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MAD II · All 2024 papers

64 questions · 200 marks · 2 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Modern Application Development II

All 2024 papers

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.

End Term · 22 Dec 2024 (FN)End Term

Q1MCQ3 Marks·Choose one option
Key ↓
Which of the following statements is true about closures in JavaScript?
1. AA closure can access variables from its outer function even after the outer function has returned.
2. BA closure can be created when a function is defined inside another function.
3. CClosures are useful for data encapsulation and controlling access to private data.
4. DAll of these.
Q2MCQ3 Marks·Choose one option
Asked 2 times 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
Q3MCQ3 Marks·Choose one option
Asked 2 times 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
Q4MCQ3 Marks·Choose one option
Asked 2 times 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.
Q5MCQ3 Marks·Choose one option
Asked 2 times 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.
Q6MCQ3 Marks·Choose one option
Asked 2 times 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'
Q7MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A[]
2. B['Laptop', ‘Laptop’, ‘Laptop’]
3. C[{ id: 1, name: 'Laptop' }]
4. D[undefined]
Q8MCQ3 Marks·Choose one option
Asked 2 times 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.
Q9MCQ3 Marks·Choose one option
Key ↓
1. AMultiple state changes in one mutation
2. BAsync operation in mutation
3. CDirect state mutation
4. DBoth Multiple state changes in one mutation and Async operation in mutation
Q10MCQ3 Marks·Choose one option
Key ↓
1. ANo authentication check
2. BSQL injection vulnerability
3. CUnvalidated user input
4. DAll of these
Q11MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q12MCQ3 Marks·Choose one option
Asked 4 times Key ↓
What will be the output on the console?
1. Aerror4
2. B7
3. Cerror
4. Dundefined
Q13MCQ3 Marks·Choose one option
Asked 5 times 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
Q14MCQ3 Marks·Choose one option
Key ↓
Which of the following best describes the difference between @cache.memoize() and @cache.cached() in Flask-Caching?
1. A
2. B
3. C
4. D
Q15MCQ3 Marks·Choose one option
Key ↓
1. AIt will display the indices, values and types of all the items of the array.
2. BIt will throw error on the console for the very first iteration.
3. CIt will display the index, value and type of the value for the first item of array and then will throw error for the next value.
4. DNone of these.
Q16MCQ2 Marks·Choose one option
Asked 2 times 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.
Q17MCQ2 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
5. E
Q18MCQ2 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
5. E
6. F
7. G
Q19MCQ2 Marks·Choose one option
Key ↓
Which of the following statements about the beforeDestroy and destroyed lifecycle hooks in Vue is true?
1. AThe “beforeDestroy” hook is called after the component is removed from the DOM, and the “destroyed” hook is called before the component is destroyed.
2. BThe “beforeDestroy” hook is called before the component is removed from the DOM, and the “destroyed” hook is called after the component is destroyed.
3. CThe “beforeDestroy” hook is called when the component is mounted, and the “destroyed” hook is called before the component is destroyed.
4. DBoth hooks are called after the component is destroyed.
Q20MCQ2 Marks·Choose one option
Asked 3 times Key ↓
1. A5
2. B10
3. C15
4. D20
Q21MCQ2 Marks·Choose one option
Asked 2 times 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
Q22MCQ2 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q23MCQ4.5 Marks·Choose one option
Key ↓
1. AChild Parent GrandParent
2. BChild
3. CGrandParent Parent Child
4. DNone of these
Q24MCQ4.5 Marks·Choose one option
Asked 3 times 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.
Q25MCQ4.5 Marks·Choose one option
Key ↓
1. AParent
2. BButton
3. CButton Parent
4. DParent Button
Q26MCQ4.5 Marks·Choose one option
Key ↓
1. ALikes: 5
2. BLikes: 8
3. CLikes: 6
4. DLikes: 9
Q27MCQ4.5 Marks·Choose one option
Key ↓
1. AThe userData in the store is set to the data from the API.
2. BUser: null
3. CThe error will be logged, Nothing will be displayed
4. DUser: Luke
Q28MCQ4.5 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q29MCQ4.5 Marks·Choose one option
Asked 3 times Key ↓
1. A
2. B
3. C
4. D
Q30MSQ3 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
Q31MSQ4.5 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
Q32MSQ2 Marks·Choose all correct options
Asked 2 times Key ↓
1. Athis.$route.params.id
2. Bthis.$router.params.id
3. Cthis.$route.query.id
4. Dthis.$route.params['id']

