BTechibtechi.in
Loading Loading
Free IIT Madras BS notes, PYQs and mock tests at btechi.in

MAD II · Most repeated questions

93 questions · 281 marks · 6 papers · 39 question types

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Modern Application Development II

Most repeated questions

Official Paper

Examination Instructions & Guidelines

Solve on notebook/paper first before checking solutions.
MCQ: Exactly 1 option is correct. Negative marking applies.
MSQ: One or more options correct. Select all to score.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

Type 1 · asked 5 times · Promises, async/await & event loop

Order the console output of an async function that uses await

Q1MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. ABegin, Start, 5, End, Finish
2. BBegin, Start, Finish, 5, End
3. CBegin, Finish, Start, 5, End
4. DBegin, Finish, Start, End, 5
Q2MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. ABegin, Start, 5, End, Finish
2. BBegin, Finish, Start, 5, End
3. CBegin, Finish, Start, End, 5
4. DBegin, Start, Finish, 5, End
Q3MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
1. AR P Q S
2. BP R S Q
3. CR S P Q
4. DR P S Q
Q4MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. AR P Q S
2. BP R S Q
3. CR P S Q
4. DR S P Q
Q5MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. A
2. B
3. C
4. D

Type 2 · asked 4 times · Promises, async/await & event loop

Trace a promise chain with throw and catch to find the logged output

Q6MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
What will be the output on the console?
1. A7
2. Berror
3. Cundefined
4. Derror4
Q7MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
What will be the output on the console?
1. Aerror4
2. B7
3. Cerror
4. Dundefined
Q8MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
Consider the following javascript program. What will be the output of the above program on the browser’s console?
1. A
2. B
3. C
4. D
Q9MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. A
2. B
3. C
4. D

Type 3 · asked 4 times · Vue components, slots & lifecycle

Trace data changes in beforeCreate and created hooks

Q10MCQ4.5 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q11MCQ3 Marks·Choose one option
Quiz 2 · 3 Aug 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
5. E
Q12MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. A
2. B
3. C
4. D
Q13MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. A
2. B
3. C
4. D

Type 4 · asked 3 times · Vuex state management

Behaviour when dispatching an async Vuex action that commits later

Q14MCQ4.5 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. AThe increment mutation will be called immediately after the dispatch.
2. BThe incrementAsync action will be executed synchronously, and increment will be committed before the promise resolves.
3. CThe state will be updated after the asynchronous operation completes.
4. DThe action will be skipped since mutations cannot be called inside actions.
Q15MCQ4.5 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. AThe increment mutation will be called immediately after the dispatch.
2. BThe state will be updated after the asynchronous operation completes.
3. CThe incrementAsync action will be executed synchronously, and increment will be committed before the promise resolves.
4. DThe action will be skipped since mutations cannot be called inside actions.
Q16MSQ3 Marks·Choose all correct options
Quiz 2 · 3 Aug 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
5. E

Type 5 · asked 3 times · Vue directives & templates

Decide which classes v-bind:class applies to an element

Q17MSQ2 Marks·Choose all correct options
End Term · 22 Dec 2024 (AN)Key ↓
1. AThe class, namely “classB” will always be applied to the div element.
2. BThe classes, namely “classA” and “classB” will always be applied to the div element.
3. CThe class, namely “classA” will only be applied to the div element, if the variable “isClassA” evaluates to true.
4. DThe class, namely “classB” will only be applied to the div element, if no variable with name “isClassA” exists.
Q18MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
1. AThe class "active" will only be applied to the div element if the variable "isActive" evaluates to true.
2. BThe class "disabled" will be applied to the div element when the variable "isEnabled" evaluates to false.
3. CThe class "text-bold" will always be applied to the div element regardless of the "hasBoldText" variable value.
4. DAll three classes ("active", "text-bold", "disabled") will always be applied to the div element.
5. EIf "isEnabled" is undefined, the "disabled" class will not be applied to the div element.
6. FThe class "text-bold" will only be applied if the variable "hasBoldText" exists and evaluates to a truthy value.
Q19MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
1. AThe class "active" will only be applied to the div element if the variable "isActive" evaluates to true.
2. BThe class "text-bold" will always be applied to the div element regardless of the "hasBoldText" variable value.
3. CThe class "disabled" will be applied to the div element when the variable "isEnabled" evaluates to false.
4. DAll three classes ("active", "text-bold", "disabled") will always be applied to the div element.
5. EThe class "text-bold" will only be applied if the variable "hasBoldText" exists and evaluates to a truthy value.
6. FIf "isEnabled" is undefined, the "disabled" class will not be applied to the div element.

