Basic Computer MCQs for Beginner

1. What is a computer? 

1. A mechanical tool 
2. An electronic device that processes data 
3. A natural object 
4. A type of software 

Answer: B — A computer is an electronic device that accepts input, processes it, and produces output.

2. Who is known as the “Father of Computers”? 

1. Alan Turing 
2. Charles Babbage 
3. Bill Gates 
4. Steve Jobs 

Answer: B — Charles Babbage designed the Analytical Engine, the conceptual basis for the modern computer.

3. Who is considered the “Father of Modern Computer Science”? 

1. A. Charles Babbage 
2. Alan Turing 
3. John von Neumann
4. Ada Lovelace

Answer: B — Alan Turing’s work on computability laid the theoretical foundation for computer science.

4. Which generation of computers used vacuum tubes?

1. First 
2. Second 
3. Third 
4. Fourth 

Answer: A — First-generation computers (1940s–50s) relied on vacuum tubes for circuitry.

5. Which generation of computers introduced microprocessors? 

1. Second 
2. Third 
3. Fourth 
4. Fifth 

Answer: C — Fourth-generation computers (1970s onward) used microprocessors, making computers smaller and cheaper.

6. What does “computer” literally relate to? 

1. Communicate
2. Compute (calculate)
3. Compile 
4. Compress 

Answer: B — The word “computer” originates from “compute,” meaning to calculate.

7. Which company introduced the first widely sold personal computer? 

1. Apple
2. IBM 
3. Microsoft 
4. Commodore 

Answer: B — IBM’s PC, launched in 1981, became the template most personal computers followed.

8. What does CPU stand for?

1. Central Peripheral Unit
2. Central Processing Unit 
3. Computer Personal Unit 
4. Central Program Unit 

Answer: B — The CPU executes instructions and is often called the “brain” of the computer.

9. Which part of the CPU performs arithmetic and logic operations? 

1. Control Unit 
2. ALU 
3. Cache 
4. Registers 

Answer: B — The Arithmetic Logic Unit (ALU) handles calculations and logical comparisons.

10. What is the main circuit board of a computer called?

1. Motherboard
2. Daughterboard 
3. Circuit card 
4. Processor board 

Answer: A — The motherboard connects the CPU, memory, and other components.

11. What does BIOS stand for? 

1. Basic Input Output System 
2. Binary Input Output System 
3. Basic Internal Operating System 
4. Basic Input Output Software 

Answer: A — BIOS is firmware that initializes hardware during the boot process before the OS loads.

12. Which component cools the CPU during operation?

1. Power supply 
2. Heat sink / fan 
3. RAM
4. Hard disk 

Answer: B — A heat sink paired with a fan dissipates heat generated by the CPU.

13. What is the function of the Control Unit (CU)?

1. Store data permanently 
2. Direct the operation of the processor
3. Display output 
4. Connect to the internet 

Answer: B — The Control Unit directs and coordinates the activities of all other computer components.

14. What does RAM stand for?

1. Read Access Memory 
2. Random Access Memory 
3. Read and Manage
4. Rapid Access Module 

Answer: B — RAM is volatile memory used for temporarily holding data the CPU is actively using.

15. What happens to RAM data when the power is turned off?

1. It’s saved automatically 
2. It’s lost
3. It moves to ROM
4. Nothing changes 

Answer: B — RAM is volatile, so its contents are erased when power is cut.

16. What does ROM stand for, and how is it different from RAM?

1. Read Only Memory; non-volatile 
2. Random Only Memory; volatile 
3. Read Only Module; volatile 
4. Rapid Output Memory; non-volatile 

Answer: A — ROM is non-volatile — it retains data even without power, and is typically used to store firmware.

17. Which storage device has no moving mechanical parts?

1. HDD 
2. SSD 
3. Optical drive 
4. Floppy disk 

Answer: B — SSDs (Solid State Drives) use flash memory chips, not spinning platters, making them faster and more durable.

18. What is the standard form factor for most laptop SSDs?

1. 3.5 inch
2. 2.5 inch 
3. 5.25 inch 
4. 1 inch 

Answer: B — 2.5-inch is the common size for laptop and many desktop SSDs.

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

1. Byte 
2. Bit 
3. Nibble 
4. Word 

Answer: B — A bit (binary digit) is either 0 or 1 and is the smallest data unit; 8 bits make a byte.

20. What is cache memory used for?

1. Long-term storage 
2. Speeding up access to frequently used data 
3. Backing up files 
4. Running antivirus scans 

Answer: B — Cache is small, extremely fast memory that stores frequently accessed data close to the CPU.

21. 1 Kilobyte is equal to how many bytes? 

1. 1000 
2. 1024
3. 100 
4. 512 

Answer: B — In binary terms, 1 KB = 1024 bytes (2¹⁰).

22. Which of these is an input device? 

1. Monitor 
2. Printer 
3. Keyboard 
4. Speaker 

Answer: C — A keyboard sends data into the computer; monitors, printers, and speakers are output devices.