End Term · 22 Dec 2024 (AN)End Term

Q33MCQ3 Marks·Choose one option
Asked 2 times 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'
Q34MCQ3 Marks·Choose one option
Asked 2 times 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.
Q35MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q36MCQ3 Marks·Choose one option
Asked 4 times Key ↓
What will be the output on the console?
1. A7
2. Berror
3. Cundefined
4. Derror4
Q37MCQ3 Marks·Choose one option
Asked 5 times 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
Q38MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q39MCQ3 Marks·Choose one option
Asked 2 times 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.
Q40MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q41MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q42MCQ3 Marks·Choose one option
Asked 3 times Key ↓
1. AHome
2. BProfile
3. CSecurity
4. DSettings
Q43MCQ3 Marks·Choose one option
Key ↓
1. AThe new value will be stored in session storage, and the “userName” data property will be updated.
2. BThe new value will be stored in session storage, but the “userName” data property will be reset to an empty string on page refresh.
3. CThe “userName” data property will be reset to an empty string, and the session storage value will be ignored on refresh.
4. DThe “userName” data property will not be updated in session storage because session storage doesn't persist across refreshes.
Q44MCQ3 Marks·Choose one option
Key ↓
1. AII, III, I
2. BIII, I, II
3. CIII, II, I
4. DI, II, III
Q45MCQ2 Marks·Choose one option
Asked 2 times 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
Q46MCQ2 Marks·Choose one option
Asked 2 times 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.
Q47MCQ2 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
5. E
Q48MCQ2 Marks·Choose one option
Key ↓
You have a Celery task send_email that needs to run every 10 minutes. How can you schedule it?
1. AUsing @app.task_periodic to run the task every 10 minutes.
2. BUsing @app.on_periodic to schedule a periodic task.
3. CUsing Celery Beat to schedule periodic tasks.
4. DCelery doesn't support scheduling tasks at fixed intervals; you need to use an external scheduler.
Q49MCQ4.5 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q50MCQ4.5 Marks·Choose one option
Asked 3 times 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.
Q51MCQ4.5 Marks·Choose one option
Asked 2 times 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.
Q52MCQ4.5 Marks·Choose one option
Key ↓
1. A[2, 4, 6]
2. B[2, 4, 6, 8]
3. C[4, 8, 12]
4. D[2, 4, 6, 16]
Q53MCQ4.5 Marks·Choose one option
Key ↓
1. ARequired
2. BInvalid format, Email exists, Required
3. CRequired, Email exists
4. DValidating..., Required
Q54MCQ4.5 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q55MCQ4.5 Marks·Choose one option
Key ↓
1. AThe task will immediately execute and print the result 'Task completed'.
2. BThe task will execute asynchronously, and 'Task completed' will be printed after a 10-second delay.
3. CThe task will execute synchronously, blocking the main thread for 10 seconds.
4. DNone of these
Q56MCQ4.5 Marks·Choose one option
Asked 4 times Key ↓
1. A
2. B
3. C
4. D
Q57MSQ2 Marks·Choose all correct options
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q58MSQ2 Marks·Choose all correct options
Asked 3 times 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.
Q59MSQ2 Marks·Choose all correct options
Key ↓
Which of the following statement(s) is/are correct regarding the behavior of local storage in Vue.js applications?
1. AThe local storage data persists even after the browser is closed and reopened.
2. BThe local storage data is automatically cleared every session.
3. CThe local storage can only store strings, and storing objects requires manual serialization and de-serialization.
4. DVue's reactivity system automatically updates the local storage when bound to a Vue data property.
Q60MSQ2 Marks·Choose all correct options
Asked 3 times 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.
Q61MSQ3 Marks·Choose all correct options
Key ↓
Which of the following statements correctly describe the use of asynchronous messaging systems and frameworks?
1. ACelery allows web servers to offload long-running tasks to worker processes, decoupling task execution from user requests.
2. BPush queues are used for real-time operations, while pull queues are better suited for batch processing.
3. CServer-Sent Events (SSE) provide a persistent connection between server and client, enabling bi-directional communication.
4. DRedis is a high-performance in-memory database that supports Pub/Sub.
Q62MSQ3 Marks·Choose all correct options
Asked 3 times 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.
Q63MSQ3 Marks·Choose all correct options
Key ↓
Which of the following statement(s) is/are true regarding Server-Sent Events (SSE) and WebSockets?
1. ASSE is a two-way communication protocol, while WebSockets are unidirectional.
2. BWebSockets are more suited for scenarios requiring bi-directional communication.
3. CSSE is based on HTTP and can only be used for server-to-client communication, while WebSockets are based on TCP and support both directions.
4. DSSE is an extension of WebSockets, providing enhanced support for server-to- client communication.
Q64MSQ3 Marks·Choose all correct options
Asked 3 times 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.

Official Key

Master Answer Key & Explanations

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

Reveal Key

Q1D

Q2D

Q3D

Q4B

Q5B

Q6A

Q7B

Q8C

Q9B

Q10D

Q11B

Q12A

Q13D

Q14A

Q15C

Q16D

Q17B

Q18B

Q19B

Q20C

Q21C

Q22B

Q23C

Q24B

Q25C

Q26B

Q27D

Q28C

Q29B

Q30B, C

Q31A, B

Q32A, D

Q33C

Q34B

Q35C

Q36D

Q37B

Q38D

Q39A

Q40B

Q41C

Q42C

Q43A

Q44B

Q45B

Q46B

Q47E

Q48C

Q49D

Q50C

Q51A

Q52B

Q53A

Q54D

Q55B

Q56C

Q57C, D

Q58A, C

Q59A, C

Q60A, C

Q61A, B, D

Q62A, D

Q63B, C

Q64A, C

Questions and answer keys are reproduced from the official IIT Madras BS papers. BTechi is not affiliated with IIT Madras.