Which of the following is a popular JavaScript library for building user interfaces? MCQ with Answer and Explanation

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Which of the following is a popular JavaScript library for building user interfaces?

A. Angular

B. React

C. All of the above

D. Vue.js

Answer: Option C

Solution (By JKSSB Mock Tests)

React, Angular, and Vue.js are all popular JavaScript frameworks/libraries for building front-end user interfaces.

This question belongs to: Computer Internet and Web Technologies

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What is the role of the 'alt' attribute in an HTML img tag?

A. To define image dimensions

B. To specify alternative text for accessibility and when image fails to load

C. To add a tooltip

D. To set the image source

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Correct Answer: Option B

Explanation:
The alt attribute provides a text alternative for an image, improving accessibility and providing fallback content if the image cannot be displayed.

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Question #2

Which specific protocol operates inside email infrastructures to provide secure, encrypted message transfers between independent mail servers over port 465 or 587?

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Correct Answer: Option A

Explanation:
Secure SMTP variants utilize cryptographic SSL/TLS layers to encrypt email transmissions between mail servers, preventing eavesdropping and data tampering.

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Question #3

What is the function of a DNS server?

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Correct Answer: Option B

Explanation:
DNS (Domain Name System) servers resolve human-readable domain names (e.g., www.example.com) to numerical IP addresses (e.g., 192.0.2.1) required for network routing.

This question belongs to: Computer Internet and Web Technologies

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