}
HTML files templates/ folder mein isliye kyunki Flask default wahan dhundhta hai. render_template Jinja ko run karta hai.
Boolean Jinja handle karta hai: {% if user.is_admin %}.
59
Write a Jinja for loop.

Times asked 9
Official solution

Simple Jinja loop + if — examiner notepad mein likhwaata hai:
```
{% for t in treks %}
  <p>{{ t.name }} — {{ t.location }}</p>
{% else %}
  <p>No treks</p>
{% endfor %}

{% if user.role == 'admin' %}
  <button>Delete</button>
{% endif %}
```
List filter: {% if x > 10 %}{{ x }}{% endif %}
Length: {{ items|length }} Upper: {{ name|upper }}
Table: loop ke andar <tr><td>
60
Explain the name attribute in HTML forms.

Times asked 1
Official solution

SimpleForm user input server ko bhejti hai. Table rows/columns dikhati hai.
```
<form action="{{ url_for('register') }}" method='POST' enctype='multipart/form-data'>
  <input name='email' required>
  <button type='submit'>Go</button>
</form>
```
name attribute server pe key ban'ti hai: request.form['email']. id JS/CSS, value default/dikhta hua text.
action URL. method GET/POST. enctype file upload pe multipart.
required frontend empty submit rokta hai (backend phir bhi check).
```
<table><thead><tr><th>Name</th></tr></thead><tbody><tr><td>{{ u.name }}</td></tr></tbody></table>
```
th header, td data, tr row. Nested table: td ke andar table (avoid, messy).
method hataoge to GET, password URL mein — buri baat.
61
Difference between block and inline elements.

Times asked 1
Official solution

SimpleBlock poori line leta hai, Inline text ke saath baithta hai.
Block (div, p, h1, section): width 100%, next element neeche aata hai. Height/width/margin set kar sakte ho.
Inline (span, a, strong): sirf content jitni jagah. Width/height generally nahi chalti.
Inline-block: inline ki tarah baithta hai, lekin width/height milti hai.
Example
```
<div>Hello</div><div>World</div> do lines. <span>Hello</span> <span>World</span> ek line.
```
62
Difference between <tr>, <td>, and <th>.

Times asked 1
Official solution

SimpleForm user input server ko bhejti hai. Table rows/columns dikhati hai.
```
<form action="{{ url_for('register') }}" method='POST' enctype='multipart/form-data'>
  <input name='email' required>
  <button type='submit'>Go</button>
</form>
```
name attribute server pe key ban'ti hai: request.form['email']. id JS/CSS, value default/dikhta hua text.
action URL. method GET/POST. enctype file upload pe multipart.
required frontend empty submit rokta hai (backend phir bhi check).
```
<table><thead><tr><th>Name</th></tr></thead><tbody><tr><td>{{ u.name }}</td></tr></tbody></table>
```
th header, td data, tr row. Nested table: td ke andar table (avoid, messy).
method hataoge to GET, password URL mein — buri baat.
63

What is .parking-summary-card? What does the . selector represent?

Times asked 1

Official solution

Simple# ID selector hai (ek unique element), . class selector hai (kai elements).
#login-btn { color: red; } → id='login-btn'
.btn { padding: 8px; } → class='btn'
ID page mein unique hona chahiye. Class reuse hoti hai — saare buttons .btn.
CSS specificity: ID > class > element. Isliye # wala style . wale ko haarata hai.
HTML: id JavaScript/getElementById ke liye, class styling groups ke liye.
64

What is display: flex?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
65

How do you make a section occupy half the page width?

Times asked 1

Official solution

Simpleexaminer UI tweak maangta hai — CSS class ya inline, instantly dikhao.
Button color: <button class='btn btn-success'> ya style='background:#22c55e;color:#fff'
Navbar: navbar-dark bg-success / style='background:yellow' / fixed-bottom se neeche.
Center: .wrap { display:flex; justify-content:center; align-items:center; min-height:100vh; }
text-align:center heading ke liye. Bootstrap: d-flex justify-content-center, mx-auto, text-center.
Hover: .btn:hover { opacity:0.8; transform:scale(1.02); }
Half width: class='col-6' ya width:50%. Row→column: flex-direction:column / col-12 stack.
Login card: card shadow p-4 mx-auto (max-width:400px).
Table header green: th { background:green; color:white; } Bold column: td:nth-child(2){font-weight:bold}
Box shadow: box-shadow: 4px 4px 12px rgba(0,0,0,.3);
Background image: body { background: url('/static/bg.jpg') center/cover; }
Reset button: <button type='reset'>Clear</button>
Move button: ms-auto / position / flex order.
Jinja dashboard heading: <h1>{{ user.name }}'s Dashboard</h1>
66

How do you add a hover effect to a button?