Type 6 · asked 3 times · Vue Router

Find which component renders for a URL given the routes list

Q20MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. AHome
2. BProfile
3. CSecurity
4. DSettings
Q21MCQ3 Marks·Choose one option
Quiz 2 · 3 Aug 2025 (AN)Key ↓
1. ADashboard only
2. BStats Component only
3. CDashboard Stats Component
4. D404 Not Found
Q22MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
1. AUserProfile
2. BUser
3. CNotFound
4. DUserSettings

Type 7 · asked 3 times · Celery, queues, webhooks & SSE

Pick true statements about Celery background tasks

Q23MSQ3 Marks·Choose all correct options
End Term · 22 Dec 2024 (AN)Key ↓
Which of the following is/are typical use case(s) for Celery tasks?
1. AProcessing time-consuming or resource-intensive background jobs asynchronously.
2. BDirectly handling incoming HTTP requests in web servers.
3. CScheduling periodic tasks like sending emails or cleaning up the database.
4. DServing real-time notifications over WebSockets.
Q24MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Which statements are true about handling background tasks in Flask with Celery?
1. AUsing time.sleep() blocks the event loop and is recommended for async tasks
2. BCelery allows long-running tasks to be executed asynchronously
3. CPolling is a strategy to check task status periodically
4. DFlask + Celery + Redis is a common stack for async task management
Q25MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
Which statements are true about handling background tasks in Flask with Celery?
1. ACelery allows long-running tasks to be executed asynchronously
2. BPolling is a strategy to check task status periodically
3. CUsing time.sleep() blocks the event loop and is recommended for async tasks
4. DFlask + Celery + Redis is a common stack for async task management

Type 8 · asked 3 times · Celery, queues, webhooks & SSE

Pick true statements about webhooks

Q26MSQ3 Marks·Choose all correct options
End Term · 22 Dec 2024 (AN)Key ↓
Which of the following statement(s) is/are true about Webhooks?
1. AA Webhook is a method for a server to send real-time data to another server as an HTTP POST request.
2. BWebhooks are typically used for sending periodic updates at regular intervals.
3. CA client must continuously poll a Webhook URL to receive data.
4. DWebhooks are usually used in event-driven architectures, where an event triggers an HTTP POST request to a specified endpoint.
Q27MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Which statements about webhooks are correct?
1. AThey enable real-time data delivery
2. BThey use HTTP POST requests typically
3. CThey're designed for server-to-server communication
4. DThey require polling from the client
Q28MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
Which statements about webhooks are correct?
1. AThey enable real-time data delivery
2. BThey require polling from the client
3. CThey use HTTP POST requests typically
4. DThey're designed for server-to-server communication

Type 9 · asked 3 times · Caching & page performance

Pick the Lighthouse performance metrics

Q29MSQ2 Marks·Choose all correct options
End Term · 22 Dec 2024 (AN)Key ↓
Which of the following statements are true about Lighthouse?
1. ALighthouse measures various performance metrics, including Time to Interactive and Speed Index.
2. BLighthouse generates a single score for UI design only.
3. CIt can emulate network throttling and device types during performance evaluation.
4. DLighthouse focuses exclusively on performance and ignores accessibility.
Q30MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Which factors directly impact the Lighthouse "Performance" score?
1. AFirst Contentful Paint (FCP)
2. BTime to Interactive (TTI)
3. CLayout Shift
4. DHTTPS usage
Q31MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
Which factors directly impact the Lighthouse "Performance" score?
1. AFirst Contentful Paint (FCP)
2. BHTTPS usage
3. CTime to Interactive (TTI)
4. DLayout Shift

