600 Most Important computer mcqs with answers PDF 2026

600+ Most Important & Most Repeated computer mcqs with answers pdf . Basic Computer MCQs for competitive exams. Important Computer Fundamentals MCQs for interviews. Most repeated computer MCQs for CSS, NTS, OTS, FPSC, PPSC, UPSC, GATE, UGC NET, SSC, bank exams, and all government job tests. This comprehensive collection covers Programming, Computer Hardware, Software & Operating Systems, Networking & Internet, MS Office, Computer Security, and General Knowledge. Most Repeated Basics MCQs of Computer PDF — download free.

📌 Note: The bold green option ✅ is the correct answer for the given MCQs.

 

Programming & Logic

1. Choose the correct statement:

a) Use of goto enhances the logical clarity of a code

b) Use of goto makes the debugging task easier

c) Use goto when you want to jump out of a nested loop ✅

d) Never use goto statement

2. Choose the correct statements:

a) Casting refer to implicit type conversion

b) Coercion refer to implicit type conversion

c) Casting refer to explicit type conversion

d) b and c ✅

3. If integer needs two bytes of storage, then maximum value of unsigned integer is:

a) 2¹⁶ – 1 ✅    b) 2¹⁵ – 1    c) 2¹⁶    d) 2¹⁵

4. If y is an integer type then the expression 3+(y-8)/9 and (y-8)/9*3:

a) Must yield the same value

b) May or may not yield the same value

c) May yield different value ✅

d) None of the above

5. C is a:

a) High level language

b) Low level language

c) High level language with some Low level features ✅

d) Low level language with some High level features

6. Let a and b be two non-negative integers. Which of the following calls finds the positive difference of a and b?

a) Find(a,b) + find(b,a)

b) a + find(a,b)

c) find(a, find(a,b)) ✅

d) b + find(a,b)

7. Consider the function: find(int x, int y) { return ((x<y) ? 0 : (x-y)); } — The call find(a, find(a,b)) can be used to find the:

a) maximum of a,b

b) sum of a,b

c) positive difference of a,b

d) minimum of a,b ✅

Computer Fundamentals & Hardware

8. The brain of the computer is called:

a) RAM    b) CPU (Central Processing Unit) ✅    c) Hard Disk    d) Monitor

9. CPU stands for:

a) Computer Personal Unit    b) Central Process Unit    c) Central Processing Unit ✅    d) Central Processor Unifier

10. Which of the following is NOT an input device?

a) Keyboard    b) Mouse    c) Printer ✅    d) Scanner

11. RAM stands for:

a) Read Access Memory    b) Random Access Memory ✅    c) Random Available Memory    d) Read Available Memory

12. Which memory is volatile (data lost when power is off)?

a) RAM ✅    b) ROM    c) Hard Disk    d) CD-ROM

13. ROM stands for:

a) Random Only Memory    b) Read Only Memory ✅    c) Read On Memory    d) Run Only Memory

14. The smallest unit of data in a computer is:

a) Byte    b) Bit ✅    c) Kilobyte    d) Nibble

15. 1 Byte is equal to:

a) 4 bits    b) 8 bits ✅    c) 16 bits    d) 32 bits

16. 1 Kilobyte (KB) is equal to:

a) 1000 bytes    b) 1024 bytes ✅    c) 512 bytes    d) 2048 bytes

17. Which component connects all parts of the computer together?

a) CPU    b) RAM    c) Motherboard ✅    d) Power Supply

18. ALU stands for:

a) Allowed Logic Unit    b) Arithmetic Logic Unit ✅    c) Arithmetic Local Unit    d) Allowed Local Unit

19. Which of the following is secondary storage?

a) RAM    b) Cache    c) Hard Disk Drive ✅    d) Registers

20. SSD stands for:

a) System Storage Device    b) Super Speed Disk    c) Solid State Drive ✅    d) Solid System Drive

21. Which is faster — SSD or HDD?

a) HDD    b) SSD ✅    c) Both same    d) Depends on brand

22. First generation computers used:

a) Vacuum Tubes ✅    b) Transistors    c) Integrated Circuits    d) Microprocessors

