Viva prep · Real questions · Student experiences Enroll in Bootcamp

Study workspace

Viva Prep

Prepare in structure for the Project Mentorship.

18945 Questions
268 Proctors

Lazy IITians

Who are we?

A student-built prep community for IITM BS — real viva questions, shared experiences, and structured practice so you walk into mentorship confident.

Fill the form and join us

Enroll in Bootcamp

Find questions

Search by question text across the whole library, then narrow with subject, level, and proctor.

Share your experience Add your viva experience here

Question sets

  1. 1
    Checksum
    Times asked 5
    Official solution

    SimpleExaminer wohi ZIP chahta hai jo tumne submit kiya, local extra magic nahi.

    Portal download → extract → redis, venv, pip, npm, flask, worker, beat.

    Checksum maange to hash. Uncommitted files mat dikhana.

    Examiner 2 cheezein: simple desi line + tumhare project ki exact file.

    Pehle ID, GitHub, portal ZIP. Phir run: Redis + Flask + worker + beat + Vue. Feature demo: login, RBAC, cache hit/miss, Celery mail, search.

    Line pe ungli: input kahan, kaunsa check, query/cache/task, JSON/UI. Copilot band. Jo nahi kiya honestly bolo + kaise add karte.

    Suggested flow1) ZIP
    2) Extract
    3) Redis + venv + pip
    4) npm/vite
    5) flask + celery worker + beat

    Project example: Submitted zip run. README commands copy.

    Viva tipChecksum maange to hash match karke dikhao. Extra uncommitted files mat dikhana.

  2. 2
    Then asked to download off of the submission portal
    Times asked 1
    Official solution

    SimpleExaminer portal wala submitted ZIP chahta hai. Local extra changes mat dikhana.

    Suggested flow1) Portal ZIP download
    2) Extract
    3) venv + pip install -r requirements.txt
    4) flask run / python app.py

  3. 3
    Looked at model.py
    Times asked 1
    Official solution

    Simplemodels.py = har table ki class: columns, PK/FK, relationships. Yeh Model layer hai.

    Suggested flow1) Classes list karo
    2) Har table ka kaam 1 line
    3) Relationships (1-M / M-M)
    4) Constraints (unique, nullable)

    Example

    class Lot(db.Model):
        id = db.Column(db.Integer, primary_key=True)
        name = db.Column(db.String(80), nullable=False)
        spots = db.relationship('Spot', backref='lot', lazy=True)
  4. 4
    Started with the presentation(more like asked me to show the functionalities she was asking for like register as company, create drive, blacklist a company, etc) Code implementation(in vs code itself):
    Times asked 1
    Official solution

    SimpleBlacklist/block: user.status='blocked' check login/booking pe. Temporary flag vs hard delete permanent.

  5. 5
    Change the create drive route so that a company can not create a new drive if they already have an ongoing drive.
    Times asked 1
    Official solution

    SimpleLive UI change: relevant CSS/HTML template kholo — color, margin, flex, bootstrap class. Save + hard refresh.

    Example

    /* button red */
    .btn-primary { background: red; }
    
    /* center navbar item */
    .navbar { justify-content: center; }

    Viva tipDevTools se pehle try, phir file mein permanent change.

  6. 6
    Add a delete button beside the blacklisted students (only the front end part of it, the button should show on the website not the backend implementation of it's functionality) Notepad code:
    Times asked 1
    Official solution

    SimpleBlacklist/block: user.status='blocked' check login/booking pe. Temporary flag vs hard delete permanent.

  7. 7
    Write code to initialise and run a flask app. Questions asked:
    Times asked 1
    Official solution

    SimpleLive Flask coding: chhota route likho, save, browser/curl se test. Syntax error terminal mein padho.

    Example

    @app.route('/ping')
    def ping():
        return jsonify(ok=True)
    
    @app.route('/even/<int:n>')
    def even(n):
        return 'even' if n % 2 == 0 else 'odd'
  8. 8
    Difference between authentication and authorisation.
    Times asked 1
    Official solution

    SimpleAuthentication: tu kaun hai? (login). Authorization: tujhe permission hai? (role check).

    Example

    # auth
    if check_password_hash(user.password, pwd):
        session['user_id'] = user.id
    
    # authz
    if user.role != 'admin':
        abort(403)
  9. 9
    Difference between PUT, POST, PATCH.
    Times asked 1
    Official solution

    SimplePOST naya janam (har baar naya id). PUT poori photo replace. PATCH sticker chipkao.

    POST create, not idempotent. PUT full update, idempotent. PATCH partial.

    POST ki jagah PUT se REST semantics toot. GET typically no body.

    CRUD map: POST create, GET read, PUT/PATCH update, DELETE delete.

