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MAD II · All 2025 papers

96 questions · 300 marks · 4 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Modern Application Development II

All 2025 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.
NAT: Numerical response. No negative marking.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

Quiz 1 · 26 Oct 2025 (AN)Quiz 1

Q1MSQ2 Marks·Choose all correct options
Key ↓
Which of the following Vue 2 template syntaxes are valid?
1. A
2. B
3. C
4. D
Q2MSQ2 Marks·Choose all correct options
Key ↓
Which of the following statements about Vue 2 templates are correct?
1. Av-if removes elements from DOM when false
2. Bv-show toggle initiates re-render of the Vue component
3. Cv-bind can bind attributes and class dynamically
4. DVue 2 templates must use double curly braces for all text interpolation
Q3MCQ3 Marks·Choose one option
Key ↓
1. ARahul - Priya - Amit
2. BPriya - Rahul - Amit
3. CAmit - Rahul - Priya
4. DPriya - Amit - Rahul
Q4MCQ3 Marks·Choose one option
Key ↓
1. A['Amit', 'Chirag']
2. B['CHIRAG', 'AMIT']
3. C['AMIT', 'CHIRAG']
4. D['AMIT', 'Bhavna', 'CHIRAG']
Q5MCQ3 Marks·Choose one option
Asked 3 times Key ↓
1. Aclicked picture of Dog
2. Bclicked picture of Deer
3. Cclicked picture of Cat
4. Dclicked picture of undefined
Q6MCQ3 Marks·Choose one option
Key ↓
1. A1-C, 2-D, 3-A, 4-E, 5-B
2. B1-A, 2-C, 3-B, 4-D, 5-E
3. C1-C, 2-A, 3-D, 4-B, 5-E
4. D1-E, 2-A, 3-D, 4-C, 5-B
Q7MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q8MSQ3 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
Q9MSQ3 Marks·Choose all correct options
Key ↓
1. AA
2. BB
3. CC
4. DNone
Q10NAT3 Marks·Write the number
Key ↓
Your answer:
Q11MCQ4.5 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q12MCQ4.5 Marks·Choose one option
Asked 3 times Key ↓
1. A
2. B
3. C
4. D
Q13MSQ4.5 Marks·Choose all correct options
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
5. E
Q14MSQ4.5 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
Read the passage below, then answer Q15–Q16
Q15MCQ2 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q16MSQ2 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D