Type 10 · asked 3 times · JS functions, closures & this

Trace output of a closure that captures an outer variable

Q32MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. A5
2. B10
3. C15
4. D20
Q33MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
Q34MCQ3 Marks·Choose one option
Quiz 1 · 26 Oct 2025 (AN)Key ↓
1. Aclicked picture of Dog
2. Bclicked picture of Deer
3. Cclicked picture of Cat
4. Dclicked picture of undefined

Type 11 · asked 3 times · JS functions, closures & this

Trace this inside arrow vs regular methods of nested objects

Q35MCQ4.5 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. A
2. B
3. C
4. D
Q36MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
Q37MCQ4.5 Marks·Choose one option
Quiz 1 · 26 Oct 2025 (AN)Key ↓
1. A
2. B
3. C
4. D

Type 12 · asked 2 times · Web security, auth & CORS

Choose secure and samesite values so a cookie is HTTPS-only and same-site

Q38MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. Asecure=False and samesite='Strict'
2. Bsecure=True and samesite='None'
3. Csecure=True and samesite='Strict'
4. Dsecure=False and samesite='Lax'
Q39MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. Asecure=True and samesite='Strict'
2. Bsecure=False and samesite='Strict'
3. Csecure=True and samesite='None'
4. Dsecure=False and samesite='Lax'

Type 13 · asked 2 times · Celery, queues, webhooks & SSE

Pick the true statement about long polling

Q40MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
Which of the following is true regarding long polling?
1. ALong polling opens multiple connections between the client and the server, and the server continuously sends updates to the client in real-time.
2. BLong polling allows the client to make a single request to the server, where the server holds the connection open until new data is available and then sends the response.
3. CLong polling involves the client repeatedly sending requests at fixed intervals to the server to check for updates, regardless of whether new data is available.
4. DLong polling uses WebSockets to maintain a persistent, bidirectional connection between the client and the server.
Q41MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
Which of the following is true regarding long polling?
1. ALong polling opens multiple connections between the client and the server, and the server continuously sends updates to the client in real-time.
2. BLong polling involves the client repeatedly sending requests at fixed intervals to the server to check for updates, regardless of whether new data is available.
3. CLong polling allows the client to make a single request to the server, where the server holds the connection open until new data is available and then sends the response.
4. DLong polling uses WebSockets to maintain a persistent, bidirectional connection between the client and the server.

Type 14 · asked 2 times · Vue components, slots & lifecycle

Choose the correct named/scoped slot usage for a child component

Q42MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q43MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. A
2. B
3. C
4. D

Type 15 · asked 2 times · Promises, async/await & event loop

Order output of setTimeout(0) vs Promise.then callbacks

Q44MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q45MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. AStart Inside Timeout Inside Promise End
2. BStart Inside Promise Inside Timeout End
3. CStart End Inside Timeout Inside Promise
4. DStart End Inside Promise Inside Timeout

Type 16 · asked 2 times · JS objects, arrays, classes & DOM

Output after deleting a prototype method from an object

Q46MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q47MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. AHello, John TypeError: john.greet is not a function
2. BHello, John Hello, undefined
3. CTypeError: john.greet is not a function TypeError: john.greet is not a function
4. DHello, John Hello, John

Type 17 · asked 2 times · Promises, async/await & event loop

Find the false statement about async and await

Q48MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
Which of the following statements is false when using the “async” and “await” keywords in JavaScript?
1. AThe “await” keyword can only be used inside an async function.
2. BThe async functions run synchronously, but their await statements execute asynchronously.
3. CThe “await” keyword pauses the execution of the surrounding async function until the promise resolves.
4. DThe async functions always return a promise, even if the return value is not a promise.
Q49MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
Which of the following statements is false when using the “async” and “await” keywords in JavaScript?
1. AThe “await” keyword can only be used inside an async function.
2. BThe “await” keyword pauses the execution of the surrounding async function until the promise resolves.
3. CThe async functions always return a promise, even if the return value is not a promise.
4. DThe async functions run synchronously, but their await statements execute asynchronously.

