Lazy IITians – Viva Prep

See reviews Level2_139 MAD1 Level 2

Aug 14, 2026

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1

Demo the app with key features. Mine was Hospital, So, admin dashboard, adding doctor, editing doctor, Patient booking, Patient registration, cancel appointment, treatment details added by doctor, treatment details reviewed by patient.

Times asked 2

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
v-for example

Times asked 2
Official solution

SimpleVue live: two inputs v-model, button @click se first+last concat karke dikhao.
Example
```
<input v-model="first" /><input v-model="last" />
<button @click="full = first + ' ' + last">Go</button>
<p>{{ full }}</p>
```
3

What is JWT

Times asked 2

Official solution

SimpleJWT = JSON Web Token — signed string jisme user id/role hota hai. Har request header mein jaata hai. Session server pe store, JWT client pe.
Login → server token deta hai → Authorization: Bearer <token>
Payload: {sub: user_id, role: admin, exp: ...} — padha ja sakta hai, change nahi (signature).
Session: browser cookie, server-rendered Flask ke liye simple.
Token: mobile/Vue SPA, scaling (server memory nahi). Store: memory/httpOnly cookie, localStorage XSS risk.
MAD1 mostly session. Flask-Security session+login, JWT APIs ke liye.

Advice: 1. Start the demo within 10 mins.

See reviews Level2_127 MAD1 Level 2

Aug 14, 2026

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1
Write app.route in notepad for get and post only

Times asked 2
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'
```
2
What is authtication vs autorization

Times asked 2
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 / venue / drive delete kar sakta hai, normal user nahi.
MAD2 mein yeh alag layers hain: login API = authentication (JWT milta hai). @roles_required('admin') ya Vue v-if="isAdmin" = authorization.
Validation alag cheez hai (form sahi bhara hai ya nahi, jaise age 18+). Authentication identity hai, authorization permission, validation input quality.
Example
```
# Authentication
if user and check_password_hash(user.password, form_password):
    token = create_access_token(identity=user.id)