End Term · 31 Aug 2025 (FN)End Term

Q17MCQ2 Marks·Choose one option
Asked 2 times 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
Q18MCQ2 Marks·Choose one option
Asked 2 times 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
Q19MCQ2 Marks·Choose one option
Asked 2 times 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
Q20MCQ2 Marks·Choose one option
Asked 2 times 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
Q21MSQ2 Marks·Choose all correct options
Asked 2 times 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
Q22MSQ2 Marks·Choose all correct options
Asked 2 times 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
Q23MSQ2 Marks·Choose all correct options
Asked 2 times 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.
Q24MSQ2 Marks·Choose all correct options
Asked 3 times 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
Q25MCQ3 Marks·Choose one option
Asked 2 times 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.
Q26MCQ3 Marks·Choose one option
Asked 2 times 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
Q27MCQ3 Marks·Choose one option
Asked 5 times Key ↓
1. AR P Q S
2. BP R S Q
3. CR P S Q
4. DR S P Q
Q28MCQ3 Marks·Choose one option
Asked 4 times Key ↓
1. A
2. B
3. C
4. D
Q29MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q30MCQ3 Marks·Choose one option
Key ↓
1. Aobject, undefined, true, false
2. Bnull, undefined, false, false
3. Cobject, undefined, false, false
4. Dnull, undefined, true, true
Q31MCQ3 Marks·Choose one option
Key ↓
1. AAdmin component
2. BUnauthorized component
3. CBlank screen
4. DVue throws a routing error
Q32MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Read the passage below, then answer Q33–Q35
Based on the above data, answer the given subquestions.
Q33MCQ3 Marks·Choose one option
Key ↓
After step 2 (selecting two tasks), what is the value of selectedTasks.length?
1. A0
2. B1
3. C2
4. D3
Q34MCQ3 Marks·Choose one option
Key ↓
What happens when the user clicks "Select" on Design UI again (step 3)?
1. AIt is added again, making the total 3
2. BIt replaces the previous task
3. CNothing changes, no duplicate is added
4. DVue throws a warning about duplicate keys
Q35MSQ3 Marks·Choose all correct options
Key ↓
Which of the following statements about this component setup are true?
1. A
2. B
3. C
4. D
Q36MSQ3 Marks·Choose all correct options
Asked 3 times 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
Q37MSQ3 Marks·Choose all correct options
Asked 3 times 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
Q38MSQ3 Marks·Choose all correct options
Asked 2 times 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
Q39MSQ3 Marks·Choose all correct options
Asked 3 times 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.
Q40MCQ4.5 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q41MCQ4.5 Marks·Choose one option
Asked 5 times Key ↓
1. A
2. B
3. C
4. D
Q42MCQ4.5 Marks·Choose one option
Asked 4 times Key ↓
1. A
2. B
3. C
4. D
Q43MCQ4.5 Marks·Choose one option
Asked 2 times 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
Q44MCQ4.5 Marks·Choose one option
Asked 4 times Key ↓
1. A
2. B
3. C
4. D
Q45MCQ4.5 Marks·Choose one option
Key ↓
1. AResult: null
2. BError: HTTP 404, Result: null
3. CError: HTTP 404
4. DUnhandled promise rejection
Q46MCQ4.5 Marks·Choose one option
Asked 2 times Key ↓
Consider the following JavaScript program that demonstrates web storage operations:
1. A
2. B
3. C
4. D
Read the passage below, then answer Q47–Q48
Answer the given subquestions.
Q47MCQ3 Marks·Choose one option
Key ↓
1. AThe password will be stored as plain text "mypassword123" in the database because WTF_CSRF_ENABLED = False
2. BThe password will be hashed using bcrypt with the salt "this-is-a-salt-key" before being stored in the database
3. CThe password will be hashed using SHA-256 algorithm since no specific hashing method is configured
4. DThe password will be encrypted using the SECRET_KEY and stored in the session only
Q48MCQ4.5 Marks·Choose one option
Key ↓
1. A200, 200, 200
2. B200, 401, 403
3. C200, 401, 401
4. D401, 401, 403