    Pehle 1-line definition, phir related MAD2 layer (Vue SFC / Flask route / models.py / tasks.py / Redis).

    4-line formula: input kahan se aaya, auth/validation kaunsa, DB ya cache ya Celery, kya return.

    Related mix mat karo — cache ≠ Celery, authentication ≠ authorization, v-if ≠ v-show, Beat ≠ Worker. Follow-up ke liye ek difference ready rakho.

    Example

    POST /api/venues
    PUT  /api/venues/1   {all fields}
    PATCH /api/venues/1 {only name}

    Project example: POST /api/venues create. PUT /venues/1 saari fields. PATCH sirf name.

Advice: Based on her previous term vivas I saw that she has a habbit of repeating the questions (you can see in that too). Even the code implementation she asked me were the same as that of the batch 1 student in this sheet. Don't bank on it though, but make sure to at least cover these. She is pretty straighforward and would likely just move on if you look stuck without giving hints. GOOD LUCK!!!!
  1. 1
    Only show shortlisted candidates.
    Times asked 1
    Official solution

    SimpleDemo script pehle se practice: 5–7 min, Admin + User roles, saare mandatory features.

    Suggested flow1) Register/login user
    2) Admin login — CRUD
    3) Approval/blacklist
    4) Booking/apply + edge case
    5) Search
    6) Logout

    Viva tipBolte-bolte dikhao. Code tab kholna jab poochhein.

Advice: Nice mam, kind. Good proctor Revise all previous question, mostly questions are from here only
  1. 1
    LEVEL 1
    Times asked 6
    Official solution

    SimpleLevel = viva difficulty band. Level 1 usually demo + basics; higher pe live coding + deeper theory.

    Viva tipJo level assign hai uske hisaab se demo + theory ready rakho.

  2. 2
    In notepad- jinja for loop, route to hello world
    Times asked 1
    Official solution

    SimpleJinja for loop list render karta hai. loop.index, else branch empty list pe.

    Example

    {% for u in users %}
      <tr><td>{{ loop.index }}</td><td>{{ u.email }}</td></tr>
    {% endfor %}
  3. 3
    Git collab status and demo of the app (he asked me to register company, student, make drives, search function)
    Times asked 1
    Official solution

    SimpleSearch: form/query param → ilike filter → results template.

    Example

    q = request.args.get('q', '').strip()
    lots = Lot.query.filter(Lot.name.ilike(f'%{q}%')).all()
  4. 4
    What is post vs put?
    Times asked 1
    Official solution

    SimplePOST naya janam (har baar naya id). PUT poori photo replace. PATCH sticker chipkao.

    POST create, not idempotent. PUT full update, idempotent. PATCH partial.

    POST ki jagah PUT se REST semantics toot. GET typically no body.

    CRUD map: POST create, GET read, PUT/PATCH update, DELETE delete.

    Pehle 1-line definition, phir related MAD2 layer (Vue SFC / Flask route / models.py / tasks.py / Redis).

    4-line formula: input kahan se aaya, auth/validation kaunsa, DB ya cache ya Celery, kya return.

    Related mix mat karo — cache ≠ Celery, authentication ≠ authorization, v-if ≠ v-show, Beat ≠ Worker. Follow-up ke liye ek difference ready rakho.

    Example

    POST /api/venues
    PUT  /api/venues/1   {all fields}
    PATCH /api/venues/1 {only name}

    Project example: POST /api/venues create. PUT /venues/1 saari fields. PATCH sirf name.

  5. 5
    what is git?
    Times asked 1
    Official solution

    SimpleGit VCS tool. VCS concept. GitHub hosting. SCM another name.

    commit branch merge. Examiner history. Git ≠ GitHub.

    Pehle 1-line definition, phir related MAD2 layer (Vue SFC / Flask route / models.py / tasks.py / Redis).

    4-line formula: input kahan se aaya, auth/validation kaunsa, DB ya cache ya Celery, kya return.

    Related mix mat karo — cache ≠ Celery, authentication ≠ authorization, v-if ≠ v-show, Beat ≠ Worker. Follow-up ke liye ek difference ready rakho.

    Project example: git log. collaborators. README.

  6. 6
    why use virtual environemnts?
    Times asked 1
    Official solution

    SimplePehle 1-line definition, phir apne MAD1 project mein file dikhao, phir chhota example.

    Suggested flow1) Concept kya hai?
    2) Mere code mein kahan?
    3) Example / demo
    4) Edge case

    Example

    # related file: models.py / routes / template
    # formula: request → check/auth → DB → render/redirect

    Viva tipExact line yaad nahi to honestly related part dikhao. Bluff mat karo.

