Lazy IITians – Viva Prep

Aug 14, 2026

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1
2.How do you ensure that a Student cannot register to the same Drive more than once? Show me which part of the code does that.

Times asked 2
Official solution

SimpleDuplicate booking/register rokne ke liye unique constraint + query check pehle.
Example
```
exists = Booking.query.filter_by(user_id=uid, slot_id=sid).first()
if exists:
    flash('Already booked'); abort/redirect
```
2

3.Open notepad and write an API that calculates sum of 2 numbers

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
3
5.List all API methods - GET,POST,PATCH,PUT,etc and explain them.

Times asked 2
Official solution

SimpleGET data read/show karta hai (idempotent). POST create/submit karta hai (form).
Example
```
@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        # validate + session
        ...
    return render_template('login.html')
```
4

6.Walkthrough of project

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.

Advice: He just listened and didn't intervene or tell me that I answered correctly or wrongly. Will mostly give marks ig. Was chill and the viva was over within 23 minutes.

See reviews Level1_96 MAD1 Level 1

Aug 14, 2026

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1

He was 5min late

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
2
What is Api?

Times asked 2
Official solution

SimpleAPI = interface jisse systems baat karein. Web API usually JSON return karti hai.
Example
```
@app.route('/api/lots')
def api_lots():
    return jsonify([{'id': l.id, 'name': l.name} for l in Lot.query.all()])
```
3
Show GitHub

Times asked 5
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.
4

I was on appointment tab of my user dashboard and He suddenly said change code to show only one appointment here all the other appointments in that user appointment page should not be visible (that page had active and past appointments together)

Times asked 2

Official solution

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

Advice: Try to understand your code as much as possible. He asked the same theory ques but he randomly asked the code changes.

See reviews Level2_142 MAD1 Level 2

Aug 14, 2026

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1

no theory questins asked

Times asked 2

Official solution

SimpleTheory = concepts: ORM, MVC, auth vs authz, Jinja inheritance, sessions. 1-line def + project example.
2

check all core funtionalities

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
3
celery working on specified time

Times asked 2
Official solution

SimpleCelery = background naukri. HTTP request ko 10 second email bhejne ke liye mat rokna.
Distributed task queue: aap function ko abhi nahi, worker process mein later/retry/schedule pe chalaate ho.
MAD2 typical jobs: daily reminder mail, monthly HTML report, user-triggered CSV export.
Web request 200ms hona chahiye. 10,000 emails request thread mein = timeout. Worker alag CPU pe kaam kare.
Redis broker chahiye. Beat alag process schedule ke liye.
Example
```
@celery.task
def daily_reminder():
    for u in User.query.filter_by(active=True):
        send_mail(u.email, 'Book something today!')
```
Project example: User Export click → 202 Accepted. Worker CSV + email. Daily 6pm Beat reminder.
Viva tipWorker + Redis bina Beat ke user-triggered chalega. Scheduled jobs ke liye Beat bhi chahiye.
4

asked ai %

Times asked 2

Official solution

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

clicking a button should return a message from backend ..a practcal demo should be shown

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.
6

in my case it took 48 mins be thorogh in linking frontend and backend

Times asked 2

Official solution

SimpleMAD1 frontend usually Jinja templates + HTML/CSS/Bootstrap (+ thoda JS). MAD2 pe Vue ho to clearly bolo.

Advice: practcal application should be known ..all the best

See reviews LEVEL1_viva14 MAD1 Level 1

Aug 14, 2026

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1

- Checks Id

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.
2
- Authentication vs Authorization

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)
```
3

- Horizontal vs Vertical Scaling

Times asked 1

Official solution

SimpleVertical badi machine. Horizontal aur boxes + load balancer. JWT stateless horizontal friendly.
10k users: Postgres, Redis, gunicorn, CDN, pagination, indexes.
Millions: replicas, queue partition, more workers.
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: Course app vertical enough. Design answer scale-out.
4
- Vue Lifecycle Hooks and their types

Times asked 1
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
- CLI vs CDN and approaches to scaling the application

Times asked 2
Official solution

SimpleCDN = Vue script tag se, jaise pen drive. CLI/Vite = poori factory (SFC, npm, bundle).
CDN: no build, chhote apps, exam PC pe Node nahi to bhi chal. Weak: no .vue compile, 3rd-party cache, scale/team.
CLI/Vite: Single File Components, env, code-split, production dist/. Scalable.
Examiner 'which + why' — jo use kiya wahi justify, doosra naam rato mat.
Example
```