Times asked 1

Official solution

Simpleexaminer UI tweak maangta hai — CSS class ya inline, instantly dikhao.
Button color: <button class='btn btn-success'> ya style='background:#22c55e;color:#fff'
Navbar: navbar-dark bg-success / style='background:yellow' / fixed-bottom se neeche.
Center: .wrap { display:flex; justify-content:center; align-items:center; min-height:100vh; }
text-align:center heading ke liye. Bootstrap: d-flex justify-content-center, mx-auto, text-center.
Hover: .btn:hover { opacity:0.8; transform:scale(1.02); }
Half width: class='col-6' ya width:50%. Row→column: flex-direction:column / col-12 stack.
Login card: card shadow p-4 mx-auto (max-width:400px).
Table header green: th { background:green; color:white; } Bold column: td:nth-child(2){font-weight:bold}
Box shadow: box-shadow: 4px 4px 12px rgba(0,0,0,.3);
Background image: body { background: url('/static/bg.jpg') center/cover; }
Reset button: <button type='reset'>Clear</button>
Move button: ms-auto / position / flex order.
Jinja dashboard heading: <h1>{{ user.name }}'s Dashboard</h1>
67

Align two different text elements using HTML/CSS.

Times asked 1

Official solution

Simpleexaminer UI tweak maangta hai — CSS class ya inline, instantly dikhao.
Button color: <button class='btn btn-success'> ya style='background:#22c55e;color:#fff'
Navbar: navbar-dark bg-success / style='background:yellow' / fixed-bottom se neeche.
Center: .wrap { display:flex; justify-content:center; align-items:center; min-height:100vh; }
text-align:center heading ke liye. Bootstrap: d-flex justify-content-center, mx-auto, text-center.
Hover: .btn:hover { opacity:0.8; transform:scale(1.02); }
Half width: class='col-6' ya width:50%. Row→column: flex-direction:column / col-12 stack.
Login card: card shadow p-4 mx-auto (max-width:400px).
Table header green: th { background:green; color:white; } Bold column: td:nth-child(2){font-weight:bold}
Box shadow: box-shadow: 4px 4px 12px rgba(0,0,0,.3);
Background image: body { background: url('/static/bg.jpg') center/cover; }
Reset button: <button type='reset'>Clear</button>
Move button: ms-auto / position / flex order.
Jinja dashboard heading: <h1>{{ user.name }}'s Dashboard</h1>
68

What JavaScript did you use?

Times asked 1

Official solution

SimpleJavaScript browser pe chalta hai — click, validation, Chart.js, Bootstrap modal.
Frameworks: Vue, React, Angular. MAD1 mein vanilla JS / Bootstrap JS kaafi.
Modal: popup overlay. Bootstrap: data-bs-toggle='modal' data-bs-target='#id'.
Flash hide: setTimeout se alert remove. Form submit confirm: onsubmit='return confirm(...)'.
Agar project mein JS kam hai to sach bolo, theory example do.
69
Explain your Chart.js implementation.

Times asked 1
Official solution

SimpleChart.js frontend library. Backend counts bhejta hai, JS graph banata hai.
stats = {'booked': 10, 'cancelled': 2}
```
render_template('summary.html', stats=stats)
new Chart(ctx, {type:'bar', data:{labels:[...], datasets:[{data:[...]}]}})
```
Dynamic: har load pe query. Pie vs bar: Chart type change. Colors: backgroundColor array.
Swap graphs: HTML do canvas ki jagah badlo.
70

What is the DOM?

Times asked 3

Official solution

SimpleDOM = Document Object Model — HTML ka tree jo browser memory mein banata hai. JS isi ko change karta hai.
document.getElementById('btn').style.color = 'red'
Jinja server pe HTML banata hai, phir browser DOM parse karta hai. Vue DOM ko reactive update karta hai.
71

What is Version Control?

Times asked 2

Official solution

SimpleVCS history track karta hai, Git ek distributed VCS hai.
VCS: kaun kab kya change kiya, rollback, branches. Example: Git, SVN.
Git distributed: har developer ke paas poori copy (commits) hoti hai. Central GitHub sirf remote hosting hai, lekin Git ka model distributed hai.
SVN centralized: bina server ke history nahi.
Commands: git status (kya dirty hai), git branch / git checkout -b feature (nayi branch), git rm --cached file (track band, file rahe).
Fayda: collaboration, backup, experiment branches, viva GitHub collaborator check.
Git ke bina bhi files rakh sakte ho, lekin history/merge nahi.
72

Which Version Control tool did you use?

Times asked 1

Official solution

SimpleVCS history track karta hai, Git ek distributed VCS hai.
VCS: kaun kab kya change kiya, rollback, branches. Example: Git, SVN.
Git distributed: har developer ke paas poori copy (commits) hoti hai. Central GitHub sirf remote hosting hai, lekin Git ka model distributed hai.
SVN centralized: bina server ke history nahi.
Commands: git status (kya dirty hai), git branch / git checkout -b feature (nayi branch), git rm --cached file (track band, file rahe).
Fayda: collaboration, backup, experiment branches, viva GitHub collaborator check.
Git ke bina bhi files rakh sakte ho, lekin history/merge nahi.
73

What does git status do?

Times asked 1

Official solution

SimpleGit files ki history rakhta hai. GitHub remote + collaborator viva check.
git status — kya change/untracked
git checkout -b viva-fix ya git switch -c viva-fix — nayi branch
git rm --cached notes.txt — track band, file disk pe rahe (.gitignore)
git log — commits (examiner poochta hai)
Collaborator: repo → Settings → Collaborators. MAD-1 instructor add karna mandatory hota hai.
74

Git command to create a new branch.

