The IIT Madras BS Modern Application Development II (MAD 2) End Term paper sat on 13 Sept 2026, in the May 2026 term, set S2: 31 questions for 95.5 marks in 180 minutes. Every question is below with its answer. Take it as a timed mock test to be marked, or read it through first.
The header stores the encrypted password used to generate the signature.
The signature only protects the payload section; changes to the header do not affect token validation.
The signature is generated using the encoded header, encoded payload, and a secret key. If the header is modified, the signature verification fails.
The header contains the final signature hash generated after token creation.
Correct answer
The signature is generated using the encoded header, encoded payload, and a secret key. If the header is modified, the signature verification fails.
A news platform wants to send a morning digest email to all subscribers every day at 7 AM. Sweta sets up the beat schedule, starts Redis and Celery Beat, and then claims: "The Worker is optional here. Beat handles the scheduling and the execution of the task, so we do not need a separate Worker process."
Is Sweta's claim correct? Choose the best answer.
No. Celery Beat is only a scheduler. At 7 AM, it pushes a task message into the Redis broker and stops there. Without a running Celery Worker to pick up that message, the digest email is never actually sent.
Correct answer
No. Celery Beat is only a scheduler. At 7 AM, it pushes a task message into the Redis broker and stops there. Without a running Celery Worker to pick up that message, the digest email is never actually sent.
A startup is building a food delivery app. The customer-facing screen shows live order status updates: "Order Placed → Preparing → Out for Delivery → Delivered".
Each stage is triggered by the restaurant or the delivery rider updating the status on their end. The customer's screen should reflect these changes in real time without refreshing the page.
Two developers debate about the right technology: Developer A says: "Let's use Server-Sent Events. It's the right fit here." Developer B says: "No, we must use WebSockets. SSE won't work."
Who is correct, and why?
Developer B is correct. SSE cannot transmit JSON data, so structured order status objects cannot be pushed to the browser.
Developer B is correct. SSE connections do not reconnect automatically when the network is briefly interrupted, making it unreliable for a live tracker.
Developer A is correct, but only if WebSockets are set up as a mandatory fallback, since SSE requires HTTP/2 to function.
Developer A is correct. The tracker only requires the server to push status updates to the customer, without the customer sending data back through the same connection. SSE is purpose-built for exactly this one-way server-to-client push scenario.
Correct answer
Developer A is correct. The tracker only requires the server to push status updates to the customer, without the customer sending data back through the same connection. SSE is purpose-built for exactly this one-way server-to-client push scenario.
File: app.js
Delhi
Indore
Raipur
Rewa
Correct answer
Rewa
In a Celery setup, we use two separate Redis databases:
Which of the following best explains the conceptual difference between the broker and the backend?
The backend is only needed when tasks involve sending emails; for tasks that only read from the database, only the broker is required.
The broker and backend must always use different port numbers; using the same Redis port for both would cause a conflict.
The broker distributes tasks evenly across multiple Celery workers, while the backend tracks which worker is currently processing which task.
The broker stores task requests until a Celery worker picks and executes them, while the backend stores the task result after execution.
Correct answer
The broker stores task requests until a Celery worker picks and executes them, while the backend stores the task result after execution.
A team builds an internal warehouse dashboard where multiple managers, each on a different computer, need to receive live low-stock alerts from the server in real time. They decide to use Flask-SSE with Redis.
Which of the following best explains Redis's role in a Flask-SSE setup?
Redis is used by Flask-SSE to authenticate connected users before events can be streamed to the browser.
Redis is optional in Flask-SSE and is only recommended when the application has a very large number of concurrent users.
Redis is only needed when SSE events must be stored permanently and replayed after reconnection.
Flask-SSE uses Redis as a shared event channel so published messages can be delivered to connected clients.
Correct answer
Flask-SSE uses Redis as a shared event channel so published messages can be delivered to connected clients.
Match the testing concept in Column I with the most appropriate description in Column II.
1-C, 2-B, 3-A, 4-D
1-B, 2-C, 3-D, 4-A
1-A, 2-D, 3-B, 4-C
1-C, 2-D, 3-A, 4-B
Correct answer
1-C, 2-D, 3-A, 4-B
Match the performance metric in Column I with the most appropriate description in Column II.
1-C, 2-D, 3-B, 4-A
1-B, 2-C, 3-A, 4-D
1-C, 2-B, 3-D, 4-A
1-A, 2-B, 3-D, 4-C
Correct answer
1-C, 2-D, 3-B, 4-A
A developer has just created a new Vue 2 project using Vue CLI and the following package.json was generated.
package.json
Correct answer
Consider the following JavaScript code:
What will be output on the browser’s console?
(A figure from the original paper is missing from the source site.)
(A figure from the original paper is missing from the source site.)