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>

# Vite
npm run dev
npm run build
```
Project example: CDN: index.html unpkg vue. CLI: package.json, npm run serve / vite.
Viva tipCDN scalable large teams ke liye weak (no SFC compile, caching 3rd party). Examiner 'which + why' poochta hai — jo use kiya wahi justify karo.
6

- Be ready for hypothetical scenario-based questions(Simple only)

Times asked 2

Official solution

SimpleImprove ideas: caching, better validation, tests, pagination, email reminders, accessibility, mobile UI, logging.
Viva tip1-2 concrete features bolo jo time milne pe add karte — vague 'AI' mat.
7

- No coding questions in my case

Times asked 2

Official solution

SimpleLive coding: notepad/editor mein chhota Flask route / Jinja loop / model field. Calm raho, run karke dikhao.
8
*Edge Cases to Highlight in the Demonstration*

Times asked 2
Official solution

SimpleEdge cases: duplicate booking, full capacity, wrong role URL, empty search, invalid id.
Example
```
if Spot.query.get_or_404(spot_id).status != 'available':
    flash('Already taken')
    return redirect(...)
```
9

- Two patients should not be able to book the same doctor at the same time slot.

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
10
- A patient should not be able to book appointments with different doctors at the same time.

Times asked 2
Official solution

SimpleEdge cases: duplicate booking, full capacity, wrong role URL, empty search, invalid id.
Example
```
if Spot.query.get_or_404(spot_id).status != 'available':
    flash('Already taken')
    return redirect(...)
```

Advice: - Very calm and chill proctor, don't worry at all - Prepare your project demonstration thoroughly. - If you proactively demonstrate important edge cases without being asked, it creates a very strong impression. (I did that in my case and he was pretty impressed) -Wherever possible, support your theoretical answers by showing relevant parts of your code.(This demonstrates deeper understanding and practical knowledge.)

See reviews APPDEV_LEVEL1_VIVA16 MAD1 Level 1

Aug 14, 2026

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1

Show id card.

Times asked 2

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.

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.
3

Application demonstration.

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.
4

What is redis?

Times asked 3

Official solution

SimpleCelery background tasks (email, CSV, reports) async chalaata hai. Redis broker/queue + cache.
User 'Export' click → Celery task queue → Redis message → worker CSV banaata hai → user baad mein download.
Saath isliye: Celery ko broker chahiye, Redis tez in-memory. MAD2 topic zyada, MAD1 mein optional.
Priority: task queues/routing. Caching: Redis mein key-value, DB hits kam.
Pub/Sub: publisher channel pe message, subscribers sunte hain — Redis yeh bhi karta hai.
5

On Notepad Implement dashboard api to count patients and doctors and communicate it to frontend.

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
6
What is promise in JS.

Times asked 2
Official solution

Simpleasync function promise return karti hai. await us promise ka result wait karta hai — callback hell kam.
Example
```
async function loadLots() {
  const res = await fetch('/api/lots');
  const data = await res.json();
  return data;
}
```
7
Vue lifecycle hooks.

Times asked 3
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.

Advice: Very nice person, very patient and gives you time to run code, also help if you get stuck.

See reviews Level1_95 MAD1 Level 1

Aug 14, 2026

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1

- asked to show id

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.
2
- then told me to start with admin dashboard

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.
3

- then asked if i prevent a student from applying to the same drive, i showed code where i applied it

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
4
- then asked about lifecycle hook

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
- then, asked me to open notepad and write a route to sum two digit and return a json response

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'
```

Advice: Very Good proctor and Just practice the question,he asks a lot from the sheet, You will be fine. Even when my code didn't run and i fixing the issue, he was patient and understanding. only when it was taking to long, he said to move on. But he passed me in viva level 1

See reviews Level2_139 MAD1 Level 2

Aug 14, 2026

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1

Show your ID

Times asked 3

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.
2

Then he asked to add loop to show the login button ten times on student login page.

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
3

Then he asked to register student then company , then create drive , apply for drive and then he checked if student can apply for same drive twice.

Times asked 2

Official solution

SimpleViva wrap-up hai. Short thanks + confirm submission ZIP latest hai.
4
Then he checked the backend tasks and mail hog server

Times asked 2
Official solution

SimpleSMTP = Simple Mail Transfer Protocol — email bhejne ka standard. Flask-Mail / smtplib se reminders/reports.
Example
```
from flask_mail import Message
msg = Message('Subject', recipients=[user.email])
msg.body = 'Hello'
mail.send(msg)
```
Viva tipViva mein MailHog/inbox dikhao. Port 587 TLS common; local pe MailHog 1025.
5
Then he checked the export CSV trigger button on the frontend

Times asked 2
Official solution

SimpleClick → Celery → worker CSV → email/download. Columns verify.
csv module. Auth required. Don't freeze UI — 202 + poll.
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
```
@celery.task
def export_venues_csv(user_id):
    rows = Venue.query.all()
    # csv.writer, mail.send
    return 'ok'
```
Project example: Admin export venues. MailHog attach ya file open.
Viva tipNetwork tab mein job trigger API dikhao, phir MailHog/file open karke columns verify karo.

Advice: The examiner was good and supportive. Just run your code properly.

See reviews Level3_11 MAD1 Level 3

Aug 14, 2026

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1

NEED NOT BE IN ORDER (Based on Placement Portal App) Level 2:

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
Create a new company and create a drive with it. Then make a new student and apply for that.

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

Explain me your database file and structure.

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

Show any update function. (I showed him what we can update the application deadline)

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.
5
What is authentication. Show me where you have used it.

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: Really nice proctor. Finished my viva in 15 mins. Then I said about backend jobs which took extra 7, so total 22 mins, shorter than level 1. Also, for some reason the mail didn't go but I showed him the older ones. He just asked me to fix it. With him be confident. Go through the sheet. Some of his questions are repetative. One thing I have noticed is don't give straight one line answers. Explain your answers, if possible with your code. Like I showed him put and patch in my code, or opened the index.html when asked about SPA. I feel it build trust.

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