Times asked 1

Official solution

SimpleGit files ki history rakhta hai. GitHub remote + collaborator viva check.
git status — kya change/untracked
git checkout -b viva-fix ya git switch -c viva-fix — nayi branch
git rm --cached notes.txt — track band, file disk pe rahe (.gitignore)
git log — commits (examiner poochta hai)
Collaborator: repo → Settings → Collaborators. MAD-1 instructor add karna mandatory hota hai.
75

Explain basic Git commands.

Times asked 1

Official solution

SimpleGit files ki history rakhta hai. GitHub remote + collaborator viva check.
git status — kya change/untracked
git checkout -b viva-fix ya git switch -c viva-fix — nayi branch
git rm --cached notes.txt — track band, file disk pe rahe (.gitignore)
git log — commits (examiner poochta hai)
Collaborator: repo → Settings → Collaborators. MAD-1 instructor add karna mandatory hota hai.
76
Explain how resume/file upload is handled.

Times asked 1
Official solution

SimpleFile upload form multipart, Flask request.files, disk ya DB path store.
```
<form method='POST' enctype='multipart/form-data'>
f = request.files.get('resume')
f.save(os.path.join('uploads', secure_filename(f.filename)))
```
Sensitive docs uploads/ web se seedha serve mat karo, login check ke baad send_from_directory.
Student resume edit: policy — allowed hai to Update route, nahi to freeze after apply.
77
Why did you use request.files.get()?

Times asked 1
Official solution

SimpleFile upload form multipart, Flask request.files, disk ya DB path store.
```
<form method='POST' enctype='multipart/form-data'>
f = request.files.get('resume')
f.save(os.path.join('uploads', secure_filename(f.filename)))
```
Sensitive docs uploads/ web se seedha serve mat karo, login check ke baad send_from_directory.
Student resume edit: policy — allowed hai to Update route, nahi to freeze after apply.
78
Create a route and HTML form that accepts user input and displays it on the browser.

Times asked 1
Official solution

Yeh project-specific feature add/modify hai. 4 layers touch karo: model, route, template, validation.
1) Data chahiye to models.py mein column/relationship + DB update (ALTER / migrate / create_all).
2) Route: GET pe form/page, POST pe request.form se save, flash + redirect.
3) Template: input name=... Jinja se {{ obj.field }} display.
4) Rule: duplicate, range, role check backend pe.
Example naya field 'city':
```
user.city = db.Column(db.String(50))
user.city = request.form.get('city')
<input name='city'>  ...  {{ user.city }}
```
79
Create a route that stores form input in the database.

Times asked 1
Official solution

Yeh project-specific feature add/modify hai. 4 layers touch karo: model, route, template, validation.
1) Data chahiye to models.py mein column/relationship + DB update (ALTER / migrate / create_all).
2) Route: GET pe form/page, POST pe request.form se save, flash + redirect.
3) Template: input name=... Jinja se {{ obj.field }} display.
4) Rule: duplicate, range, role check backend pe.
Example naya field 'city':
```
user.city = db.Column(db.String(50))
user.city = request.form.get('city')
<input name='city'>  ...  {{ user.city }}
```
80
Create a route with URL parameters (e.g., /sum/<a>/<b> or /course/<course_name>).

Times asked 1
Official solution

SimpleURL parameters se numbers lo, calculate karke return/render.
```
@app.route('/sum/<int:a>/<int:b>')
def add(a, b):
    return f'Hello, sum is {a+b}'
```
Product: a*b. Square: n*n. Even/odd: 'even' if n%2==0 else 'odd'.
Form se: request.form.get('a', type=int). Background color even/odd:
color = 'green' if n%2==0 else 'red'
```
return render_template('page.html', color=color)
```
CSS: body { background: {{ color }}; }
Simple<int:id> URL se integer nikalta hai. Alternatives: query string, POST form, slug string.
```
@app.route('/user/<int:id>')  # /user/5
@app.route('/user/<string:name>')
```
request.args.get('id') # /user?id=5
request.form.get('id') # hidden field
int converter galat 'abc' pe 404 — yeh protection hai.
81
Retrieve a student's applications using ORM relationships.

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
82
Retrieve a company by its ID.

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
83
Retrieve a student by ID.

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
84
Display student details and applications in a table.

Times asked 1
Official solution

Yeh list filter/sort/display task hai. Query badlo, template same rakh sakte ho.
```
rows = Model.query.filter_by(status='approved').order_by(Model.name.asc()).all()
```
Jinja: {% for r in rows %}<tr><td>{{ r.name|upper }}</td></tr>{% endfor %}
```
{{ rows|length }} count dikhane ke liye.
```
Alphabet sort: order_by(Model.name). Status filter: filter_by(status='pending').
Assigned staff column: relationship se {{ booking.staff.name }}.
85
Create a One-to-One relationship in code.

Times asked 1
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
86
Insert a new Admin/User using ORM.

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
87
Add a parking spot using ORM.

Times asked 1
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
88
Change the Admin Dashboard cards from row layout to column layout.

Times asked 1
Official solution

Yeh live UI/CSS change hai. Examiner jo element bole uski CSS turant badlo.
Bootstrap class badlo (btn-primary → btn-success, bg-dark → bg-warning) ya inline style='color:red; background:#eee'.
Center: d-flex justify-content-center text-center. Navbar neeche: navbar fixed-bottom.
Example
```
<button class='btn btn-success' style='background:#16a34a'>Book</button>
```
Pehle browser inspect karke class dhundo, phir template mein change karke refresh.
89
Print list elements greater than a given value using a Jinja loop.