Type 18 · asked 2 times · JS functions, closures & this

Output when an object method is called detached from its object (this lost)

Q50MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
5. E
Q51MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. A
2. B
3. C
4. D
5. E

Type 19 · asked 2 times · Web security, auth & CORS

Effect of CSP default-src 'self' on an external script

Q52MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q53MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. A
2. B
3. C
4. D

Type 20 · asked 2 times · Vue directives & templates

What v-if/v-else shows after the condition changes

Q54MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. AThe paragraph with the text “This paragraph is hidden” will be displayed.
2. BThe paragraph with the text “This paragraph is visible” will be displayed.
3. CBoth paragraphs will be displayed because of the v-if and v-else bindings.
4. DNo change will happen, since v-if and v-else do not update the DOM.
Q55MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. AThe paragraph with the text “This paragraph is visible” will be displayed.
2. BThe paragraph with the text “This paragraph is hidden” will be displayed.
3. CBoth paragraphs will be displayed because of the v-if and v-else bindings.
4. DNo change will happen since v-if and v-else do not update the DOM.

Type 21 · asked 2 times · Web storage, fetch & PWAs

Find the false statement about caching headers and web storage

Q56MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
Which of the following statements is FALSE?
1. ACache-Control: no-store prevents caching
2. BData stored in sessionStorage remains available even after the browser is closed and reopened.
3. CETag helps validate cache freshness
4. DlocalStorage has larger storage limit than cookies
Q57MCQ2 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
Which of the following statements is FALSE?
1. ACache-Control: no-store prevents caching
2. BETag helps validate cache freshness
3. CData stored in sessionStorage remains available even after the browser is closed and reopened.
4. DlocalStorage has larger storage limit than cookies

Type 22 · asked 2 times · Web storage, fetch & PWAs

Final localStorage cart output after page refreshes

Q58MCQ4.5 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q59MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. A[]
2. B['Laptop', ‘Laptop’, ‘Laptop’]
3. C[{ id: 1, name: 'Laptop' }]
4. D[undefined]

Type 23 · asked 2 times · Vue reactivity, computed & watchers

Does a deep watcher fire when a nested property changes

Q60MCQ4.5 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. AThe watcher will be triggered and log "User object changed: { name: 'Bob', age: 30 }".
2. BThe watcher will not be triggered because “name” is a nested property of “user” object.
3. CThe watcher will be triggered, but it will only log the new “name” value, i.e., “Dev”, and not the entire user object.
4. DThe watcher will throw an error because deep watching is not supported on nested objects.
Q61MCQ3 Marks·Choose one option
End Term · 22 Dec 2024 (FN)Key ↓
1. AThe watcher will not be triggered because “name” is a nested property of “user” object.
2. BThe watcher will be triggered and log "User object changed: { name: 'Bob', age: 30 }".
3. CThe watcher will be triggered, but it will only log the new “name” value, i.e., “Dev”, and not the entire user object.
4. DThe watcher will throw an error because deep watching is not supported on nested objects.