# Authorization
if current_user.role != 'admin':
    abort(403)  # logged in ho, lekin allowed nahi
```
Project example: Student login = authentication. Student admin dashboard nahi khol sakta = authorization. Frontend button hide sirf UX hai — asli check backend pe hona chahiye.
Viva tip401 = not logged in / bad token. 403 = logged in, role galat. Examiner yeh difference bahut poochta hai.
3
Show Background jobs celery and redis

Times asked 2
Official solution

SimpleRedis box hai, Celery us box se kaam uthane wala worker hai — same cheez nahi.
Redis: store (cache keys) + queue (broker lists).
Celery: Python library jo tasks define karti hai, .delay() se queue mein daalti hai, worker execute karta hai.
Dono localhost pe ho sakte hain. Alag Redis DB index use karo. Redis band = cache miss + Celery stuck.
Example
```
Celery: broker_url='redis://localhost:6379/0'
Cache:  CACHE_REDIS_URL='redis://localhost:6379/1'
```
Project example: export_csv.delay(user_id) Flask se. Worker Redis se task uthata hai, CSV+email. Cache alag keys venues.
Viva tipAgar possible ho to cache db=1, broker db=0 — keys mix nahi hoti.
4
Did you implement caching if yes show the api/ where did you implement

Times asked 2
Official solution

SimpleCache = pehli baar hisaab karke copy rakh lo, doosri baar copy dikha do.
Baar-baar same expensive kaam (DB query, counting bookings) mat karo. Result Redis jaise store mein timeout ke saath rakh do.
Cache hit: key mil gayi, DB skip. Cache miss: DB se lao, SET karo, return karo.
Tradeoff: speed vs stale data. Admin naya venue add kare aur cache 50s ka ho to user purani list dekh sakta hai — isliye write pe invalidation zaroori hai.
Browser cache, Flask-Caching, Redis alag layers hain. MAD2 examiner Redis + @cache.cached code dekhta hai.
Example
```
@cache.cached(timeout=50, query_string=True)
@app.route('/api/shows')
def shows():
    return jsonify([s.serialize() for s in Show.query.all()])
```
Project example: Admin dashboard counts / venues list cache. Create/update/delete ke baad cache.delete('venues').
Viva tipprint('DB queried') function ke andar laga ke miss/hit demo karo — hit pe print nahi chalega.

Advice: He is very calm and good proctor!

See reviews Level1_96 MAD1 Level 1

Aug 14, 2026

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1
GitHub Repo

Times asked 2
Official solution

SimpleGitHub repo open karo: commits, collaborators, README. Examiner check karta hai tumne khud kaam kiya.
Example
```
Settings → Collaborators
Commits: regular messages, last-day dump nahi.
```
Viva tipPrivate repo access pehle de do. Main branch submitted ZIP se match honi chahiye.
2

Where is caching implements

Times asked 2

Official solution

SimpleGET lists/stats @cache.cached. Mutations pe delete. CACHE_TYPE Redis.
Why each route: public repeated reads. User-private careful.
Redis in-memory key-value store hai — fridge pe sticky note, poori kitchen (SQL database) har baar mat kholo.
MAD2 mein Redis do kaam: (1) cache — same venues/shows/dashboard JSON baar-baar DB se nahi (2) Celery broker — Flask task queue mein daalta hai, worker uthata hai.
Flow: cache.get(key) → hit pe return, miss pe SQLAlchemy + SET with timeout. Admin write ke baad cache.delete, warna stale list.
Source of truth database hi hai. Redis crash/band = cache miss (app chalni chahiye) + queue ruk sakti hai. Important bookings sirf Redis mein mat rakho.
Alag: Redis ≠ Memcached (Celery broker nahi). Redis ≠ localStorage (woh browser). redis-cli ping → PONG viva proof.
Project example: File+line decorator. redis-cli get key optional.
3
Tell where is the cache getting stored

Times asked 2
Official solution

SimpleCache = pehli baar hisaab karke copy rakh lo, doosri baar copy dikha do.
Baar-baar same expensive kaam (DB query, counting bookings) mat karo. Result Redis jaise store mein timeout ke saath rakh do.
Cache hit: key mil gayi, DB skip. Cache miss: DB se lao, SET karo, return karo.
Tradeoff: speed vs stale data. Admin naya venue add kare aur cache 50s ka ho to user purani list dekh sakta hai — isliye write pe invalidation zaroori hai.
Browser cache, Flask-Caching, Redis alag layers hain. MAD2 examiner Redis + @cache.cached code dekhta hai.
Example
```
@cache.cached(timeout=50, query_string=True)
@app.route('/api/shows')
def shows():
    return jsonify([s.serialize() for s in Show.query.all()])
```
Project example: Admin dashboard counts / venues list cache. Create/update/delete ke baad cache.delete('venues').
Viva tipprint('DB queried') function ke andar laga ke miss/hit demo karo — hit pe print nahi chalega.
4
JWT token vs Sessions

Times asked 2
Official solution

SimpleMAD1 mein usually session-based auth: login pe session['user_id'], har request pe verify.
Example
```
session['user_id'] = user.id
uid = session.get('user_id')
user = User.query.get(uid)
```
Viva tipSECRET_KEY set karo warna session insecure. logout pe session.clear().
5
Change the position of navbar from top to bottom

Times asked 2
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
Show the mail of daily reminder

Times asked 2
Official solution

SimpleLive jobs: Redis, worker, beat, crontab abhi, logs + email/CSV.
Scheduled vs user-triggered dono dikhao. Missing feature honestly.
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) redis
2) worker
3) beat
4) crontab now
5) logs + MailHog
Example
```
CELERY_BEAT_SCHEDULE = {
  'daily-reminder': {
    'task': 'jobs.daily_reminder',
    'schedule': crontab(hour=18, minute=0),
  },
}
```
Project example: Change schedule current time. MailHog. Export button 202.
7

how do you implemented the celery tasks

Times asked 2

Official solution

SimpleCode explain formula: input kya aaya → auth/validation → DB change → response/UI.