Times asked 1
Official solution

Yeh MAD-1 viva question tumhare project ke context se linked hai. Short answer is structure se do:
Pehle 1 line definition/purpose, phir tumhare project ka example, phir chhota code/flow.
Typical Flask flowBrowser request → @app.route controller → SQLAlchemy model/DB → Jinja template response.
Auth: session['user_id'] + role check. CRUD: add/commit, query.all, field update, delete.
Live change maange to: related model → route → template, phir browser refresh karke dikhao.
Example (generic create):
obj = Model(name=request.form.get('name'))
```
db.session.add(obj); db.session.commit()
return redirect(url_for('list_view'))
```
90
Explain the complete flow of the code you wrote during the coding task.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
91

Did you implement a search feature? Explain its frontend and backend.

Times asked 1

Official solution

SimpleFrontend user jo dekhta/click karta hai, Backend server logic + database.
Frontend: HTML, CSS, Bootstrap, Jinja templates, thoda JS. Browser pe chalta hai.
Backend: Flask routes, SQLAlchemy, session, validation. Python server pe.
Data flow: form POST → Flask request.form → DB save → render_template/redirect → HTML dikha.
MAD1 typical stack: Flask + Jinja + SQLAlchemy + SQLite + Bootstrap.
92

What resources or documentation did you use while building the project?

Times asked 1

Official solution

Definition style question: 1 line simple Hinglish + project example + mini code.
Template'X ka kaam Y hai. Mere project mein Z jagah use hua.'
Example'Session login state rakhta hai. session[user_id]=u.id login pe, logout pe session.clear().'
Agar topic Vue/Celery/Redis ho aur project mein nahi hai to sach bolo, theory example do.
93

What is your area of interest outside this degree?

Times asked 1

Official solution

Simple20-30 second intro, phir ID nikaal ke rakhna.
Example'Namaste, main <Name> hoon, IITM BS degree, MAD-1 project <ProjectName> — Flask, SQLAlchemy, Jinja. Roles: Admin, Staff, User. CRUD, auth, search implement kiye.'
Interest poochhe to ek genuine cheez (ML, web, cricket) + 1 line. Fake buzzwords mat maaro.
End mein feedback maangna theek hai: 'Koi improvement suggest karenge?'

See reviews Level1_133 MAD1 Level 1

Jul 30, 2026

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1

Show your College ID.

Times asked 16

Official solution

SimpleCamera pe clearly IITM/college ID dikhao — naam photo match.
Pehle se ID haath mein rakho. Glare mat aane do. Examiner screenshot/verify karta hai. Iske baad GitHub + project run.
2

Show your GitHub repository.

Times asked 9

Official solution

SimpleGitHub repo public/private policy ke hisaab, MAD-1 collaborator add, commits dikhao.
Repo → Settings → Collaborators → instructor added.
Commits: git log / GitHub History — regular commits better, ek dum 1 commit suspicious.
README + report mein AI usage likha hona chahiye agar use kiya.
3

Download the project from the Viva Portal.

Times asked 7

Official solution

SimpleExaminer submitted ZIP chahta hai, local extra changes nahi.
Portal se ZIP download → extract → venv → pip install -r requirements.txt → flask run / python app.py.
Checksum maange to hash match karke dikhao. Camera/OPPE setup unke instructions.
Linux/Mac: paths, gunicorn; Windows paths alag ho to relative paths use karo.
Do browsers: admin + user parallel demo impressive lagta hai.
4

Run checksum.

Times asked 3

Official solution

SimpleChecksum file ka hash (jaise SHA256) — file change hui ya nahi verify.
Portal pe submitted ZIP ka checksum diya hota hai. Local file ka hash nikaalo, match hona chahiye.
Linux: sha256sum project.zip
Mismatch = galat file / corrupt download. Examiner integrity check karta hai ki tumhari submitted copy hi run ho rahi hai.
5

Demonstrate the application (the proctor may stop you midway and ask specific scenarios).

Times asked 1

Official solution

SimpleDemo script pehle se practice karo, 5-7 minute, saari roles.
Suggested flow
1) Register/login user 2) Admin login — CRUD 3) Approval/blacklist 4) Booking/apply 5) Search 6) Validation edge (slots 0, duplicate) 7) Logout
Bolte-bolte dikhao: 'Yahan overbooking rokta hoon'. Code tab kholna jab poochhein.
Crash ho to debug calmly: terminal error, typo, DB path.
Mandatory features skip mat karna — examiner list tick karta hai.
6
Create sample entities (e.g., student, company, drive, upload CV).

Times asked 1
Official solution

Yeh project-specific feature add/modify hai. 4 layers touch karo: model, route, template, validation.
1) Data chahiye to models.py mein column/relationship + DB update (ALTER / migrate / create_all).
2) Route: GET pe form/page, POST pe request.form se save, flash + redirect.
3) Template: input name=... Jinja se {{ obj.field }} display.
4) Rule: duplicate, range, role check backend pe.
Example naya field 'city':
```
user.city = db.Column(db.String(50))
user.city = request.form.get('city')
<input name='city'>  ...  {{ user.city }}
```
7
Explain the Student Dashboard workflow.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
8

Explain the Company CRUD workflow.