  7. 7
    Background color change (I was using boostrap)
    Times asked 1
    Official solution

    SimpleLive UI change: relevant CSS/HTML template kholo — color, margin, flex, bootstrap class. Save + hard refresh.

    Example

    /* button red */
    .btn-primary { background: red; }
    
    /* center navbar item */
    .navbar { justify-content: center; }

    Viva tipDevTools se pehle try, phir file mein permanent change.

Advice: Went very smooth. No worries.
  1. 1
    -project demonstration with all features and funtionalities
    Times asked 1
    Official solution

    SimpleDemo script pehle se practice: 5–7 min, Admin + User roles, saare mandatory features.

    Suggested flow1) Register/login user
    2) Admin login — CRUD
    3) Approval/blacklist
    4) Booking/apply + edge case
    5) Search
    6) Logout

    Viva tipBolte-bolte dikhao. Code tab kholna jab poochhein.

  2. 2
    -what is MVC and show in your project
    Times asked 1
    Official solution

    SimpleMVC: Model=data (SQLAlchemy), View=Jinja HTML, Controller=Flask routes/business logic.

    Flask loosely MVC follow karta hai — routes controllers, templates views, models.py models.

  3. 3
    -flask route code for the registering the user
    Times asked 1
    Official solution

    SimpleLive Flask coding: chhota route likho, save, browser/curl se test. Syntax error terminal mein padho.

    Example

    @app.route('/ping')
    def ping():
        return jsonify(ok=True)
    
    @app.route('/even/<int:n>')
    def even(n):
        return 'even' if n % 2 == 0 else 'odd'
Advice: mam was chill and completed in 20 minutes , prepare the questions in this sheet that is more than enough.
  1. 1
    Asked difference between filter and filter by
    Times asked 1
    Official solution

    Simplefilter_by simple keyword arguments, filter full SQL-style conditions.

    User.query.filter_by(email='a@x.com').first()  # column=value, easy
    User.query.filter(User.age > 18, User.city == 'Delhi').all()  # comparisons, OR, LIKE

    filter_by sirf equals ke liye. Greater-than, LIKE, joins ke liye filter() use karo.

    Example search

    Trek.query.filter(Trek.name.ilike(f'%{q}%')).all()

    Yeh filter_by se nahi hoga.

  2. 2
    What are requests?
    Times asked 1
    Official solution

    SimplePehle 1-line definition, phir apne MAD1 project mein file dikhao, phir chhota example.

    Suggested flow1) Concept kya hai?
    2) Mere code mein kahan?
    3) Example / demo
    4) Edge case

    Example

    # related file: models.py / routes / template
    # formula: request → check/auth → DB → render/redirect

    Viva tipExact line yaad nahi to honestly related part dikhao. Bluff mat karo.

Advice: Level1 91 sir was really patient and helpful. Revise all concepts and you should be fine.
  1. 1
    Show a full demo of the project (was completely left to me, and didn't ask anything specific initially)
    Times asked 1
    Official solution

    SimpleDemo script pehle se practice: 5–7 min, Admin + User roles, saare mandatory features.

    Suggested flow1) Register/login user
    2) Admin login — CRUD
    3) Approval/blacklist
    4) Booking/apply + edge case
    5) Search
    6) Logout

    Viva tipBolte-bolte dikhao. Code tab kholna jab poochhein.

  2. 2
    Explain the schema and relationships of my app
    Times asked 1
    Official solution

    Simpledb.relationship se object graph: lot.spots, booking.user. backref reverse side auto deta hai.

    Example

    spots = db.relationship('Spot', backref='lot', cascade='all, delete-orphan')
  3. 3
    Explain a controller (with both the view changing, and the code behind)
    Times asked 1
    Official solution

    SimpleCode explain formula: input kya aaya → auth/validation → DB change → response/UI.

    Viva tipFunction signature + 3-4 important lines + edge case.

  4. 4
    Go through a full route (I explained the student routes, and how registration follows logging follows seeing dashboard and so on)
    Times asked 1
    Official solution

    SimpleDemo script pehle se practice: 5–7 min, Admin + User roles, saare mandatory features.

    Suggested flow1) Register/login user
    2) Admin login — CRUD
    3) Approval/blacklist
    4) Booking/apply + edge case
    5) Search
    6) Logout

    Viva tipBolte-bolte dikhao. Code tab kholna jab poochhein.

  5. 5
    Add a new column to a user (so add it in schema, add in registration (both the html and flask), and add it in dashboard and other places it should be shown)
    Times asked 1
    Official solution

    SimpleFlask lightweight Python web framework — routes, request/response, templates. MAD1 ka backend yahi hai.

