100 Computer Questions and Answers – Interactive MCQ Quiz

In the digital age, understanding computer fundamentals is essential for students, professionals, and tech enthusiasts alike. From hardware components like CPUs and memory modules to software concepts such as operating systems, networking protocols, and programming paradigms, this quiz covers the breadth of computer science basics. Dive into these 100 carefully curated MCQs—each interactive and self-grading—to test and reinforce your knowledge of core concepts, history, and technologies that power our modern world. Ready your clicks and see how many you can master!

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100 Computer Questions and Answers – Interactive MCQ Quiz

1. What does CPU stand for?

  • A. Central Performance Unit
  • B. Central Processing Unit
  • C. Computer Personal Unit
  • D. Central Programming Unit

2. Which of these is volatile memory?

  • A. RAM
  • B. ROM
  • C. Flash
  • D. EEPROM

3. What is the permanent storage in a computer?

  • A. RAM
  • B. Cache
  • C. Registers
  • D. Hard Drive

4. Which device is used to connect a computer to a network?

  • A. Monitor
  • B. Printer
  • C. Network Interface Card
  • D. USB Hub

5. What is the brain of the computer?

  • A. CPU
  • B. GPU
  • C. RAM
  • D. Motherboard

6. Which of these is a programming language?

  • A. HTML
  • B. Python
  • C. HTTP
  • D. XML

7. What does RAM stand for?

  • A. Read Access Memory
  • B. Random Assign Memory
  • C. Random Access Memory
  • D. Read And Modify

8. Which of these is non-volatile memory?

  • A. DRAM
  • B. SRAM
  • C. Cache
  • D. ROM

9. What is the function of an operating system?

  • A. Manufacture CPU
  • B. Manage hardware and software resources
  • C. Store user data
  • D. Provide antivirus protection

10. Which protocol is used to send email?

  • A. FTP
  • B. HTTP
  • C. SMTP
  • D. SNMP

11. What does GPU stand for?

  • A. Graphics Processing Unit
  • B. General Processing Unit
  • C. Graphical Performance Unit
  • D. General Purpose Unit

12. Which language is used for web page structure?

  • A. SQL
  • B. Python
  • C. C++
  • D. HTML

13. What does SSD stand for?

  • A. Solid State Device
  • B. Solid State Drive
  • C. Secure Storage Disk
  • D. System Storage Drive

14. Which of these is an input device?

  • A. Speaker
  • B. Monitor
  • C. Keyboard
  • D. Printer

15. What is BIOS?

  • A. Basic Input/Output System
  • B. Binary Input/Output System
  • C. Basic Interface of Software
  • D. Binary Interface Operating System

16. Which bus carries data between CPU and memory?

  • A. Address bus
  • B. Control bus
  • C. Expansion bus
  • D. Data bus

17. What does URL stand for?

  • A. Uniform Resource Link
  • B. Uniform Resource Locator
  • C. Universal Resource Locator
  • D. Universal Resource Link

18. Which of these is a markup language?

  • A. C++
  • B. Java
  • C. XML
  • D. Python

19. Which layer of OSI model deals with routing?

  • A. Transport
  • B. Session
  • C. Network Interface
  • D. Network

20. What is the size of an IPv4 address?

  • A. 32 bits
  • B. 64 bits
  • C. 128 bits
  • D. 256 bits

21. What does HTTP stand for?

  • A. HyperText Transfer Terminal
  • B. HyperText Transmission Protocol
  • C. HyperText Transfer Protocol
  • D. HyperText Transfer Program

22. Which is not an operating system?

  • A. Windows
  • B. Python
  • C. macOS
  • D. Linux

23. What is the full form of BIOS?

  • A. Basic Interface Operating System
  • B. Binary Input Output System
  • C. Basic Input/Output System
  • D. Binary Input Operating System

24. Which of the following is a file format for images?

  • A. JPEG
  • B. HTML
  • C. TXT
  • D. EXE

25. Which key combination is used to copy in Windows?

  • A. Ctrl + X
  • B. Ctrl + C
  • C. Ctrl + V
  • D. Ctrl + Z

26. What does SQL stand for?

  • A. Simple Query Language
  • B. Structured Query List
  • C. Simple Question Language
  • D. Structured Query Language

27. Which of these is a cloud computing platform?

  • A. Linux Mint
  • B. Ubuntu
  • C. AWS
  • D. Debian

28. What does GUI stand for?

  • A. Graphical User Interface
  • B. General User Interface
  • C. Graphical Unit Interface
  • D. Global User Interface

29. Which port number is used by HTTP?

  • A. 21
  • B. 80
  • C. 443
  • D. 25

30. Which device converts digital signals to analog?

  • A. Router
  • B. Switch
  • C. Hub
  • D. Modem

31. What is the basic unit of information in computing?

  • A. Bit
  • B. Byte
  • C. Nibble
  • D. Word

32. How many bytes are there in a kilobyte (binary)?

  • A. 500
  • B. 1024
  • C. 1000
  • D. 2048

33. Which one is an example of application software?

  • A. BIOS
  • B. Device driver
  • C. Microsoft Word
  • D. Kernel

34. What is the name of Apple's operating system for desktops?

  • A. iOS
  • B. Android
  • C. Windows
  • D. macOS

35. Which is the primary storage area for running programs?

  • A. RAM
  • B. ROM
  • C. HDD
  • D. SSD

36. What is the shortcut for “Paste” in Windows?

  • A. Ctrl + X
  • B. Ctrl + V
  • C. Ctrl + C
  • D. Ctrl + Z

37. Which of these is used to uniquely identify a web resource?

  • A. IP Address
  • B. URL
  • C. URI
  • D. MAC Address

38. What is the maximum length of a FAT32 filename (excluding path)?

  • A. 255 characters
  • B. 128 characters
  • C. 64 characters
  • D. 32 characters

