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Basic Computer GK MCQ’s For Job Exam

Here are 30 multiple-choice questions (MCQs) related to computer general knowledge, along with their answers and explanations:

1. What does CPU stand for?
a. Central Processing Unit
b. Computer Processing Unit
c. Central Printed Unit
d. Central Program Unit

Answer: a. Central Processing Unit

  • Explanation: The CPU (Central Processing Unit) is the primary component of a computer that performs most of the processing tasks.

2. Which programming language is known as the “mother of all languages”?
a. C++
b. Python
c. Assembly
d. COBOL

Answer: c. Assembly

  • Explanation: Assembly language is considered the “mother of all languages” as it directly corresponds to the machine code instructions of a specific computer architecture.

3. What is the purpose of RAM in a computer?
a. Long-term storage
b. Temporary storage
c. Processing input
d. Display output

Answer: b. Temporary storage

  • Explanation: RAM (Random Access Memory) is used for temporary storage of data that the CPU is currently working on or actively using.

4. Which of the following is an example of a high-level programming language?
a. Assembly
b. Machine language
c. Python
d. Binary code

Answer: c. Python

  • Explanation: Python is a high-level programming language that is designed to be easy for humans to read and write.

5. What is the purpose of an operating system?
a. Execute programs
b. Manage hardware and software resources
c. Provide security to data
d. All of the above

Answer: d. All of the above

  • Explanation: An operating system is responsible for managing hardware and software resources, executing programs, and providing security to data.

6. Which file extension is commonly used for a Word document?
a. .docx
b. .txt
c. .pdf
d. .xls

Answer: a. .docx

  • Explanation: Microsoft Word documents typically have the file extension .docx.

7. What does GUI stand for?
a. Graphic User Interface
b. Graphical User Interface
c. General User Interface
d. Generalized User Interface

Answer: b. Graphical User Interface

  • Explanation: GUI stands for Graphical User Interface, which uses graphical elements like icons and windows to interact with users.

8. Which protocol is used for sending emails?
a. HTTP
b. SMTP
c. FTP
d. TCP/IP

Answer: b. SMTP

  • Explanation: Simple Mail Transfer Protocol (SMTP) is the protocol used for sending emails.
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9. What does URL stand for?
a. Uniform Resource Locator
b. Universal Resource Locator
c. Unified Resource Locator
d. Unique Resource Locator

Answer: a. Uniform Resource Locator

  • Explanation: URL stands for Uniform Resource Locator, used to address resources on the internet.

10. What is the function of a router in a network?
a. Connects devices within a network
b. Filters and forwards data between networks
c. Manages network security
d. All of the above

Answer: b. Filters and forwards data between networks

  • Explanation: A router is a networking device that forwards data packets between computer networks.

11. What is the purpose of a firewall in computer security?
a. Monitor internet speed
b. Block unauthorized access
c. Encrypt data
d. Create backups

Answer: b. Block unauthorized access

  • Explanation: Firewalls are designed to block unauthorized access to or from a private network.

12. Which programming language is often used for web development?
a. Java
b. C#
c. JavaScript
d. Swift

Answer: c. JavaScript

  • Explanation: JavaScript is a scripting language commonly used for web development.

13. What is the full form of HTML?
a. Hyper Text Markup Language
b. High-Level Text Markup Language
c. Hyperlink and Text Markup Language
d. Home Tool Markup Language

Answer: a. Hyper Text Markup Language

  • Explanation: HTML stands for Hyper Text Markup Language, used for creating web pages.

14. What is the purpose of an SSD in a computer?
a. Provide temporary storage
b. Enhance graphics performance
c. Store data permanently
d. Manage network connections

Answer: c. Store data permanently

  • Explanation: Solid State Drives (SSDs) are used for permanent storage of data in computers.

15. Which type of software provides an interface for the user to interact with the computer?
a. Operating system
b. Application software
c. System software
d. Utility software

Answer: b. Application software

  • Explanation: Application software provides an interface for users to interact with specific tasks and applications.

