What is the operational goal of a web browser's 'JavaScript Engine' (such as Google's V8 engine inside Chrome)? MCQ with Answer and Explanation

Question
What is the operational goal of a web browser's 'JavaScript Engine' (such as Google's V8 engine inside Chrome)?
A. To route incoming email attachments through proxy servers
B. To parse, interpret, compile, and execute JavaScript code scripts rapidly into machine instructions natively within the browser client
C. To render structural CSS layout designs cleanly
D. To manage physical fiber optic cable transmissions
Answer: Option B
Solution (By JKSSB Mock Tests)
The JavaScript engine is a specialized component that executes interactive client-side programming code, dynamically modifying the webpage UI based on user actions.
This question belongs to: Computer Internet and Web Technologies
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Question #1
Which type of software vulnerability involves an attacker injecting malicious scripts into trusted websites, which are then executed by unsuspecting client web browsers?
A. SQL Injection
B. Cross-Site Scripting (XSS)
C. Buffer Overflow
D. Denial of Service (DoS)
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Correct Answer: Option B

Explanation:
Cross-Site Scripting (XSS) is a security vulnerability where malicious script blocks are injected into reliable web templates, running malicious scripts directly inside client browsers.
This question belongs to: Computer Internet and Web Technologies
Question #2
Which specific protocol operates at the Transport Layer of the TCP/IP stack to guarantee reliable, ordered, and error-checked delivery of stream data over web connections?
A. TCP
B. UDP
C. IP
D. ICMP
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Correct Answer: Option A

Explanation:
TCP (Transmission Control Protocol) provides reliable, connection-oriented packet deliveries, ensuring all data segments arrive intact and in sequential order.
This question belongs to: Computer Internet and Web Technologies
Question #3
What mechanism does a browser use to verify the cryptographic identity and authenticity of an HTTPS website during an initial connection handshake?
A. It alters network configurations via DHCP scripts.
B. It reviews local text browser history traces.
C. It evaluates the site's digital SSL/TLS Certificate issued by a trusted Certificate Authority (CA).
D. It queries standard local email mailboxes via POP3 paths.
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Correct Answer: Option C

Explanation:
Browsers verify a website's authenticity by checking its digital certificate, which must be cryptographically signed by a recognized, trusted Certificate Authority (CA).
This question belongs to: Computer Internet and Web Technologies
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