(A figure from the original paper is missing from the source site.)
None of these.
Correct answer
(A figure from the original paper is missing from the source site.)
What is logged to the console after running the following code?
10 30 [30, 40, 50] and 100 0
10 30 [40, 50] and 100 200
10 20 [30, 40, 50] and undefined 0
10 30 [40, 50] and 100 0
Correct answer
10 30 [40, 50] and 100 0
What is logged to the console after running the following code?
Correct answer
Consider the following JavaScript code:
What is the order of console output?
1, 4, 3, 5, 2, 6
1, 4, 3, 5, 6, 2
1, 3, 4, 5, 2, 6
1, 4, 2, 3, 5, 6
Correct answer
1, 4, 3, 5, 2, 6
Match each Vue directive with its correct description:
1–A, 2–D, 3–C, 4–B
1–D, 2–B, 3–C, 4–A
1–B, 2–D, 3–C, 4–A
1–B, 2–C, 3–D, 4–A
Correct answer
1–B, 2–D, 3–C, 4–A
Which of the following is/are the advantage(s) of client-side storage?
Saving web generated documents for offline use.
The data can be stored across devices.
Storing personalized site preferences.
IndexedDB API is a kind of client-side storage which can be used for audio/video files.
Correct answers
Saving web generated documents for offline use.
Storing personalized site preferences.
IndexedDB API is a kind of client-side storage which can be used for audio/video files.
Which of the following are valid capabilities of Lighthouse while analyzing a website?
Measuring performance metrics such as FCP, LCP and TBT
Simulating slow networks and throttled conditions
Automatically fixing accessibility and SEO issues in the source code
Emulating mobile and desktop devices
Correct answers
Measuring performance metrics such as FCP, LCP and TBT
Simulating slow networks and throttled conditions
Emulating mobile and desktop devices
Given the following code, select all the statements that are TRUE about its execution if the code is run in a browser environment.
Correct answers
Consider the following Flask JWT code:
If the JWT token is missing or invalid, Flask-JWT-Extended returns an unauthorized error.
Correct answers
If the JWT token is missing or invalid, Flask-JWT-Extended returns an unauthorized error.
Correct answers
Consider the following code using flask_jwt_extended:
Which of the following statements are correct? (Select all that apply)
Correct answers
Consider the following javascript code:
Note: Each sub question runs on its own, starting from the original 'user' object.
Based on the above data, answer the given subquestions.
What will be logged in the console ?
Rahul 2
Amit 3
Rahul 3
Amit 2
Correct answer
Rahul 3
Consider the following javascript code:
Note: Each sub question runs on its own, starting from the original 'user' object.
Based on the above data, answer the given subquestions.
What will be logged in the console ?
2 3
3 3
2 2
3 2
Correct answer
2 3
Consider the following JavaScript code:
Based on the above data, answer the given subquestions.
What will be the output order?
Start End Data Received
Data Received Start End
Start Data Received End
End Start Data Received
Correct answer
Start Data Received End
Consider the following JavaScript code:
Based on the above data, answer the given subquestions.
Which of the following statements are correct?
Correct answers
Read the following Vue 2 component code carefully (using the Options API via CDN) and answer the given sub questions.
0
1
2
3
Correct answer
1
Read the following Vue 2 component code carefully (using the Options API via CDN) and answer the given sub questions.
0
1
2
3
Correct answer
2
Read the following code carefully and answer the given subquestions. tasks.py:
Called from a view/script:
Checked immediately, right after delay() — worker hasn't processed it yet:
Called separately, after waiting for the worker to finish the task:
What do the two print statements, print(result) and print(type(result)) in the first code block output?
Correct answer
Read the following code carefully and answer the given subquestions. tasks.py:
Called from a view/script:
Checked immediately, right after delay() — worker hasn't processed it yet:
Called separately, after waiting for the worker to finish the task:
What do print(check.status) (checked immediately) and the later print(check.get(timeout=5)) (checked after the worker finishes) output?
"PENDING" and 10
"SUCCESS" and 10
10 and "SUCCESS"
"PENDING" and "SUCCESS"
Correct answer
"PENDING" and 10
Read the following router and component setup carefully and answer the given sub questions: Router setup:
component's method:
/#/product/42
/#/product?id=42
/#/product/:id
/#/42
Correct answer
/#/product/42
Read the following router and component setup carefully and answer the given sub questions: Router setup:
component's method:
/#/search/shoes/2
/#/search?keyword=shoes&page=2
/#/search:keyword=shoes:page=2
/#/search
Correct answer
/#/search?keyword=shoes&page=2
Read the following router and component setup carefully and answer the given sub questions: Router setup:
component's method:
this.$router.query.keyword
this.$route.query.keyword
this.query.keyword
this.$router.params.keyword
Correct answer
this.$route.query.keyword