16. What does the acronym LAN stand for?
a. Local Area Network
b. Large Area Network
c. Longitudinal Access Network
d. Logical Area Network

Answer: a. Local Area Network

  • Explanation: LAN stands for Local Area Network, a network that is limited to a small geographic area.
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17. Which of the following is a programming paradigm?
a. Object-Oriented
b. Functional
c. Procedural
d. All of the above

Answer: d. All of the above

  • Explanation: Object-Oriented, Functional, and Procedural are all programming paradigms.

18. What is the purpose of the BIOS in a computer?
a. Manage network connections
b. Boot the operating system
c. Run applications
d. Create backups

Answer: b. Boot the operating system

  • Explanation: BIOS (Basic Input/Output System) is responsible for booting the operating system when the computer starts.

19. Which of the following is an example of a spreadsheet software?
a. Microsoft Word
b. Microsoft Excel
c. Microsoft PowerPoint
d. Microsoft Access

Answer: b. Microsoft Excel

  • Explanation: Microsoft Excel is a spreadsheet software used for organizing and analyzing data.

20. What is the purpose of the DNS (Domain Name System)?
a. Encrypt data transmission
b. Convert domain names to IP addresses
c. Manage file storage
d. Monitor network traffic

Answer: b. Convert domain names to IP addresses

  • Explanation: DNS is responsible for translating human-readable domain names into IP addresses.

21. Which type of memory is non-volatile and retains data even when the power is turned off?
a. RAM
b. ROM
c. Cache memory
d. Flash memory

Answer: b. ROM

  • Explanation: Read-

Only Memory (ROM) is non-volatile and retains data even when the power is turned off.

22. What is the purpose of a compiler in programming?
a. Execute code line by line
b. Translate high-level code to machine code
c. Debug programs
d. Manage memory allocation

Answer: b. Translate high-level code to machine code

  • Explanation: A compiler translates high-level programming code into machine code that can be executed by a computer.

23. What is the function of a modem in computer networking?
a. Connects to the internet
b. Modulates and demodulates signals for data transmission
c. Manages network security
d. Creates a local network

Answer: b. Modulates and demodulates signals for data transmission

  • Explanation: Modems modulate and demodulate signals for digital data transmission over analog communication lines.

24. Which programming language is commonly used for artificial intelligence (AI)?
a. Java
b. Python
c. C++
d. Ruby

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Answer: b. Python

  • Explanation: Python is widely used for AI and machine learning applications due to its simplicity and extensive libraries.

25. What is the purpose of a VPN (Virtual Private Network)?
a. Connects devices within a local network
b. Encrypts data for secure communication
c. Manages file storage
d. Provides virus protection

Answer: b. Encrypts data for secure communication

  • Explanation: VPNs provide a secure and encrypted connection for communication over the internet.

26. Which file format is commonly used for audio compression?
a. MP3
b. WAV
c. FLAC
d. AAC

Answer: a. MP3

  • Explanation: MP3 is a widely used file format for audio compression, reducing file size while maintaining quality.

27. What is the purpose of the Ctrl + Z keyboard shortcut?
a. Cut
b. Copy
c. Undo
d. Redo

Answer: c. Undo

  • Explanation: Ctrl + Z is commonly used to undo the last action in various software applications.

28. What is the role of a cache memory in a computer system?
a. Store permanent data
b. Provide additional RAM
c. Temporarily store frequently accessed data
d. Manage network connections

Answer: c. Temporarily store frequently accessed data

  • Explanation: Cache memory is used to store frequently accessed data to reduce access time.

29. Which type of software is designed to detect and remove malicious programs?
a. Firewall
b. Antivirus
c. Encryption software
d. Database management software

Answer: b. Antivirus

  • Explanation: Antivirus software is specifically designed to detect and remove malicious programs, such as viruses and malware.

30. What does the acronym VPN stand for?
a. Virtual Private Network
b. Very Private Network
c. Verified Personal Network
d. Virtual Public Network

Answer: a. Virtual Private Network

  • Explanation: VPN stands for Virtual Private Network, providing a secure and private connection over the internet.**