Times asked 1

Official solution

SimpleCRUD = Create, Read, Update, Delete — kisi bhi resource ke 4 basic operations.
Create: POST, db.session.add(new_user); commit() — register, add trek.
Read: GET, User.query.all() — dashboard list.
Update: POST/PUT, user.name = 'Ram'; commit() — edit profile.
DeletePOST/DELETE, db.session.delete(obj); commit().
REST mapping: POST create, GET read, PUT/PATCH update, DELETE delete.
Admin panel mein yeh 4 dikhana viva demo ka common task hai.
9
Explain additional features beyond the basic requirements.

Times asked 1
Official solution

Simple2-3 honest improvements + 1 security + 1 UX.
Example
```
password hashing/CSRF tighter, Redis cache, tests, pagination, email verify, rate limit login, better mobile CSS.
```
Challenges: relationships/cascade, concurrent booking, Jinja inheritance.
Rate: 7-8/10 with reason — 10/10 arrogant, 3/10 confidence khatam.
Security extra: HTTPS, hashed passwords, CSRF, SQL injection (ORM), login attempts, file type check.

Identify and explain any flaw noticed by the proctor (e.g., logout functionality).

Times asked 1

Official solution

SimpleLogin GET form dikhata hai, POST credentials check karke session set karta hai.

@app.route('/login', methods=['GET','POST'])
def login():
    if request.method == 'POST':
        u = User.query.filter_by(email=request.form.get('email')).first()
        if u and check_password_hash(u.password, request.form.get('password')):
            if getattr(u, 'blacklisted', False):
                flash('Blocked'); return redirect(url_for('login'))
            session['user_id'] = u.id
            session['role'] = u.role
            return redirect(url_for('dashboard'))
        flash('Invalid')
    return render_template('login.html')

Logout: session.clear(); redirect login. Incognito alag cookie jar — logged out dikhega.
Single login page: role se redirect alag dashboards.

11

Explain MVC and show where it is implemented in your code.

Times asked 1

Official solution

SimpleMVC = Model-View-Controller. Code ko 3 hisson mein baant ta hai taaki mix na ho.
Model: data + DB. models.py — User, Trek, Booking classes.
View: jo user dekhta hai. templates/*.html + Jinja.
Controller: beech ka logic. routes / app.py — request lo, model se data, view ko do.
Example flow (register):
Browser form POST → Controller register() → User model save → redirect → View dashboard.html
Draw: Browser → Controller → Model → DB, phir Controller → View → Browser.
ORM na ho to bhi MVC ho sakta hai — Model raw SQL functions ho sakte hain. Structure matter karta hai, library nahi.
MVP/MVVM doosri architectures hain; MAD1 mein MVC expected hai.
12

Explain the complete request flow after login (Browser → Controller/Route → Database → Response → View).

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
13

Explain how Controller and View interact during operations such as registration.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
Simple flow: Browser → Route (controller) → Model/DB → phir template (view) → Browser.
Submit example:
1) HTML form POST /register, name='email'
2) register() request.form.get('email')
3) User(email=...) ; db.session.add; commit
4) redirect dashboard
5) dashboard query + render_template
6) Jinja {{ user.email }} / {% for %}
GET search: /search?q=flask → request.args.get('q') → filter ilike → template list.
JSON API: jsonify, frontend fetch().
14

Explain one complete route from your project (e.g., student applying for a drive).

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
15

Explain routing and the purpose of different route handlers.

Times asked 1

Official solution

SimpleRoutes/controllers URLs handle karte hain. app.py app banata hai, models.py data, templates/ views, static/ CSS-JS.
Typical structure:
app.py / __init__.py → Flask app, db.init, register blueprints
models.py → tables
routes.py / views → @app.route functions
templates/ → Jinja HTML
static/ → css, images
instance/*.db → SQLite
Ek route explain karne ka template:
1) URL + methods 2) Auth/role check 3) Form/query se data 4) Business rule (duplicate, slots) 5) db.session 6) render ya redirect
Example GET+POST same route: GET form, POST save.
Data HTML se: form name= → request.form. Data HTML ko: render_template(..., items=query).
Nayi .py file: import karke use karo, warna Flask ko pata nahi. Folder rename: imports/paths/templates check.
16
Explain different parts of your code when the proctor points to them.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.
17
Explain models.py.

Times asked 21
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
18
Explain the database schema.