Viva tipFunction signature + 3-4 important lines + edge case.

Advice: Good proctor, very calm, gave enough time to run the project. Make sure you really know your code and how it’s implemented.

See reviews Level1_95 MAD1 Level 1

Aug 14, 2026

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1
Company registration logic

Times asked 1
Official solution

SimpleRegistration: form → validate unique email → hash password → db.session.add/commit → redirect login.
Example
```
if User.query.filter_by(email=email).first():
    flash('Taken')
else:
    db.session.add(User(email=email, password=generate_password_hash(pwd)))
    db.session.commit()
```
2
api to return the sum of 2 inputs taken from front end

Times asked 2
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: he is very chill dont worry at all.

See reviews APPDEV-LEVEL1_VIVA1 MAD1 Level 1

Aug 14, 2026

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1
Checked the GitHub and demo

Times asked 2
Official solution

SimpleGitHub repo open karo: commits, collaborators, README. Examiner check karta hai tumne khud kaam kiya.
Example
```
Settings → Collaborators
Commits: regular messages, last-day dump nahi.
```
Viva tipPrivate repo access pehle de do. Main branch submitted ZIP se match honi chahiye.
2
Write a code to print hi when a button is clicked

Times asked 2
Official solution

SimpleNaya Flask route: URL, method, auth if needed, query, jsonify. Postman pehle.
Examiner number/filter change easy rakhna. CORS. Frontend tabhi jab bole.
Status codes sahi. Password JSON mein nahi.
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.
Example
```
@app.route('/api/sum', methods=['POST'])
def sum_num():
    d = request.get_json()
    return jsonify(result=d['a'] + d['b'])
```
Project example: resources.py new Resource. Test Thunder. Optional Vue fetch.
3
Write a code to retrieve doctor details related to an appointment

Times asked 2
Official solution

SimpleNaya Flask route: URL, method, auth if needed, query, jsonify. Postman pehle.
Examiner number/filter change easy rakhna. CORS. Frontend tabhi jab bole.
Status codes sahi. Password JSON mein nahi.
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.
Example
```
@app.route('/api/sum', methods=['POST'])
def sum_num():
    d = request.get_json()
    return jsonify(result=d['a'] + d['b'])
```
Project example: resources.py new Resource. Test Thunder. Optional Vue fetch.
4
What are lifecycle hooks in vue

Times asked 2
Official solution

SimpleLifecycle = component ki zindagi ke stages. API call tab jab DOM ready ho — mounted.
created: instance bani, this data, DOM nahi. mounted/onMounted: page pe aa gaya — fetch, Chart.js, setInterval.
updated: data change ke baad. unmounted: cleanup (clearInterval) warna memory leak.
Dashboards onMounted isliye: canvas/API tab valid. created mein $el nahi.
Composition: onMounted(() => {}) setup ke andar.
Example
```
export default {
  async mounted() {
    const r = await fetch('/api/venues')
    this.venues = await r.json()
  }
}
```
Project example: Venues.vue mounted fetch list. Clock component unmounted pe interval clear.
Viva tipcreated: data setup, DOM nahi. mounted/onMounted: $el mil gaya — fetch yahi. Dashboards isliye onMounted use karti hain.
5
Which one did u use session based or token based

Times asked 2
Official solution

SimpleMAD1 mein usually session-based auth: login pe session['user_id'], har request pe verify.
Example
```
session['user_id'] = user.id
uid = session.get('user_id')
user = User.query.get(uid)
```
Viva tipSECRET_KEY set karo warna session insecure. logout pe session.clear().
6

Explain how celery works

Times asked 2

Official solution

SimpleCode explain formula: input kya aaya → auth/validation → DB change → response/UI.
Viva tipFunction signature + 3-4 important lines + edge case.
7
Where is cache stored

Times asked 2
Official solution

SimpleCache = pehli baar hisaab karke copy rakh lo, doosri baar copy dikha do.
Baar-baar same expensive kaam (DB query, counting bookings) mat karo. Result Redis jaise store mein timeout ke saath rakh do.
Cache hit: key mil gayi, DB skip. Cache miss: DB se lao, SET karo, return karo.
Tradeoff: speed vs stale data. Admin naya venue add kare aur cache 50s ka ho to user purani list dekh sakta hai — isliye write pe invalidation zaroori hai.
Browser cache, Flask-Caching, Redis alag layers hain. MAD2 examiner Redis + @cache.cached code dekhta hai.
Example
```
@cache.cached(timeout=50, query_string=True)
@app.route('/api/shows')
def shows():
    return jsonify([s.serialize() for s in Show.query.all()])
```
Project example: Admin dashboard counts / venues list cache. Create/update/delete ke baad cache.delete('venues').
Viva tipprint('DB queried') function ke andar laga ke miss/hit demo karo — hit pe print nahi chalega.
8
Asked me to show the backend code

Times asked 2
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.

Advice: Chill guy Gave me 10 min time to setup my project Just revise the sheet

See reviews LEVEL1_viva14 MAD1 Level 1

Aug 14, 2026

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1

this was for level 1

Times asked 2

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

show github profile, id card, and demo

Times asked 2

Official solution

SimpleCamera pe clearly college/IITM ID dikhao — naam aur photo match hone chahiye.
Viva tipPehle se ID haath mein rakho, glare mat aane do. Iske baad GitHub + project run.
3

explain relations you've made in db

Times asked 2

Official solution

SimpleCode explain formula: input kya aaya → auth/validation → DB change → response/UI.
Viva tipFunction signature + 3-4 important lines + edge case.
