Computer Science most important MCQs | 50 Top Computer Science MCQs

Click on the option according to your mind. If it turns green, your answer is correct. If it turns red, your answer is wrong, and the green option is the correct one—remember it carefully.

1. What is the brain of a computer?

A) RAM B) CPU C) Hard Disk D) Monitor

2. Which of the following is an input device?

A) Keyboard B) Monitor C) Printer D) Speaker

3. What does RAM stand for?

A) Read Access Memory B) Random Access Memory C) Read And Modify D) None of the above

4. Which one is a programming language?

A) HTML B) CSS C) Python D) XML

5. What is the full form of CPU?

A) Central Processing Unit B) Central Program Unit C) Control Processing Unit D) Central Peripheral Unit

6. What is the full form of HTTP?

A) Hyper Text Transfer Package B) Hyper Text Transfer Protocol C) Hyperlink Transfer Protocol D) Hyper Text Transmission Protocol

7. What type of storage is a Hard Disk?

A) Primary Storage B) Cache Storage C) Secondary Storage D) Virtual Memory

8. Which key is used to refresh a web page?

A) Ctrl + R B) Shift + R C) Alt + R D) F5

9. Which of the following is NOT an operating system?

A) Windows B) Linux C) Google Chrome D) MacOS

10. Which programming language is used to create web pages?

A) HTML B) Java C) C++ D) Python

11. What does CPU stand for?

A) Central Process Unit B) Central Processing Unit C) Central Program Unit D) Central Peripheral Unit

12. What is the shortcut key to copy a selected text?

A) Ctrl + X B) Ctrl + Z C) Ctrl + P D) Ctrl + C

13. Which of the following is a web browser?

A) Windows B) Mozilla Firefox C) Microsoft Word D) Photoshop

14. What is the function of RAM in a computer?

A) Stores permanent data B) Controls all computer processes C) Temporary memory for processing D) Stores software programs

15. Which of the following is an input device?

A) Keyboard B) Monitor C) Printer D) Speaker

16. What is the full form of HTTP?

A) Hyper Text Transfer Page B) High Text Transmission Protocol C) Hyper Text Transfer Protocol D) High Transmission Text Process

17. Which of the following is an example of an operating system?

A) Microsoft Office B) Windows 10 C) Google Chrome D) Adobe Photoshop

18. Which device is used to convert digital signals into analog for transmission over telephone lines?

A) Modem B) Router C) Switch D) Hub

19. What is the smallest unit of data in a computer?

A) Nibble B) Byte C) Kilobyte D) Bit

20. Which software is used to browse the internet?

A) MS Word B) Adobe Reader C) Google Chrome D) VLC Media Player

21. What does CPU stand for?

A) Central Processing Utility B) Central Processing Unit C) Computer Personal Unit D) Central Processor Utility

22. What is the main function of RAM?

A) Store permanent files B) Control computer speed C) Store software updates D) Temporary storage for processing

23. Which of the following is an example of an input device?

A) Printer B) Monitor C) Keyboard D) Speaker

24. Which programming language is known as the "mother of all languages"?

A) C B) Java C) Python D) JavaScript

25. Which of the following is NOT an example of an operating system?

A) Windows B) macOS C) Linux D) Microsoft Office

26. Which of the following is the brain of the computer?

A) RAM B) CPU C) Hard Drive D) Motherboard

27. What does HTML stand for?

A) Hyperlink Markup Language B) High Text Markup Language C) HyperText Markup Language D) Home Tool Markup Language

28. What is the function of an operating system?

A) Manages hardware and software B) Provides an interface for users C) Controls system resources D) All of the above

29. Which key combination is used to copy text in a Windows computer?

A) Ctrl + C B) Ctrl + X C) Ctrl + V D) Ctrl + Z

30. What is the default file extension of a Microsoft Excel workbook?

A) .docx B) .xlsx C) .pptx D) .txt

31. Which device is used as the standard input device?

A) Printer B) Monitor C) Keyboard D) Speaker

32. What is the full form of RAM?

A) Read Access Memory B) Random Access Memory C) Run Access Memory D) Readable Access Memory

33. Which of the following is NOT an operating system?

A) Windows B) Linux C) macOS D) Microsoft Office

34. What is the shortcut key for "Paste" in Windows?

A) Ctrl + C B) Ctrl + X C) Ctrl + V D) Ctrl + P

35. What is the function of a Firewall in a computer?

A) Protects against unauthorized access B) Increases internet speed C) Repairs hard disk errors D) Removes computer viruses

36. Which of the following is a programming language?

A) HTML B) CSS C) Python D) XML

37. What does "CPU" stand for?

A) Central Processing Unit B) Central Processing Unit C) Central Printed Unit D) Computer Processing Unit

38. What type of software is MS Word?

A) Operating System B) Utility Software C) System Software D) Application Software

39. What does HTTP stand for?

A) HyperText Transfer Protocol B) High Text Transfer Protocol C) Hyperlink Transfer Protocol D) High Transfer Text Protocol

40. Which key combination is used to "Undo" in Windows?

A) Ctrl + Y B) Ctrl + Z B) Ctrl + X B) Ctrl + V

41. What is the main function of an Operating System?

A) Manage Computer Hardware B) Control Software and Hardware C) Process Data D) Create Programs

42. What does BIOS stand for?

A) Basic Integrated Operating System B) Basic Input Operational System C) Basic Input Output System D) Binary Input Output System

43. What is an IP Address used for?

A) Identifying a device on a network B) Encrypting network traffic C) Storing files D) Controlling a printer

44. What is the shortcut key for "Paste" in Windows?

A) Ctrl + X B) Ctrl + V B) Ctrl + C B) Ctrl + P

46. What does HTML stand for?

A) Hyper Transfer Markup Language B) High Text Machine Learning C) Hyper Text Markup Language D) Home Tool Markup Language

47. Which of the following is an example of a web browser?

A) Windows B) Google Chrome C) Microsoft Word D) Adobe Photoshop

48. What is the full form of HTTP?

A) Hyper Tool Text Processor B) Hyper Transfer Text Protocol C) High Text Transfer Process D) Hyper Text Transfer Protocol

49. Which key is used to refresh a webpage in Windows?

A) Ctrl + R B) Ctrl + F5 C) F5 D) Shift + F5

50. What is the smallest unit of data in a computer?

A) Bit B) Byte C) Kilobyte D) Megabyte

51. What is the purpose of a firewall in a computer system?

A) To store files B) To protect a network from unauthorized access C) To increase internet speed D) To fix computer errors