23. Which of these is an output device? 

1. Mouse 
2. Scanner 
3. Monitor 
4. Microphone 

Answer: C — A monitor displays processed information to the user.

24. Which device converts a physical document into a digital image? 

1. Printer 
2. Scanner 
3. Projector 
4. Webcam 

Answer: B — A scanner captures a physical page and converts it into a digital file.

25. A device that is both input and output is called?

1. Dual-function device 
2. I/O device 
3. Hybrid processor 
4. Data terminal 

Answer: B — Devices like touchscreens and modems that both send and receive data are called I/O devices.

26. What is the primary function of a mouse?

1. Type text 
2. Point and select on screen 
3. Print documents 
4. Store files 

Answer: B — A mouse is a pointing device used to interact with graphical elements on screen.

27. What is the main function of an operating system? 

1. Create new applications
2. Manage hardware and software resources 
3. Connect to the internet
4. Design graphics 

Answer: B — The OS acts as an intermediary between hardware and the user/applications, managing memory, processes, and devices.

28. Which of these is an open-source operating system? 

1. Windows 
2. macOS
3. Linux
4. iOS 

Answer: C — Linux is open-source, meaning its source code is freely available to view and modify.

29. What is the difference between system software and application software? 

1. There is no difference
2. System software runs the computer itself; application software performs user tasks
3. Application software is always free 
4. System software is only for servers 

Answer: B — System software (like an OS) manages the hardware, while application software (like Word or Chrome) helps users perform specific tasks.

30. What is firmware? 

1. Software stored permanently on hardware
2. A type of virus
3. A web browser 
4. A file compression tool 

Answer: A — Firmware is low-level software embedded directly into hardware devices, like BIOS on a motherboard.

31. What is the difference between hardware and software?

1. They are the same thing 
2. Hardware is physical; software is a set of instructions/programs 
3. Software is physical; hardware is a program
4. Neither is tangible 

Answer: B — Hardware refers to physical components; software refers to the programs and instructions that run on that hardware.

32. Which of these is a widely-used mobile operating system? 

1. Windows Server 
2. Android 
3. Ubuntu
4. DOS 

Answer: B — Android is the operating system used on the majority of smartphones worldwide.

33. What does URL stand for? 

1. Universal Resource Locator 
2. Uniform Resource Locator 
3. Uniform Resource Link
4. Universal Resource Link 

Answer: B — A URL is the address used to locate a resource (like a webpage) on the internet.

34. What does HTTP stand for?

1. HyperText Transfer Protocol 
2. HyperText Transmission Protocol 
3. High Transfer Text Protocol 
4. HyperTransfer Text Protocol 

Answer: A — HTTP is the protocol used to transmit web pages over the internet.

35. What is the purpose of a firewall?

1. Speed up internet connection 
2. Monitor and control network traffic for security
3. Increase Wi-Fi range 
4. Compress files 

Answer: B — A firewall filters incoming and outgoing traffic based on security rules to block unauthorized access.

36. What does DNS stand for, and what does it do?

1. Domain Name System; translates domain names into IP addresses 
2. Digital Network Service; speeds up downloads
3. Data Node System; stores files 
4. Direct Network Server; hosts websites 

Answer: A — DNS converts human-readable domain names (like example.com) into the numeric IP addresses computers use.

37. Which network topology connects all devices to a central hub?

1. Bus
2. Ring
3. Star
4. Mesh

Answer: C — In a star topology, every device connects individually to a central hub or switch.

38. Which of these best describes a peer-to-peer network?

1. One server, many clients 
2. Every computer can act as both client and server
3. Only one client is allowed
4. Devices cannot share files 

Answer: B — In peer-to-peer (P2P) networks, each computer can share resources directly without a dedicated server.

39. What does FTP stand for?

1. File Transfer Protocol
2. File Transmission Process
3. Fast Transfer Protocol
4. File Transport Program 

Answer: A — FTP is used to transfer files between computers over a network.

40. What is an IP address?

1. A password
2. A unique numerical identifier for a device on a network 
3. A file extension
4. A type of virus 

Answer: B — Every device on a network is assigned an IP address so data can be routed to and from it correctly.

41. Which application is used to create spreadsheets? 

1. MS Word
2. MS Excel 
3. MS PowerPoint 
4. MS Access 

Answer: B — MS Excel is designed for organizing data, calculations, and spreadsheets.

42. What does Ctrl + C do?

1. Cuts selected text
2. Copies selected text
3. Pastes text 
4. Closes the document 

Answer: B — Ctrl + C is the standard shortcut for copying selected content to the clipboard.

43. What does Ctrl + Z do?

1. Redo the last action
2. Undo the last action
3. Save the file 
4. Print the document 

Answer: B — Ctrl + Z reverses the most recent action.

44. Which key combination is used to save a document in most applications?

1. Ctrl + P
2. Ctrl + S 
3. Ctrl + N
4. Ctrl + O 

Answer: B — Ctrl + S saves the currently open file.