Times asked 2
Official solution

Simplemodels.py har table ki class hai — columns, PK/FK, relationships. Yeh Model layer hai.
Viva mein file khol ke bolo:
1) Kaunsi classes/tables hain (User, Role-specific, Booking...)
2) Har table ka kaam 1 line
3) Relationships: 1-1 / 1-M / M-M, backref, cascade, lazy
4) Constraints: unique email, nullable, default status
Example skeleton
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)
    role = db.Column(db.String(20), default='user')
    bookings = db.relationship('Booking', backref='user', cascade='all, delete-orphan')
```
ER diagram: rectangles entities, lines relationships, PK/FK mark. Schema = yahi structure.
Tables create: db.create_all() ya migrations. SQLite file SQL viewer se dikha sakte ho.
19
Explain relationships between tables.

Times asked 3
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
20
Explain Primary/Foreign Keys.

Times asked 1
Official solution

SimpleForeign Key doosri table ki PK ko refer karti hai, relationship + referential integrity.
```
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
```
Invalid user_id insert nahi hoga. FK unique nahi hona zaroori — One-to-Many mein same user_id kai rows.
FK + PK same column: 1-1 sharing, jaise AdminProfile.id = FK to user.id.
Should FK always unique? Nahi. Tab One-to-One chahiye ho tab unique.
21
Explain One-to-One and One-to-Many relationships and how they are identified.

Times asked 1
Official solution

SimpleRelationships tables ko jodti hain taaki related data object se mil jaaye.
One-to-Many: User → kai Posts. posts = relationship('Post', backref='author'). FK post.user_id.
One-to-One: User → Profile. uselist=False + unique FK. Profile.user_id unique.
Many-to-Many: Student ↔ Drive. Junction/secondary table (student_id, drive_id).
Example 1-1:
```
class Profile(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), unique=True)
    user = db.relationship('User', back_populates='profile', uselist=False)
```
1-M ko 1-1: child FK pe unique=True + uselist=False.
Parent-child: parent PK, child FK. Junction table extra columns bhi rakh sakti hai (applied_on).
22
What is ORM? Why is it used?

Times asked 2
Official solution

SimpleORM = Object Relational Mapping. Database tables ko Python classes/objects se map karta hai, raw SQL kam likhni padti hai.
Bina ORM: cursor.execute('SELECT * FROM user WHERE id=?', [5])
ORM se: User.query.get(5) ya db.session.get(User, 5)
Example model
```
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True)
```
FaydePython mein soch sakte ho, SQL injection se protection (parameterized), relationships easy, DB switch thoda aasan.
Nuksaancomplex queries slow/abstract, seekhne ki layer extra, kabhi raw SQL phir bhi chahiye.
MAD1: SQLAlchemy (Flask-SQLAlchemy). Tables db.create_all() ya migrations se banti hain.
23
Have you heard of MySQLAlchemy?

Times asked 1
Official solution

SimpleSQLAlchemy Python ka sabse popular ORM hai. MAD1 mein Flask-SQLAlchemy wrapper use hota hai.
db = SQLAlchemy(app)
```
class Book(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(80), nullable=False)

Operations: db.session.add(obj), .commit(), .delete(obj), Model.query.all(), .filter_by(), .get_or_404(id).
db.Model ek class hai (function nahi). db object engine + session + metadata hold karta hai.
```
SQLALCHEMY_TRACK_MODIFICATIONS=False extra signals band karta hai, performance warning hatati hai.
24
What is Lazy Loading?

Times asked 3
Official solution

Simplelazy loading related objects tab load karta hai jab attribute access karte ho, pehle nahi.
```
user = User.query.get(1)  # posts query nahi
```
user.posts # ab query
lazy=True / 'select' default. lazy='joined' eager join. lazy='dynamic' query object.
uselist=False One-to-One (single object, list nahi). Hataoge to list mil sakti hai.
Frontend lazy loading images alag cheez hai (viewport mein aaye tab load).
25
What is backref?

Times asked 12
Official solution

Simplebackref relationship ki reverse side automatically bana deta hai.
```
class Post(db.Model):
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    user = db.relationship('User', backref='posts')
```
Ab post.user milta hai, aur user.posts bhi — Post model pe sirf ek line.
secondary Many-to-Many junction table ke liye: relationship(..., secondary=likes_table, backref='liked_by').
Explicit chahiye to back_populates use karo.
26

What is Cascade Delete?

Times asked 2

Official solution

SimpleCascade parent ke saath child pe automatic action (generally delete).
Company delete → uski drives bhi delete, warna orphan rows / FK error.
SQLAlchemy: db.relationship('Drive', cascade='all, delete-orphan', backref='company')
SQL: ForeignKey(..., ondelete='CASCADE')
Cascade sirf delete nahi: save-update, merge, refresh-expire, expunge, delete-orphan.
Cascade Update: parent PK change to child FK update (rare, PK mat badlo).
Parent delete jab children active hon: constraint error, ya cascade se children gayab, ya pehle children handle karo — design choice examiner poochta hai.
CSS cascading alag topic hai (styles inherit/override).
27

What is Cascade Update?

Times asked 1

Official solution

SimpleCascade parent ke saath child pe automatic action (generally delete).
Company delete → uski drives bhi delete, warna orphan rows / FK error.
SQLAlchemy: db.relationship('Drive', cascade='all, delete-orphan', backref='company')
SQL: ForeignKey(..., ondelete='CASCADE')
Cascade sirf delete nahi: save-update, merge, refresh-expire, expunge, delete-orphan.
Cascade Update: parent PK change to child FK update (rare, PK mat badlo).
Parent delete jab children active hon: constraint error, ya cascade se children gayab, ya pehle children handle karo — design choice examiner poochta hai.
CSS cascading alag topic hai (styles inherit/override).
28

What are other Cascade operations/rules?

Times asked 1

Official solution

SimpleCascade parent ke saath child pe automatic action (generally delete).
Company delete → uski drives bhi delete, warna orphan rows / FK error.
SQLAlchemy: db.relationship('Drive', cascade='all, delete-orphan', backref='company')
SQL: ForeignKey(..., ondelete='CASCADE')
Cascade sirf delete nahi: save-update, merge, refresh-expire, expunge, delete-orphan.
Cascade Update: parent PK change to child FK update (rare, PK mat badlo).
Parent delete jab children active hon: constraint error, ya cascade se children gayab, ya pehle children handle karo — design choice examiner poochta hai.
CSS cascading alag topic hai (styles inherit/override).
29

How would you delete one application without affecting other related records?

Times asked 1

Official solution

Yeh feature demo hai. Account ready rakho, steps bol ke dikhao.
Role ke hisaab login → action (create/approve/book) → DB/UI pe result → edge case (fail when slots=0 / blacklisted).
Do browser windows: admin + user. Search/filter alag se dikhao.
Agar feature nahi hai to sach bolo aur 2 minute mein kaise add karoge (query + template) explain karo.
30
Difference between Authentication and Authorization.

Times asked 20
Official solution

SimpleAuthentication poochta hai "tu kaun hai?", Authorization poochta hai "tujhe yeh kaam karne ki permission hai?"
Authentication: login. Username + password check karke prove karte ho ki tum genuine user ho. Success pe session/token milta hai.
Authorization: uske baad role check. Admin hi parking lot delete kar sakta hai, normal user nahi.
Example (Flask):
# Authentication
```
if user and check_password_hash(user.password, form_password):
    session['user_id'] = user.id

