Computer Science MCQS

Computer Science MCQ with detailed explanations for students & freshers preparing for entrance exams, various tests, interviews, competitive exams like GATE exam, interview, competitive examination and entrance exam.

📚 Table of Content

Which key uniquely identifies a record in a table?

A. Foreign Key

B. Primary Key

C. Candidate Key

D. Super Key

Correct answer is: B. Primary Key

Which of the following is a “Cloud Computing” service model?

A. SaaS

B. HTTP

C. HTML

D. LAN

Correct answer is: A. SaaS

Which SQL command is used to delete all records from a table without deleting the table structure?

A. DROP

B. TRUNCATE

C. DELETE

D. REMOVE

Correct answer is: B. TRUNCATE

Which component is known as the “Brain” of the computer?

A. RAM

B. CPU

C. Motherboard

D. BIOS

Correct answer is: B. CPU

Which of the following is a private IP address?

A. 12.0.0.1

B. 192.168.1.1

C. 172.33.0.1

D. 200.1.1.1

Correct answer is: B. 192.168.1.1

The process of converting data into an unreadable format for security is:

A. Decryption

B. Encryption

C. Compression

D. Transmission

Correct answer is: B. Encryption

Which of the following is NOT an Operating System?

A. Linux

B. Oracle

C. DOS

D. Unix

Correct answer is: B. Oracle

The first sector of the hard disk is called:

A. Boot Sector

B. Master Boot Record (MBR)

C. FAT

D. Kernel

Correct answer is: B. Master Boot Record (MBR)

What is the core of the Linux operating system?

A. Shell

B. Kernel

C. Terminal

D. GUI

Correct answer is: B. Kernel

A situation where two processes are waiting for each other to release resources is:

A. Starvation

B. Deadlock

C. Paging

D. Spooling

Correct answer is: B. Deadlock

Which file system is natively used by Windows 10/11?

A. FAT32

B. NTFS

C. HFS

D. EXT4

Correct answer is: B. NTFS

The process of loading the OS into memory is known as:

A. Starting

B. Booting

C. Formatting

D. Processing

Correct answer is: B. Booting

The IPv4 address is composed of how many bits?

A. 16 bits

B. 32 bits

C. 64 bits

D. 128 bits

Correct answer is: B. 32 bits

Which shortcut key is used to open Task Manager in Windows?

A. Ctrl+Alt+Del

B. Ctrl+Shift+Esc

C. Alt+F4

D. Win+R

Correct answer is: B. Ctrl+Shift+Esc

Which layer of the OSI model is responsible for routing?

A. Physical

B. Data Link

C. Network

D. Transport

Correct answer is: C. Network

Multitasking is an extension of:

A. Multiprogramming

B. Time-sharing

C. Batch processing

D. Serial processing

Correct answer is: B. Time-sharing

What is the port number for HTTPS?

A. 80

B. 21

C. 443

D. 25

Correct answer is: C. 443

Virtual memory is typically located on:

A. RAM

B. Hard Disk

C. CPU Cache

D. ROM

Correct answer is: B. Hard Disk

Which protocol is used to assign IP addresses automatically?

A. DNS

B. DHCP

C. HTTP

D. FTP

Correct answer is: B. DHCP

Which command in Linux is used to list files in a directory?

A. dir

B. ls

C. list

D. cd

Correct answer is: B. ls

The device used to connect two different network architectures is:

A. Bridge

B. Hub

C. Gateway

D. Switch

Correct answer is: C. Gateway

Ping command uses which protocol?

A. TCP

B. UDP

C. ICMP

D. SMTP

Correct answer is: C. ICMP

Which topology requires a central controller or hub?

A. Mesh

B. Star

C. Bus

D. Ring

Correct answer is: B. Star

What does ‘MAC’ stand for in MAC address?

A. Memory Access Control

B. Media Access Control

C. Master Access Code

D. Main Access Cell

Correct answer is: B. Media Access Control

Which is an input device?

A. Monitor

B. Printer

C. Keyboard

D. Speaker

Correct answer is: C. Keyboard

Keyboard is used to input data.