End Term · 31 Aug 2025 (AN)End Term

Q49MCQ2 Marks·Choose one option
Asked 2 times 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
Q50MCQ2 Marks·Choose one option
Asked 2 times 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
Q51MCQ2 Marks·Choose one option
Asked 2 times 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
Q52MCQ2 Marks·Choose one option
Asked 2 times 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
Q53MSQ2 Marks·Choose all correct options
Asked 2 times 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
Q54MSQ2 Marks·Choose all correct options
Asked 2 times 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)
Q55MSQ2 Marks·Choose all correct options
Asked 2 times 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.
Q56MSQ2 Marks·Choose all correct options
Asked 3 times 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
Q57MCQ3 Marks·Choose one option
Asked 2 times 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.
Q58MCQ3 Marks·Choose one option
Asked 2 times 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
Q59MCQ3 Marks·Choose one option
Asked 5 times Key ↓
1. AR P Q S
2. BP R S Q
3. CR S P Q
4. DR P S Q
Q60MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q61MCQ3 Marks·Choose one option
Asked 4 times 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
Q62MCQ3 Marks·Choose one option
Key ↓
1. AApp 1 only shows data
2. BBoth show “Hello from App 2”
3. CBoth show “Hello from App 1”
4. DEach renders its own message independently
Q63MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q64MSQ3 Marks·Choose all correct options
Asked 3 times 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
Q65MSQ3 Marks·Choose all correct options
Asked 3 times 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
Q66MSQ3 Marks·Choose all correct options
Asked 2 times 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
Q67MSQ3 Marks·Choose all correct options
Asked 3 times 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.
Read the passage below, then answer Q68–Q70
Scenario
1. The component is loaded.
2. User clicks "Mark Complete" for the task named Build Project.
3. User clicks "Show Completed" button again.
Q68MCQ3 Marks·Choose one option
Key ↓
After step 2 (Mark Completed is clicked), what tasks are shown?
1. ALearn Vue
2. BLearn Vue, Build Project, Test App
3. CTest App only
4. DNone
Q69MCQ3 Marks·Choose one option
Key ↓
After step 3 (Mark Complete is clicked on Build Project), how many completed tasks are reported in the UI?
1. A1
2. B2
3. C3
4. D0
Q70MSQ3 Marks·Choose all correct options
Key ↓
Which of the following are true about this component’s behavior?
1. A
2. B
3. C
4. D
Q71MCQ4.5 Marks·Choose one option
Asked 3 times Key ↓
1. A
2. B
3. C
4. D
Q72MCQ4.5 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q73MCQ4.5 Marks·Choose one option
Asked 3 times Key ↓
1. AUserProfile
2. BUser
3. CNotFound
4. DUserSettings
Q74MCQ4.5 Marks·Choose one option
Key ↓
1. ARequest succeeds
2. BCORS error occurs
3. C404 error
4. DThe server crashes
Q75MCQ4.5 Marks·Choose one option
Asked 3 times Key ↓
1. A
2. B
3. C
4. D
Q76MSQ4.5 Marks·Choose all correct options
Asked 2 times 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
Read the passage below, then answer Q77–Q78
Answer the given Subquestions:
Q77MCQ4.5 Marks·Choose one option
Key ↓
Consider the following Vue Router configuration in a Vue 2 application: In a Vue component, you have these navigation methods: What URLs will be generated when the user clicks each navigation element?
1. AUser button: /user, Product button: /product, Home link: /home
2. BUser button: /user/123, Product button: /product/electronics/456, Home link: /
3. CUser button: /UserProfile/123, Product button: /ProductDetail/electronics/456, Home link: /Home
4. DUser button: /user?id=123, Product button: /product?category=electronics&id=456, Home link: /
Q78MSQ4.5 Marks·Choose all correct options
Key ↓
Using the same Vue Router configuration from the previous question, Select ALL correct statements about these navigation methods.
1. AThe "View User" link will navigate to /user/789 and match the UserProfile route
2. BThe navigateOne() method will create URL /user/555?tab=settings
3. CThe $router.replace() method adds a new entry to the browser history
4. DThe $router.go(-1) method navigates to the previous page in browser history
Read the passage below, then answer Q79–Q80
Prashant and Nikita are creating a quiz question paper collaboratively. They are each working on different sections — and complete their tasks in parallel. Meanwhile, Mayur is enjoying a single- player game that finishes when the game loop ends.
To compare productivity:
● If Prashant and Nikita (together) finish faster than Mayur, the winner is "Team".
● If Mayur finishes faster, he wins.
● If both take the same time, Mayur wins by default.
You are simulating this scenario in the browser.Prashant and Nikita are represented using parallel Promises. Mayur is represented using a single Promise. The frontend must calculate who finishes first using asynchronous logic, and display the result.
Based on the above data, answer the given subquestions.
Q79MCQ3 Marks·Choose one option
Key ↓
If Prashant and Nikita finish together in 3 seconds (since Promise.all waits for both), and Mayur finishes in 4 seconds, who wins?
1. AMayur
2. BTeam
3. CNikita
4. DRace condition prevents output
Q80MCQ3 Marks·Choose one option
Key ↓
The Team takes 5 seconds in total. Mayur takes 2 seconds. According to the logic of app2.js, who is the winner?
1. AMayur
2. BTeam
3. CNikita
4. DError due to async logic