Type 24 · asked 2 times · Vue Router

Access a dynamic route param (:id) inside a component

Q62MSQ2 Marks·Choose all correct options
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q63MSQ2 Marks·Choose all correct options
End Term · 22 Dec 2024 (FN)Key ↓
1. Athis.$route.params.id
2. Bthis.$router.params.id
3. Cthis.$route.query.id
4. Dthis.$route.params['id']

Type 25 · asked 2 times · Caching & page performance

Predict cache hits and response timing for a Flask-Caching decorated route

Q64MCQ4.5 Marks·Choose one option
End Term · 22 Dec 2024 (AN)Key ↓
1. A
2. B
3. C
4. D
Q65MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
If requests for user IDs 1, 2, 1 are made within 5 minutes, what's the total response time?
1. A15 seconds
2. B10 seconds
3. C5 seconds
4. D0 seconds

Type 26 · asked 2 times · Celery, queues, webhooks & SSE

What happens when a queue consumer is slower than the producer

Q66MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
In a message queue system, if the consumer is slower than the producer, what is likely to occur first?
1. AMessages will be dropped
2. BMessages will accumulate in the queue
3. CThe consumer will speed up automatically
4. DThe producer will block until the consumer is ready
Q67MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
In a message queue system, if the consumer is slower than the producer, what is likely to occur first?
1. AMessages will be dropped
2. BThe producer will block until the consumer is ready
3. CMessages will accumulate in the queue
4. DThe consumer will speed up automatically

Type 27 · asked 2 times · Vue reactivity, computed & watchers

Meaning of reactivity in Vue.js

Q68MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
What does "reactivity" mean in the context of frontend frameworks like Vue.js?
1. AThe component will reload when data changes
2. BAll function calls become asynchronous
3. CIt disables direct access to state
4. DThe DOM updates automatically when the underlying reactive data changes
Q69MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. AThe component will reload when data changes
2. BThe DOM updates automatically when the underlying reactive data changes
3. CAll function calls become asynchronous
4. DIt disables direct access to state

Type 28 · asked 2 times · Caching & page performance

Main benefit of Flask @cache.cached()

Q70MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
In Flask, what is the main benefit of using the @cache.cached() decorator?
1. AIt stores output in session storage
2. BIt enables token authentication
3. CIt sends compressed response headers
4. DIt skips route execution for repeated inputs
Q71MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
In Flask, what is the main benefit of using the @cache.cached() decorator?
1. AIt stores output in session storage
2. BIt skips route execution for repeated inputs
3. CIt enables token authentication
4. DIt sends compressed response headers

Type 29 · asked 2 times · Web security, auth & CORS

Primary purpose of CORS

Q72MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
What is the primary purpose of CORS (Cross-Origin Resource Sharing)?
1. ATo encrypt data between client and server
2. BTo compress HTTP responses
3. CTo authenticate users across applications
4. DTo control which domains can access resources
Q73MCQ2 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
What is the primary purpose of CORS (Cross-Origin Resource Sharing)?
1. ATo encrypt data between client and server
2. BTo control which domains can access resources
3. CTo compress HTTP responses
4. DTo authenticate users across applications

Type 30 · asked 2 times · Web security, auth & CORS

Practices that protect against supply chain attacks

Q74MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Which of the following practices help protect against supply chain attacks?
1. AStoring keys only in environment variables
2. BVersion pinning
3. CUsing only packages with over 1000 stars on GitHub
4. DReduce Dependencies
Q75MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
Which of the following practices help protect against supply chain attacks?
1. AVersion pinning
2. BStoring keys only in environment variables
3. CReduce Dependencies
4. DUsing only packages with over 1000 stars on GitHub

Type 31 · asked 2 times · Caching & page performance

Factors that affect web page load speed

Q76MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Which of the following factors directly affect the speed and performance of a web page load?
1. AThe number of CSS selectors in the stylesheet
2. BUse of semantic HTML tags
3. CNumber of HTTP requests made
4. DFile size of resources (like images, JS)
Q77MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
Which of the following factors directly affect the speed and performance of a web page load?
1. AThe number of CSS selectors in the stylesheet
2. BNumber of HTTP requests made
3. CFile size of resources (like images, JS)
4. DUse of semantic HTML tags

