3812+ MCQ Questions in english

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3812+ MCQ Questions in english हिन्दी

3392. Two-factor authentication adds:

A. Extra password

B. Time requirement

C. Second form of identity verification

D. Captcha

Enhances account security (e.g. code + password).

3391. A firewall is used to:

A. Encrypt data

B. Filter incoming/outgoing network traffic

C. Host websites

D. Manage memory

Network security barrier

3390. Phishing is:

A. Malware

B. Social engineering attack

C. Security patch

D. Antivirus software

deceitful emails/websites to steal info.

3389. What does VPN do?

A. Speeds up internet

B. Creates encrypted private network over public internet

C. Scans for viruses

D. Manages web cookies

Protects privacy via secure tunneled connection.

3388. Which is a symmetric encryption algorithm?

A. RSA

B. AES

C. Diffie-Hellman

D. ECC

AES — same key for encryption/decryption.

3387. DNS maps:

A. IP → MAC

B. Port → Service

C. Domain names → IP addresses

D. URL → HTML

Translates human-friendly names to IPs.

3386. HTTP uses which port by default?

A. 20

B. 20

C. 80

D. 443

Port 80 — standard web traffic.

3385. IP address uniquely identifies:

A. A network

B. A host on the internet

C. A protocol

D. A port

End device in network communication.

3384. TCP stands for:

A. Transmission Control Protocol

B. Transfer Control Process

C. Total Communication Procedure

D. Transit Channel Protocol

Reliable, connection-oriented transport protocol.

3383. OSI model has how many layers?

A. 5

B. 6

C. 7

D. 8

Seven — layers from physical to application.

3382. A full binary tree of height h has:

A. 2^h – 1 nodes

B. 2^(h+1) – 1 nodes

C. h nodes

D. 2h nodes

Maximum nodes in perfectly balanced tree.

3381. Merge sort’s time complexity is:

A. O(n)

B. O(log n)

C. O(n log n)

D. O(n²)

Efficient, stable sort.

3380. Big O of binary search on sorted array:

A. O(n²)

B. O(log n)

C. O(n)

D. O(1)

Logarithmic time — halving search space each step.

3379. Which structure uses key-value pairs?

A. Array

B. Stack

C. Hash map

D. Queue

Hash map — fast lookups.

3378. A stack follows which access order?

A. FIFO

B. LIFO

C. Random

D. Priority

Last In First Out — push/pop operations.

3377. JavaScript primarily adds:

A. Layout

B. Behavior and interactivity

C. Storage

D. Networking

Client-side scripting for dynamic web pages.

3376. CSS is used to

A. Structure content

B. Style content

C. Add behavior

D. Query data

Cascading Style Sheets — visual styling.

3375. HTML is used for:

A. Programming logic

B. Data storage

C. Web page structure

D. Styling web pages

Markup language for webpage layouts.

3374. Which symbol marks the end of a statement in C/C++?

A. .

B. :

C. ;

D. ,

semicolon separates statements.

3373. High-level programming languages are

A. Hardware-specific

B. Machine code

C. More human-readable

D. Slower

Human-readable — e.g. Python, Java.

3372. Floating-point numbers are used to represent:

A. Whole numbers only

B. Text

C. Real numbers with decimals

D. Dates

Real numbers — scientific notation representation.

3371. A nibble is equal to:

A. 2 bits

B. 4 bits

C. 8 bits

D. 16 bits

4 bits — half a byte.

3370. Unicode’s primary purpose is to:

A. Compress data

B. Represent text from all languages

C. Encrypt messages

D. Store images

Universal character encoding for global languages.

3369. In ASCII, what decimal code represents capital ‘A’?

A. 64

B. 65

C. 66

D. 97

65 — standard character encoding.

3368. Binary “1010” represents the decimal number:

A. 8

B. 9

C. 10

D. 12

10 — 1×8 + 0×4 + 1×2 + 0×1

3367. The smallest unit of data in computing is called a:

A. Byte

B. Kilobyte

C. Bit

D. Analog Linear Unit

Arithmetic Logic Unit — performs mathematical and logical operations.

3366. What does GPU stand for?

A. General Processing Unit

B. Graphical Performance Unit

C. Graphics Processing Unit

D. General Purpose Unit

Graphics Processing Unit — handles rendering and visual tasks.

3365. Which of these is non-volatile memory?

A. RAM

B. Cache

C. ROM

D. Registers

ROM — retains data even when power is off.

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