# Authorization
if session.get('role') != 'admin':
    abort(403)  # logged in ho, lekin allowed nahi
```
Project example: student login = authentication. Student admin dashboard nahi khol sakta = authorization.
Validation alag cheez hai (form sahi bhara hai ya nahi, jaise age 18+).
31
What is Password Hashing?

Times asked 1
Official solution

SimplePassword DB mein plain text mat rakho — hash store karo jo reverse nahi hota.
```
from werkzeug.security import generate_password_hash, check_password_hash
user.password = generate_password_hash(request.form['password'])
check_password_hash(user.password, form_password)
```
Hashing ≠ encryption. Leak pe bhi original password nahi milta (easy passwords rainbow table se — isliye salt + strong hash).
Column String(200) kyunki hash lamba hota hai. unique=True password pe mat lagao.
32
How did you implement Password Hashing?

Times asked 1
Official solution

SimplePassword DB mein plain text mat rakho — hash store karo jo reverse nahi hota.
```
from werkzeug.security import generate_password_hash, check_password_hash
user.password = generate_password_hash(request.form['password'])
check_password_hash(user.password, form_password)
```
Hashing ≠ encryption. Leak pe bhi original password nahi milta (easy passwords rainbow table se — isliye salt + strong hash).
Column String(200) kyunki hash lamba hota hai. unique=True password pe mat lagao.
33

Explain all HTTP request methods.

Times asked 3

Official solution

SimpleHTTP methods batate hain request kya karna chahti hai. Common: GET POST PUT PATCH DELETE.
GETread/fetch. Safe, URL se. Page kholna, search.
POSTcreate/submit. Form, login.
PUTpoora replace/update. Idempotent.
PATCHpartial update.
DELETEhataana.
HEAD: sirf headers. OPTIONS: CORS preflight.
Flask: @app.route('/x', methods=['GET','POST'])
Agar methods na likho to default sirf GET.
HTML form native sirf GET/POST. PUT/DELETE JS/fetch ya hidden _method se.
GET se data fetch ho sakta hai, create nahi karna chahiye. POST se theoretically fetch ho sakta hai lekin cache/semantics galat.
DELETE fetch ke liye nahi. GET POST ka kaam officially nahi karta — side effects GET pe mat rakho.
34

Difference between GET, POST, and PUT.

Times asked 1

Official solution

SimpleGET read karta hai, PUT existing resource replace/update karta hai.
GET /users/1 → data lao, side-effect nahi. PUT /users/1 → poora user update, idempotent.
PUT vs FETCH: FETCH HTTP method nahi, JS fetch() function hai jo GET/PUT/POST kuch bhi bhej sakta hai.
Search GET, edit-save PUT/POST. GET se create mat karo.
35
What is Jinja?

Times asked 4
Official solution

SimpleJinja2 Flask ka template engine hai. HTML ke andar Python-jaisa data print/loop/if kar sakte ho.
Bina Jinja har user ke liye alag HTML file. Jinja se ek template + data.
```
{{ user.name }} print, {% for x in items %} loop, {% if %} condition, {% extends %} layout.
```
Example routereturn render_template('dash.html', treks=treks)
dash.html: {% for t in treks %}<li>{{ t.name }}</li>{% endfor %}
HTML files templates/ folder mein isliye kyunki Flask default wahan dhundhta hai. render_template Jinja ko run karta hai.
Boolean Jinja handle karta hai: {% if user.is_admin %}.
36
What is Template Inheritance?

Times asked 10
Official solution

Simpleextends poora layout inherit karta hai, include chhota piece insert karta hai.
extends: child page base.html ka structure use karti hai, blocks override karti hai. Ek hi parent.
include: navbar.html / footer.html jahan chaho insert. Kai baar use ho sakta hai.
base.html:
```
{% block content %}{% endblock %}

home.html:
{% extends 'base.html' %}
{% block content %}<h1>Home</h1>{% endblock %}

