Modern Application Development II End Term: 13 September 2026, Set 1 (May 2026 term)

1. A

   The header stores the encrypted password used to generate the signature.

2. B

   The signature is generated using the encoded header, encoded payload, and a secret key. If the header is modified, the signature verification fails.

3. C

   The signature only protects the payload section; changes to the header do not affect token validation.

4. D

   The header contains the final signature hash generated after token creation.

1. A

2. B

   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.

3. C

4. D

1. A

   Developer B is correct. SSE cannot transmit JSON data, so structured order status objects cannot be pushed to the browser.

2. B

   Developer B is correct. SSE connections do not reconnect automatically when the network is briefly interrupted, making it unreliable for a live tracker.

3. C

   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.

4. D

   Developer A is correct, but only if WebSockets are set up as a mandatory fallback, since SSE requires HTTP/2 to function.

1. A

   Delhi

2. B

   Indore

3. C

   Rewa

4. D

   Raipur

Select all that apply.

1. A

2. B

3. C

4. D

5. E

   Log 3: throws an error because $el is not yet available

Select all that apply.

1. A

2. B

   If the JWT token is missing or invalid, Flask-JWT-Extended returns an unauthorized error.

3. C

4. D

Select all that apply.

1. A

2. B

3. C

4. D

5. E

6. F

Select all that apply.

1. A

2. B

3. C

4. D

5. E

6. F

Select all that apply.

1. A

   Flask handles one request at a time per worker, so the long-running task blocks the entire process until it finishes.

2. B

   Other users' requests are queued and only served after the heavy task completes, making the app feel unresponsive.

3. C

4. D

   With Celery, Flask immediately returns a response to the user while the report generation and email sending happen inside a separate Celery worker process in the background.

Select all that apply.

1. A

   Saving web generated documents for offline use.

2. B

   Storing personalized site preferences.

3. C

   The data can be stored across devices.

4. D

   IndexedDB API is a kind of client-side storage which can be used for audio/video files.

Select all that apply.

1. A

   Measuring performance metrics such as FCP, LCP and TBT

2. B

   Simulating slow networks and throttled conditions

3. C

   Emulating mobile and desktop devices

4. D

   Automatically fixing accessibility and SEO issues in the source code

Select all that apply.

1. A

2. B

3. C

4. D

1. A

   Redis is used by Flask-SSE to authenticate connected users before events can be streamed to the browser.

2. B

   Flask-SSE uses Redis as a shared event channel so published messages can be delivered to connected clients.

3. C

   Redis is only needed when SSE events must be stored permanently and replayed after reconnection.

4. D

   Redis is optional in Flask-SSE and is only recommended when the application has a very large number of concurrent users.

1. A

   1-C, 2-D, 3-A, 4-B

2. B

   1-B, 2-C, 3-D, 4-A

3. C

   1-A, 2-D, 3-B, 4-C

4. D

   1-C, 2-B, 3-A, 4-D

1. A

   1-C, 2-B, 3-D, 4-A

2. B

   1-B, 2-C, 3-A, 4-D

3. C

   1-C, 2-D, 3-B, 4-A

4. D

   1-A, 2-B, 3-D, 4-C

1. A

2. B

3. C

4. D

1. A

2. B

3. C

4. D

1. A

   (A figure from the original paper is missing from the source site.)

2. B

   (A figure from the original paper is missing from the source site.)

3. C

   (A figure from the original paper is missing from the source site.)

4. D

   None of these.

1. A

   10 30 [40, 50] and 100 0

2. B

   10 30 [40, 50] and 100 200

3. C

   10 20 [30, 40, 50] and undefined 0

4. D

   10 30 [30, 40, 50] and 100 0

1. A

2. B

3. C

   Both return null

4. D

1. A

   Temperature: 28oC, Status: Normal

2. B

   Temperature: 33oC, Status: Hot

3. C

   Temperature: 33oC, Status: Normal

4. D

   Temperature: 35oC, Status: Normal

1. A

   Because Vue automatically watches all methods

2. B

   Because the Vuex mutation changes the state used by the computed property

3. C

   Because getters directly trigger watchers

4. D

   Because computed properties cannot access Vuex state

1. A

   Normal: Rahul Arrow: Rahul

2. B

   Normal: Arrow: Rahul

3. C

   Normal: Rahul Arrow: undefined

4. D

   Normal: Arrow:

Select all that apply.

1. A

2. B

3. C

4. D

1. A

   "Hello"

2. B

   "Click Me"

3. C

   "" (empty)

4. D

   undefined

1. A

   "Hello"

2. B

   "Click Me"

3. C

   "Button clicked"

4. D

   undefined

1. A

   15 and 30

2. B

   18 and 36

3. C

   15 and 20

4. D

   10 and 20

1. A

   Mutations can contain asynchronous code; actions cannot

2. B

   Only actions can call commit; mutations cannot

3. C

   Mutations must be synchronous; actions can contain async logic and then commit mutations

4. D

   There is no real difference; both are interchangeable

Select all that apply.

1. A

   d1.speak() returns "Tommy barks"

2. B

   d1.speak() returns "Tommy makes a sound"

3. C

   Animal.count returns 2

4. D

   Animal.count returns 1

Select all that apply.

1. A

   d1 instanceof Animal returns true

2. B

   d1 instanceof Animal returns false

3. C

   Dog.create("Tommy") creates an instance of Dog, but not Animal

4. D

   Dog.create("Tommy") creates an instance of Dog as well as Animal