23. Second generation computers used:

a) Vacuum Tubes    b) Transistors ✅    c) ICs    d) Microprocessors

24. Microprocessor was introduced in which generation?

a) 2nd    b) 3rd    c) 4th Generation ✅    d) 5th

Software & Operating System

25. An operating system is a type of:

a) Application software    b) System software ✅    c) Utility software    d) Firmware

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

a) Windows    b) Linux    c) Microsoft Office ✅    d) macOS

27. MS Word is an example of:

a) System software    b) Application software ✅    c) Operating system    d) Programming language

28. Which software translates high-level language into machine code all at once?

a) Interpreter    b) Compiler ✅    c) Assembler    d) Linker

29. Which software translates code line by line?

a) Interpreter ✅    b) Compiler    c) Assembler    d) Debugger

30. BIOS stands for:

a) Binary Input Output System    b) Basic Input Output System ✅    c) Basic Internet Operating System    d) Binary Internal Operating System

31. Linux is an example of:

a) Closed-source OS    b) Open-source OS ✅    c) Application software    d) Firmware

32. Which shortcut key is used to copy text?

a) Ctrl + V    b) Ctrl + X    c) Ctrl + C ✅    d) Ctrl + Z

33. Ctrl + Z is used for:

a) Copy    b) Paste    c) Cut    d) Undo ✅

34. The extension of Microsoft Word document is:

a) .xls    b) .docx ✅    c) .pptx    d) .pdf

35. The extension of Microsoft Excel file is:

a) .docx    b) .xlsx ✅    c) .pptx    d) .accdb

36. Microsoft PowerPoint is used for:

a) Word processing    b) Spreadsheets    c) Creating presentations ✅    d) Database management

37. Which function in Excel adds a range of cells?

a) ADD()    b) SUM() ✅    c) TOTAL()    d) COUNT()

Networking & Internet

38. LAN stands for:

a) Large Area Network    b) Local Area Network ✅    c) Long Area Network    d) Logical Area Network

39. WAN stands for:

a) Wireless Area Network    b) Wired Area Network    c) Wide Area Network ✅    d) Web Area Network

40. The Internet is an example of:

a) LAN    b) MAN    c) WAN ✅    d) PAN

41. IP stands for:

a) Internal Protocol    b) Internet Protocol ✅    c) Intranet Protocol    d) Internet Process

42. HTTP stands for:

a) HyperText Transfer Protocol ✅    b) High Text Transfer Protocol    c) HyperText Transmission Protocol    d) High Transfer Text Protocol

43. Which protocol is used to send emails?

a) FTP    b) HTTP    c) SMTP ✅    d) TCP

44. DNS converts:

a) IP to MAC    b) Domain name to IP address ✅    c) IP to domain name    d) MAC to IP

45. Which device routes data between different networks?

a) Hub    b) Switch    c) Router ✅    d) Repeater

46. How many layers in the OSI model?

a) 4    b) 5    c) 6    d) 7 ✅

47. WWW stands for:

a) Wide World Web    b) Web World Wide    c) World Wide Web ✅    d) World Web Wide

Security & General Knowledge

48. Software designed to damage a computer is called:

a) Hardware    b) Firmware    c) Malware ✅    d) Shareware

49. Which is NOT a type of malware?

a) Virus    b) Trojan    c) Worm    d) Firewall ✅

50. A firewall is used to:

a) Speed up internet    b) Protect network from unauthorized access ✅    c) Store backup    d) Increase RAM

51. Binary equivalent of decimal 10 is:

a) 1100    b) 1010 ✅    c) 1001    d) 1110

52. 1 GB is equal to:

a) 1000 MB    b) 1024 MB ✅    c) 512 MB    d) 2048 MB

53. The fastest memory in a computer is:

a) RAM    b) Hard Disk    c) Cache Memory ✅    d) ROM

54. USB stands for:

a) United Serial Bus    b) Universal Serial Bus ✅    c) Universal System Bus    d) Unified Serial Bus

55. Which shortcut key is used to print a document?

a) Ctrl + S    b) Ctrl + P ✅    c) Ctrl + D    d) Ctrl + F

56. Which is both an input AND output device?

a) Keyboard    b) Printer    c) Touchscreen ✅    d) Scanner

57. Ctrl + S is used for:

a) Select all    b) Save ✅    c) Search    d) Shutdown

📚 Practice More Topic-Wise Computer MCQs

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