{% include 'navbar.html' %}  → navbar har page pe
```
Fayda: header/footer ek jagah, change once — saari pages update. MAD1 mein almost har project use karta hai.
37
Have you used a REST API?

Times asked 1
Official solution

SimpleAPI = Application Programming Interface — do systems predefined rules se baat karti hain. REST API HTTP + JSON use karti hai.
Controller/route HTML bhi return kar sakta hai. REST API generally JSON return karti hai, frontend alag ho (Vue/Postman).
Example
```
@app.route('/api/users/<int:id>')
def get_user(id):
    u = User.query.get_or_404(id)
    return jsonify(id=u.id, name=u.name)
```
MAD1 HTML apps mein 'API' kabhi-kabhi routes ko hi keh dete hain. Agar Vue nahi to bolo: server-rendered Flask, JSON APIs optional.
Boolean return: technically jsonify(True) ho sakta hai, lekin meaningful JSON object better. Flask view None return kare to error.
Test: Postman se GET/POST.
Parsing: request.get_json() body se, request.args query se.
38
If a database error occurs, how would you handle it? (Exception Handling)

Times asked 1
Official solution

SimpleException error object. try-except se app crash ki jagah friendly message.
```
try:
    age = int(request.form['age'])
    db.session.commit()
except ValueError:
    flash('Age number hona chahiye')
except SQLAlchemyError:
    db.session.rollback()
    flash('Database error')
```
ArithmeticError/ZeroDivisionError, KeyError, TypeError common. SQLAlchemy type errors: sahi Column type, form ko int() se convert.
User ko 500 ka traceback mat dikhao production mein.
39
Display the student's name on the Student Dashboard.

Times asked 1
Official solution

Simplecurrent user object template ko do, Jinja se naam print.
```
@app.route('/staff/dashboard')
def staff_dash():
    staff = Staff.query.get(session['user_id'])
    return render_template('staff_dash.html', staff=staff)

<h2>Welcome, {{ staff.name }}</h2>
```
Flask-Login: {{ current_user.name }} — context_processor se har template mein user inject ho sakta hai.
Roll/dept extra fields same tarah pass karo.
40
Display the student's roll number on the Student Dashboard.

Times asked 1
Official solution

Simplecurrent user object template ko do, Jinja se naam print.
```
@app.route('/staff/dashboard')
def staff_dash():
    staff = Staff.query.get(session['user_id'])
    return render_template('staff_dash.html', staff=staff)

<h2>Welcome, {{ staff.name }}</h2>
```
Flask-Login: {{ current_user.name }} — context_processor se har template mein user inject ho sakta hai.
Roll/dept extra fields same tarah pass karo.
41
Display the current date.

Times asked 1
Official solution

Simplecurrent user object template ko do, Jinja se naam print.
```
@app.route('/staff/dashboard')
def staff_dash():
    staff = Staff.query.get(session['user_id'])
    return render_template('staff_dash.html', staff=staff)

<h2>Welcome, {{ staff.name }}</h2>
```
Flask-Login: {{ current_user.name }} — context_processor se har template mein user inject ho sakta hai.
Roll/dept extra fields same tarah pass karo.
42
Display the current date and time.

Times asked 1
Official solution

Simplecurrent user object template ko do, Jinja se naam print.
```
@app.route('/staff/dashboard')
def staff_dash():
    staff = Staff.query.get(session['user_id'])
    return render_template('staff_dash.html', staff=staff)

<h2>Welcome, {{ staff.name }}</h2>
```
Flask-Login: {{ current_user.name }} — context_processor se har template mein user inject ho sakta hai.
Roll/dept extra fields same tarah pass karo.
43
Change the dashboard heading to "{{ Name }}'s Dashboard".

Times asked 1
Official solution

Yeh live UI/CSS change hai. Examiner jo element bole uski CSS turant badlo.
Bootstrap class badlo (btn-primary → btn-success, bg-dark → bg-warning) ya inline style='color:red; background:#eee'.
Center: d-flex justify-content-center text-center. Navbar neeche: navbar fixed-bottom.
Example
```
<button class='btn btn-success' style='background:#16a34a'>Book</button>
```
Pehle browser inspect karke class dhundo, phir template mein change karke refresh.
44
Fetch and display all student names on the Company Dashboard using a Jinja for loop (including both applied and non-applied students).

Times asked 1
Official solution

Simple Jinja loop + if — examiner notepad mein likhwaata hai:
```
{% for t in treks %}
  <p>{{ t.name }} — {{ t.location }}</p>
{% else %}
  <p>No treks</p>
{% endfor %}

{% if user.role == 'admin' %}
  <button>Delete</button>
{% endif %}
```
List filter: {% if x > 10 %}{{ x }}{% endif %}
Length: {{ items|length }} Upper: {{ name|upper }}
Table: loop ke andar <tr><td>
45
Answer UI-related questions or explain your frontend implementation.

Times asked 1
Official solution

Examiner code pe ungli rakh ke poochta hai — panic mat karo, 4-line formula bolo.
1) Yeh file/line kya role hai (model / route / template / config)?
2) Input kahan se aata hai (form, URL <id>, session, JSON)?
3) DB pe kya query/write?
4) Output kya (render_template / redirect / jsonify)?
Example
```
@app.route('/book/<int:id>', methods=['POST']) — logged-in user session se, trek id URL se, Booking add, slots--, redirect history.
```
Unknown line: imports (request, url_for, flash), decorators, if checks, commit — har keyword ka reason ready rakho.

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