4

frontend change: display welcome message when user logs in that's it

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
5

explain 2-3 api routes (he will pick)

Times asked 2

Official solution

SimpleCode explain formula: input kya aaya → auth/validation → DB change → response/UI.
Viva tipFunction signature + 3-4 important lines + edge case.
6

how did you implement xyz (easy questions)

Times asked 2

Official solution

SimpleCode explain formula: input kya aaya → auth/validation → DB change → response/UI.
Viva tipFunction signature + 3-4 important lines + edge case.

Advice: 100/10 proctor, very chill, just stay calm

See reviews Level2_139 MAD1 Level 2

Aug 14, 2026

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1

Show ID card

Times asked 4

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 collaborator on GitHub Repo

Times asked 1
Official solution

SimpleGitHub repo open karo: commits, collaborators, README. Examiner check karta hai tumne khud kaam kiya.
Example
```
Settings → Collaborators
Commits: regular messages, last-day dump nahi.
```
Viva tipPrivate repo access pehle de do. Main branch submitted ZIP se match honi chahiye.
3

Download and setup the code from the portal

Times asked 2

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
4

Show code for anyone route of API (admin in my case)

Times asked 2

Official solution

SimpleCode dikhao to pehle related file: models → route → template. Flow explain karte hue lines padho.
5

Show code for any view in frontend (again admin dashboard)

Times asked 2

Official solution

SimpleCode dikhao to pehle related file: models → route → template. Flow explain karte hue lines padho.
6

Demo specific things in the application which he was asking for

Times asked 2

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.
7

Show backend job and email trigger

Times asked 2

Official solution

SimpleDemo 5–7 min ki kahani: saari roles, koi milestone skip nahi, bolte-bolte dikhao.
Examiner list tick karta hai. Crash ho to panic nahi — terminal error padho.
Code tab kholna jab poochhein. Extra uncommitted features mat dikhana agar portal ZIP mein nahi.
Suggested flow1) Register/login user
2) Admin login — CRUD
3) Approval/blacklist
4) Booking/apply + edge case
5) Search + charts
6) CSV export / email job
7) Logout
Project example: Jo statement/parking/jobs/tickets hai uske user+admin journeys.
Viva tipBol: 'Yahan overbooking rokta hoon'. Mandatory features pehle, polish baad.
8

Other questions:

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
9

Difference between v-if and v-show

Times asked 4

Official solution

Simplev-if element DOM se hataata/jodata hai, v-show sirf CSS display toggle karta hai.
v-if='isAdmin' → false ho to element exist hi nahi. Costly toggle, lekin hidden data DOM mein nahi.
v-show='open' → display:none. Fast toggle, element hamesha DOM mein.
Rare condition: v-if. Bar-bar toggle (dropdown): v-show.
10

How child component can send data to parent component?

Times asked 2

Official solution

SimpleCode explain formula: input kya aaya → auth/validation → DB change → response/UI.
Viva tipFunction signature + 3-4 important lines + edge case.
11

Where is jwt stored in the application?

Times asked 2

Official solution

SimpleLogin token create. Decorators protected APIs. JWT/Security init factory.
Where JWT authentication implemented backend. Show auth code.
Authentication poochta hai "tu kaun hai?", Authorization poochta hai "tujhe yeh kaam karne ki permission hai?"
Authentication: login. Username + password hash check. Success pe JWT/session. Galat credentials = 401.
Authorization: uske baad role. Admin hi venue/lot delete kare, student nahi = 403 (logged in ho, allowed nahi).
MAD2: POST /api/login = authentication. @jwt_required identity. @roles_required('admin') ya Vue v-if="isAdmin" = authorization. Frontend hide sirf UX — asli deny backend pe.
Validation alag: form sahi bhara (email format, age 18+). Woh identity prove nahi karta. Password store hash (Werkzeug), JWT payload padha ja sakta hai isliye secret mat daalo.
Project example: auth.py + decorators.

Advice: Chill proctor; just be confident in your answers rest is easy

See reviews Level3_49 MAD1 Level 3

Aug 14, 2026

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1
Frontend - Asked me to disappear a button based on a condition (use v-if)

Times asked 2
Official solution

Simplev-if ghar se nikaal deta hai (DOM se). v-show sirf light band karta hai (display:none).
v-if false → element exist hi nahi — costly create/destroy, lekin secret HTML DOM mein nahi.
v-show → hamesha DOM, CSS hide, toggle tez.
Rare / permission UI: v-if (admin panel). Dropdown bar-bar: v-show.
: shorthand v-bind ka, v-if ka nahi.
Example
```
<div v-if="isAdmin">Admin panel</div>
<div v-show="open">Dropdown</div>
```
Project example: Admin links v-if="role==='admin'". FAQ accordion v-show="open".
Viva tipSecurity ke liye sirf v-if kaafi nahi — API 403 bhi chahiye.
2

Backend - to not allow a company to register if the count of companies pending admin approval is more than 1

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
3
Is celery and redis implemented - show. How is token authentication implemented, how the tables are stored, about SMTP, a lot about Vue js and it's versions, about virtual DOM etc.

Times asked 2
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: The viva went on for 1 hour exactly. He'll ask questions about anything on the screen or anything you mention - he sounded like a student, chill guy but will test your knowledge with a lot of questions. Prepare well and you're good.

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