39. Which device stores BIOS?

  • A. RAM
  • B. CPU
  • C. Hard Disk
  • D. ROM Chip

40. Which tool is used to detect and remove malware?

  • A. Defragmenter
  • B. Antivirus
  • C. Disk Cleanup
  • D. Backup Utility

41. Which port number is used by HTTPS?

  • A. 21
  • B. 80
  • C. 443
  • D. 25

42. What does GUI stand for?

  • A. Graphical User Interface
  • B. General Utility Interface
  • C. Graphical Utility Interface
  • D. Global User Interface

43. Which of these is used to browse the internet?

  • A. Notepad
  • B. Paint
  • C. WordPad
  • D. Web Browser

44. Which memory is faster?

  • A. Hard Disk
  • B. Cache
  • C. SSD
  • D. RAM

45. Which of these is not a programming paradigm?

  • A. Object-oriented
  • B. Procedural
  • C. Genetic
  • D. Functional

46. What does API stand for?

  • A. Application Programming Integration
  • B. Automated Program Interface
  • C. Application Protocol Interface
  • D. Application Programming Interface

47. What is the default file system for Windows NT and later?

  • A. NTFS
  • B. FAT32
  • C. ext4
  • D. HFS+

48. Which protocol is used to securely browse the web?

  • A. FTP
  • B. HTTPS
  • C. SMTP
  • D. Telnet

49. Which one is a relational database?

  • A. MongoDB
  • B. Redis
  • C. MySQL
  • D. Neo4j

50. What is the purpose of a compiler?

  • A. Execute code
  • B. Edit code
  • C. Interpret code line by line
  • D. Translate source code to machine code

51. Which topology uses a central hub?

  • A. Ring
  • B. Star
  • C. Mesh
  • D. Bus

52. What does USB stand for?

  • A. Universal Serial Bit
  • B. Unified Serial Bus
  • C. Universal Serial Bus
  • D. Uniform System Bus

53. Which of these is used for version control?

  • A. Git
  • B. Jenkins
  • C. Docker
  • D. Kubernetes

54. What is the default port for FTP?

  • A. 21 (control)
  • B. 20 (data)
  • C. 80
  • D. 443

55. Which is not a type of malware?

  • A. Virus
  • B. Worm
  • C. Trojan
  • D. Registry

56. Which of these is an example of system software?

  • A. MS Office
  • B. Photoshop
  • C. Device Driver
  • D. Firefox

57. What is the hexadecimal representation of decimal 255?

  • A. FF
  • B. FE
  • C. AA
  • D. F0

58. What does DHCP stand for?

  • A. Dynamic Host Configuration Protocol
  • B. Dynamic Host Control Protocol
  • C. Distributed Host Configuration Protocol
  • D. Domain Host Configuration Protocol

59. Which of these is a markup language for documents?

  • A. CSS
  • B. JavaScript
  • C. HTML
  • D. SQL

60. Which algorithm is used for secure data transmission?

  • A. AES
  • B. HTTP
  • C. FTP
  • D. RSA

61. What does LAN stand for?

  • A. Local Area Network
  • B. Large Area Network
  • C. Local Access Node
  • D. Light Area Network

62. Which of these is a Microsoft spreadsheet program?

  • A. Word
  • B. Excel
  • C. PowerPoint
  • D. Access

63. What is the function of ARP?

  • A. Route packets
  • B. Encrypt data
  • C. Map IP to MAC
  • D. Translate domain names

64. Which of these is a Linux distribution?

  • A. Windows 10
  • B. macOS Catalina
  • C. iOS 14
  • D. Ubuntu

65. What is the maximum length of a MAC address?

  • A. 48 bits
  • B. 32 bits
  • C. 64 bits
  • D. 128 bits

66. Which protocol resolves IP addresses to domain names?

  • A. DHCP
  • B. DNS
  • C. FTP
  • D. HTTP

67. In error-checking, what does CRC stand for?

  • A. Cyclic Redundancy Code
  • B. Code Redundancy Check
  • C. Cyclic Redundancy Check
  • D. Computer Redundancy Check

68. Which of these is a kernel type?

  • A. Monolithic
  • B. Microkernel
  • C. Hybrid
  • D. Monolithic

69. Which is the smallest unit of data a computer can process?

  • A. Bit
  • B. Byte
  • C. Word
  • D. Packet

70. Which component stores BIOS settings?

  • A. ROM
  • B. CMOS
  • C. Flash
  • D. EEPROM

71. Which is not an example of cloud storage?

  • A. Google Drive
  • B. Dropbox
  • C. RAM
  • D. OneDrive

72. What does VPN stand for?

  • A. Virtual Private Network
  • B. Variable Public Network
  • C. Virtual Public Network
  • D. Variable Private Network

73. Which is a client-side scripting language?

  • A. PHP
  • B. SQL
  • C. Python
  • D. JavaScript

74. Which is used to style web pages?

  • A. HTML
  • B. CSS
  • C. XML
  • D. JSON

75. Which of these is a NoSQL database?

  • A. MySQL
  • B. PostgreSQL
  • C. MongoDB
  • D. Oracle
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