    Example

    from flask import Flask
    app = Flask(__name__)
    
    @app.route('/')
    def home():
        return 'Hello'

    Viva tipFlask micro hai: jo chahiye (DB, login, forms) khud jodte ho.

  6. 6
    Change the color of a button using CSV (I was allowed to refer to my previous css code)
    Times asked 1
    Official solution

    SimpleLive UI change: relevant CSS/HTML template kholo — color, margin, flex, bootstrap class. Save + hard refresh.

    Example

    /* button red */
    .btn-primary { background: red; }
    
    /* center navbar item */
    .navbar { justify-content: center; }

    Viva tipDevTools se pehle try, phir file mein permanent change.

  7. 7
    Some theory questions about Authorization vs Authentication, and what is CSRF
    Times asked 1
    Official solution

    SimpleAuthentication: tu kaun hai? (login). Authorization: tujhe permission hai? (role check).

    Example

    # auth
    if check_password_hash(user.password, pwd):
        session['user_id'] = user.id
    
    # authz
    if user.role != 'admin':
        abort(403)
Advice: Just don't panic, they will wait for you to think and do stuff. Make sure you know your code well enough to point to anything they ask for, and that you can make changes to the code on the spot like mentioned above Gluckk
  1. 1
    LEVEL2
    Times asked 1
    Official solution

    SimpleLevel = viva difficulty band. Level 1 usually demo + basics; higher pe live coding + deeper theory.

    Viva tipJo level assign hai uske hisaab se demo + theory ready rakho.

  2. 2
    -asked question while demo about how resumes were getting stored
    Times asked 1
    Official solution

    SimpleDemo script pehle se practice: 5–7 min, Admin + User roles, saare mandatory features.

    Suggested flow1) Register/login user
    2) Admin login — CRUD
    3) Approval/blacklist
    4) Booking/apply + edge case
    5) Search
    6) Logout

    Viva tipBolte-bolte dikhao. Code tab kholna jab poochhein.

  3. 3
    -add a course option on registeration page and show it is connected to the db
    Times asked 1
    Official solution

    SimpleDemo script pehle se practice: 5–7 min, Admin + User roles, saare mandatory features.

    Suggested flow1) Register/login user
    2) Admin login — CRUD
    3) Approval/blacklist
    4) Booking/apply + edge case
    5) Search
    6) Logout

    Viva tipBolte-bolte dikhao. Code tab kholna jab poochhein.

  4. 4
    -vector scaling vs standard scaling
    Times asked 1
    Official solution

    SimpleUngli rakhe to 4-line formula — panic ki jagah structure.

    1) File ka role: model / Flask route / Vue SFC / celery task / config
    2) Input kahan: JSON, params, token, props, $route
    3) Kya kaam: query, cache, validation, .delay()
    4) Output: jsonify, this.items, email, redirect

    Unknown keyword: import, decorator, if, commit — har ka reason. Bluff mat.

    Suggested flow1) Kaunsi layer?
    2) Input?
    3) DB/cache/task?
    4) Response/UI?

    Project example: Booking POST: jwt, seats check, commit, 201, Vue list push.

    Viva tipUnknown keyword: import, decorator, if, commit — har ka reason. Panic mat.

  5. 5
    -diff between render_templates and redirect
    Times asked 1
    Official solution

    Simplerender_template Jinja HTML file ko data deke final HTML banata hai.

    Example

    return render_template('dashboard.html', user=user, lots=lots)
Advice: proctor is patient and lets you think just go through your code line by line
  1. 1
    He came 20 mins late but the POD came and told to wait for him to come.
    Times asked 1
    Official solution

    SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.

  2. 2
    Asked to demo the project fully and asked small small questions in between like asking functionality
    Times asked 1
    Official solution

    SimpleDemo script pehle se practice: 5–7 min, Admin + User roles, saare mandatory features.

    Suggested flow1) Register/login user
    2) Admin login — CRUD
    3) Approval/blacklist
    4) Booking/apply + edge case
    5) Search
    6) Logout

    Viva tipBolte-bolte dikhao. Code tab kholna jab poochhein.

  3. 3
    Show the search operation for filtering and explain it
    Times asked 1
    Official solution

    SimpleSearch: form/query param → ilike filter → results template.

    Example

    q = request.args.get('q', '').strip()
    lots = Lot.query.filter(Lot.name.ilike(f'%{q}%')).all()
Advice: Be confident in your code and explain everything to the best you can. He will listen properly and understand your code. Chill proctor. Learn your theory well. He also gives very nice tips and ways to better clean up your code and ways to implement more functionality. Listen to his tips coz they're very useful. Very nice proctor.
Maintaine By Lazy IITians Team + IITM BS students Regualr for More data you have