Type 32 · asked 2 times · Celery, queues, webhooks & SSE

Benefits of using a message broker

Q78MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Which of the following is/are the potential benefits of using a message broker?
1. AA message broker makes the network scalable for adding more servers to the network.
2. BA message broker allows two servers in a network to directly communicate with each other, without an intermediary.
3. CA message broker is not suited in case of traffic spikes, as messages are retained in the queue until processed.
4. DA message broker can be used for batch processing of messages.
Q79MSQ2 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
Which of the following is/are the potential benefits of using a message broker?
1. AA message broker allows two servers in a network to directly communicate with each other, without an intermediary.
2. BA message broker makes the network scalable for adding more servers to the network.
3. CA message broker can be used for batch processing of messages.
4. DA message broker is not suited in case of traffic spikes, as messages are retained in the queue until processed.

Type 33 · asked 2 times · Celery, queues, webhooks & SSE

Are webhooks right for notifying third-party services on an order

Q80MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
A popular e-commerce platform needs to notify multiple third-party services (inventory management, email marketing, analytics) whenever a customer places an order. The development team is considering different approaches to handle these notifications. Scenario: When an order is placed, the system needs to: ● Update inventory levels in an external warehouse system ● Send a welcome email through a third-party email service ● Log analytics data to an external tracking service ● Update customer loyalty points in a CRM system Which of the following statements about using webhooks for this scenario is MOST accurate?
1. AWebhooks are not suitable for this use case because they require the e- commerce platform to continuously poll each third-party service to check if they're ready to receive data, which would create unnecessary network overhead.
2. BWebhooks should be avoided in this scenario because they operate synchronously, meaning the customer's order placement would be delayed until all third-party services have successfully processed their notifications.
3. CWebhooks provide an ideal solution as they allow the e-commerce platform to push real-time notifications to all subscribed third-party services immediately when an order is placed, eliminating the need for these services to repeatedly poll for updates.
4. DWebhooks are primarily designed for read-only operations and cannot handle complex data payloads like order information, making them unsuitable for e-commerce transaction notifications.
Q81MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
A popular e-commerce platform needs to notify multiple third-party services (inventory management, email marketing, analytics) whenever a customer places an order. The development team is considering different approaches to handle these notifications. Scenario: When an order is placed, the system needs to: ● Update inventory levels in an external warehouse system ● Send a welcome email through a third-party email service ● Log analytics data to an external tracking service ● Update customer loyalty points in a CRM system Which of the following statements about using webhooks for this scenario is MOST accurate?
1. AWebhooks are not suitable for this use case because they require the e- commerce platform to continuously poll each third-party service to check if they're ready to receive data, which would create unnecessary network overhead.
2. BWebhooks provide an ideal solution as they allow the e-commerce platform to push real-time notifications to all subscribed third-party services immediately when an order is placed, eliminating the need for these services to repeatedly poll for updates.
3. CWebhooks should be avoided in this scenario because they operate synchronously, meaning the customer's order placement would be delayed until all third-party services have successfully processed their notifications.
4. DWebhooks are primarily designed for read-only operations and cannot handle complex data payloads like order information, making them unsuitable for e-commerce transaction notifications.

Type 34 · asked 2 times · Caching & page performance

Main advantage of caching in a Flask app

Q82MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
What is the main advantage of using caching in a Flask-based web application?
1. AIt eliminates the need for client-side rendering
2. BIt reduces server load by reusing responses for repeated requests
3. CIt encrypts data transmission between server and client
4. DIt avoids the need for database interactions completely
Q83MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
What is the main advantage of using caching in a Flask-based web application?
1. AIt eliminates the need for client-side rendering
2. BIt encrypts data transmission between server and client
3. CIt avoids the need for database interactions completely
4. DIt reduces server load by reusing responses for repeated requests

Type 35 · asked 2 times · JS objects, arrays, classes & DOM

Output of object destructuring with rest and renamed keys

Q84MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
Q85MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. A
2. B
3. C
4. D