45. What tool in MS Word finds a similar word for one you’ve used? 

1. Spell Check
2. Thesaurus
3. Grammar Check 
4. Find and Replace 

Answer: B — The Thesaurus tool suggests synonyms for a selected word.

46. Which application is best suited for creating slide presentations?

1. MS Word 
2. MS Excel 
3. MS PowerPoint
4. MS Paint 

Answer: C — MS PowerPoint is built specifically for slide-based presentations.

47. What does Ctrl + P do in most applications?

1. Paste
2. Print 
3. Preview only
4. Password protect 

Answer: B — Ctrl + P opens the print dialog.

48. What is a computer virus?

1. A hardware fault
2. A self-replicating malicious program
3. A type of RAM 
4. A network cable issue 

Answer: B — A virus is malicious software that can replicate itself and spread to other files or systems, often causing damage.

49. What is the safest response to an email attachment from an unknown sender?

1. Open it immediately 
2. Forward it to friends 
3. Avoid opening it and verify the sender first 
4. Reply asking for more attachments 

Answer: C — Unverified attachments are a common malware delivery method; always confirm the sender before opening.

50. What does “phishing” refer to?

1. A method of speeding up downloads
2. Tricking users into revealing sensitive information
3. A file compression technique
4. A type of firewall 

Answer: B — Phishing uses fake emails or websites to trick people into giving up passwords or personal data.

51. What is two-factor authentication (2FA)?

1. Using two different passwords 
2. An extra verification step beyond a password
3. A type of antivirus
4. A backup method 

Answer: B — 2FA adds a second verification step (like a code sent to your phone) to strengthen account security.

52. Why should software be kept updated?

1. It looks better
2. Updates often include vital security patches 
3. It’s required by law
4. Updates always add new fonts 

Answer: B — Software updates frequently patch security vulnerabilities that attackers could otherwise exploit.

53. What is the purpose of antivirus software?

1. Speed up the computer
2. Detect and remove malicious software 
3. Manage file storage 
4. Connect to Wi-Fi 

Answer: B — Antivirus software scans for, blocks, and removes malware such as viruses, worms, and trojans.

54. Which number system does a computer use internally? 

1. Decimal
2. Binary 
3. Octal
4. Hexadecimal 

Answer: B — Computers process data using binary (base-2), represented as 0s and 1s.

55. What does ASCII stand for?

1. American Standard Code for Information Interchange
2. Advanced System Code for International Interchange
3. American System for Coded Information
4. Automated Standard Code for Interchange 

Answer: A — ASCII is a character encoding standard that represents text using numeric codes.

56. How many bits make up one byte?

1. 4
2. 8 
3. 16 
4. 32 

Answer: B — 8 bits together form 1 byte.

57. Which number system uses 16 symbols (0–9 and A–F)?

1. Binary
2. Octal
3. Decimal 
4. Hexadecimal 

Answer: D — Hexadecimal is base-16, commonly used in programming and to represent memory addresses or colors.

58. What is the abbreviation for Graphical User Interface? 

1. GIU 
2. GUI 
3. GUA 
4. GRI 

Answer: B — GUI allows users to interact with a device using visual elements like icons and windows, instead of typed commands.

59. What is defragmentation?

1. Deleting old files
2. Reorganizing fragmented data on a hard disk for efficiency 
3. Compressing a file 
4. Formatting a drive 

Answer: B — Defragmentation rearranges scattered file pieces so they’re stored more contiguously, improving HDD read speed.

60. Which of these file extensions is used for images? 

1. .exe
2. .jpg 
3. .txt
4. .zip 

Answer: B — .jpg (or .jpeg) is a common compressed image file format.

61. What was the first widely-used high-level programming language for business applications?

1. Python
2. Fortran
3. COBOL 
4. Java

Answer: C — COBOL (Common Business-Oriented Language) was developed for business, finance, and administrative use.

62. What is the function of an ALU within the CPU? 

1. Store long-term data
2. Perform arithmetic and logical operations 
3. Manage the display
4. Control the fan speed 

Answer: B — Already covered above in Hardware, but worth remembering — the ALU is a core part of how the CPU actually “computes.”

63. Which of these best describes cloud computing? 

1. Storing data only on a local hard drive
2. Accessing computing resources and storage over the internet
3. A type of virus protection
4. A network cable standard 

Answer: B — Cloud computing delivers storage, processing, and software over the internet instead of relying solely on local hardware.

Conclusion

Understanding the basics of computers — from hardware components like the CPU, RAM, and motherboard to software concepts like operating systems, networking, and cybersecurity — forms the foundation for anyone stepping into the world of technology. Whether you’re a student, a job seeker, or simply someone curious about how computers work, mastering these fundamentals not only builds your confidence but also prepares you for more advanced topics in IT, programming, and data science. Keep revising these basics, practice regularly, and you’ll find that even the most complex tech concepts become easier to grasp over time.

For structured, expert-led training to strengthen these computer fundamentals and build a career in IT, consider enrolling with Gyansetu.