Quiz 2 · 3 Aug 2025 (AN)Quiz 2

Q81MCQ2 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q82MSQ2 Marks·Choose all correct options
Key ↓
Which of the following statements are true?
1. A
2. B
3. C
4. D
Q83MSQ2 Marks·Choose all correct options
Key ↓
Which of the following statement(s) about Web Storage APIs is/are correct?
1. A
2. B
3. C
4. D
Q84MSQ2 Marks·Choose all correct options
Key ↓
Which of the following statement(s) is/are true regarding Single Page Applications (SPA) and Progressive Web Apps (PWA)?
1. ASPAs use client-side routing to dynamically update content without full page reloads.
2. BPWAs can work offline using service workers.
3. CSPAs always require a server-side language to handle routing.
4. DPWAs can be added to a device’s home screen like native apps.
Q85MCQ3 Marks·Choose one option
Key ↓
1. ATotal Score: 80
2. BTotal Score: 90
3. CTotal Score: 120
4. DTotal Score: NaN
Q86MCQ3 Marks·Choose one option
Asked 3 times Key ↓
1. ADashboard only
2. BStats Component only
3. CDashboard Stats Component
4. D404 Not Found
Q87MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q88MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
5. E
Q89MCQ3 Marks·Choose one option
Asked 4 times Key ↓
1. A
2. B
3. C
4. D
5. E
Q90MSQ3 Marks·Choose all correct options
Asked 3 times Key ↓
1. A
2. B
3. C
4. D
5. E
Q91MSQ3 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
5. E
Q92MCQ4.5 Marks·Choose one option
Key ↓
1. ABoth will show Dashboard
2. B1: Dashboard, 2: 404 Not Found
3. C1: Dashboard, 2: Stats Component
4. DBoth will show 404 Not Found
Q93MCQ4.5 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q94MCQ4.5 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Read the passage below, then answer Q95–Q96
You are given the following HTML and JavaScript code that uses Vue 2 via CDN along with Vue Router. Read the code carefully and answer the given subquestions.
Q95MCQ4.5 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q96MCQ3 Marks·Choose one option
Key ↓
Suppose the button is clicked multiple times quickly, the message area flickers unexpectedly. How can you improve the code to ensure proper async behavior and prevent overlapping fetches?
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

Q1A, B, D

Q2A, C

Q3B

Q4C

Q5C

Q6C

Q7D

Q8B, D

Q9A, B, C

Q103

Q11B

Q12A

Q13A, B, D

Q14B, C

Q15B

Q16A, B, C

Q17C

Q18B

Q19B

Q20B

Q21A, C

Q22B, C

Q23B, C

Q24A, C, D

Q25B

Q26D

Q27C

Q28C

Q29A

Q30A

Q31B

Q32A

Q33C

Q34C

Q35A, B, C

Q36A, C, D

Q37A, B, D

Q38B, C, D

Q39A, C, E

Q40A

Q41B

Q42A

Q43B

Q44A

Q45B

Q46A

Q47A

Q48B

Q49B

Q50D

Q51D

Q52D

Q53B, D

Q54C, D

Q55A, D

Q56A, B, C

Q57C

Q58B

Q59D

Q60C

Q61B

Q62D

Q63D

Q64A, B, C

Q65B, C, D

Q66A, B, C

Q67A, B, F

Q68A

Q69B

Q70C, D

Q71B

Q72B

Q73C

Q74B

Q75B

Q76B, C, D

Q77B

Q78B, D

Q79B

Q80A

Q81A

Q82B, C

Q83A, B, C

Q84A, B, D

Q85B

Q86C

Q87B

Q88B

Q89B

Q90A, C, D

Q91A, C, E

Q92D

Q93B

Q94B

Q95B

Q96C

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