Type 36 · asked 2 times · Vuex state management

True statements about Vuex mutations vs actions

Q86MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Which of the following are true about mutations and actions in Vuex?
1. AActions can be asynchronous
2. BOnly actions can call APIs through fetch call
3. CMutations should modify state directly
4. DMutations can be asynchronous
Q87MSQ3 Marks·Choose all correct options
End Term · 31 Aug 2025 (FN)Key ↓
Which of the following are true about mutations and actions in Vuex?
1. AMutations can be asynchronous
2. BActions can be asynchronous
3. COnly actions can call APIs through fetch call
4. DMutations should modify state directly

Type 37 · asked 2 times · JS objects, arrays, classes & DOM

Trace class inheritance with super and overridden methods

Q88MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
1. A
2. B
3. C
4. D
Q89MSQ4.5 Marks·Choose all correct options
Quiz 1 · 26 Oct 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
5. E

Type 38 · asked 2 times · Vue components, slots & lifecycle

Work out what named and scoped slots render in a parent component

Q90MCQ4.5 Marks·Choose one option
Quiz 2 · 3 Aug 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
Q91MSQ4.5 Marks·Choose all correct options
End Term · 31 Aug 2025 (AN)Key ↓
Assuming that the root Vue instance has already been created and mounted to div app. Which of the following statements are CORRECT?
1. AThe header slot will display "Welcome John" when loading is true
2. BThe content slot will render 3 list items with "item1 (3 total)", "item2 (3 total)", "item3 (3 total)"
3. CThe default slot will display "No data available" from the fallback prop
4. DIf we change isLoading: true in data-provider, the header will show "Loading..."
5. EChanging v-slot:default to just v-slot in parent-component would break the functionality

Type 39 · asked 2 times · Web storage, fetch & PWAs

Trace localStorage and sessionStorage values after set, get and remove

Q92MCQ3 Marks·Choose one option
End Term · 31 Aug 2025 (AN)Key ↓
1. A
2. B
3. C
4. D
Q93MCQ4.5 Marks·Choose one option
End Term · 31 Aug 2025 (FN)Key ↓
Consider the following JavaScript program that demonstrates web storage operations:
1. A
2. B
3. C
4. D

Official Key

Master Answer Key & Explanations

Official answer keys from IIT Madras BS past papers. Click any question to review.

Reveal Key

Q1B

Q2D

Q3D

Q4C

Q5B

Q6D

Q7A

Q8B

Q9A

Q10C

Q11B

Q12C

Q13A

Q14C

Q15B

Q16A, C, D

Q17A, C

Q18A, B, F

Q19A, C, E

Q20C

Q21C

Q22C

Q23A, C

Q24B, C, D

Q25A, B, D

Q26A, D

Q27A, B, C

Q28A, C, D

Q29A, C

Q30A, B, C

Q31A, C, D

Q32C

Q33B

Q34C

Q35B

Q36B

Q37A

Q38C

Q39A

Q40B

Q41C

Q42C

Q43B

Q44B

Q45D

Q46C

Q47D

Q48B

Q49D

Q50E

Q51B

Q52D

Q53B

Q54A

Q55B

Q56B

Q57C

Q58D

Q59B

Q60A

Q61B

Q62C, D

Q63A, D

Q64D

Q65B

Q66B

Q67C

Q68D

Q69B

Q70D

Q71B

Q72D

Q73B

Q74B, D

Q75A, C

Q76C, D

Q77B, C

Q78A, D

Q79B, C

Q80C

Q81B

Q82B

Q83D

Q84C

Q85A

Q86A, B, C

Q87B, C, D

Q88A

Q89A, B, D

Q90B

Q91B, C, D

Q92D

Q93A

Questions and answer keys are reproduced from the official IIT Madras BS papers. Topics and repeated question types are BTechi’s own grouping. BTechi is not affiliated with IIT Madras.