Computer Systems & Organisation MCQs | 50 Practice Questions with Answers | CBSE Class 11 Computer Science
Class 11 · Computer Science
Computer Systems & Organisation MCQs (50 Questions)
Practice these multiple-choice questions to strengthen your understanding of Computer Systems & Organisation. Click Show Answer to reveal the correct answer and explanation.
Q1. What is a Computer System?
A. Only hardware components.
B. Only software programs.
C. A combination of hardware and software that works together to process data.
D. A network connection.
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Answer: C.
Explanation: A computer system consists of hardware and software working together to accept input, process data, store information, and produce output.
Q2. Which of the following is an example of hardware?
A. MS Word
B. Windows 11
C. Keyboard
D. Python
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Answer: C. Keyboard
Explanation: Hardware refers to the physical components of a computer system that can be seen and touched.
Q3. Which of the following is an example of software?
A. Monitor
B. Printer
C. Operating System
D. Mouse
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Answer: C. Operating System
Explanation: Software is a collection of programs and instructions that tell the computer how to perform tasks.
Q4. Which statement correctly distinguishes hardware from software?
A. Hardware can be touched; software cannot.
B. Software can be touched; hardware cannot.
C. Both hardware and software are physical devices.
D. Neither hardware nor software is required for a computer system.
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Answer: A.
Explanation: Hardware consists of physical components, whereas software consists of programs and instructions.
Q5. Which of the following is NOT hardware?
A. Scanner
B. RAM
C. Linux
D. Hard Disk
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Answer: C. Linux
Explanation: Linux is an operating system, which is system software.
Q6. Which of the following is NOT software?
A. MS Excel
B. Ubuntu
C. Python Interpreter
D. Mouse
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Answer: D. Mouse
Explanation: A mouse is a physical input device and therefore hardware.
Q7. Which of the following components is essential for the working of a computer system?
A. Hardware only
B. Software only
C. Both hardware and software
D. Internet connection only
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Answer: C.
Explanation: A computer requires both hardware and software to function properly.
Q8. Which of the following is system software?
A. Paint
B. Windows 11
C. VLC Media Player
D. Adobe Photoshop
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Answer: B. Windows 11
Explanation: Windows is an operating system, which is system software.
Q9. Which of the following is application software?
A. Linux
B. Compiler
C. MS Word
D. Device Driver
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Answer: C. MS Word
Explanation: MS Word is application software designed to perform specific user tasks.
Q10. Which statement about computer systems is correct?
A. Hardware performs physical operations.
B. Software provides instructions to hardware.
C. Both hardware and software are necessary for a computer to function.
D. All of these.
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Answer: D. All of these.
Explanation: Hardware and software work together to perform all computing operations.
Computer Systems & Organisation MCQs (Part 2: Input Devices, Output Devices, CPU & Memory)
Q11. Which of the following is an input device?
A. Monitor
B. Printer
C. Keyboard
D. Speaker
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Answer: C. Keyboard
Explanation: A keyboard is an input device used to enter data and instructions into a computer.
Q12. Which of the following is an output device?
A. Scanner
B. Mouse
C. Microphone
D. Printer
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Answer: D. Printer
Explanation: A printer produces a hard copy of the output generated by the computer.
Q13. Which device is used to capture printed documents and convert them into digital form?
A. Monitor
B. Scanner
C. Speaker
D. Plotter
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Answer: B. Scanner
Explanation: A scanner is an input device that converts printed text or images into digital format.
Q14. Which of the following is considered the brain of the computer?
A. RAM
B. Hard Disk
C. CPU
D. Monitor
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Answer: C. CPU
Explanation: The Central Processing Unit (CPU) performs processing and controls all operations of the computer.
Q15. Which unit of the CPU performs arithmetic and logical operations?
A. Control Unit (CU)
B. Arithmetic Logic Unit (ALU)
C. Memory Unit
D. Cache Unit
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Answer: B. Arithmetic Logic Unit (ALU)
Explanation: The ALU performs arithmetic calculations and logical comparisons.
Q16. Which unit of the CPU controls and coordinates all operations of the computer?
A. RAM
B. ALU
C. Control Unit (CU)
D. Hard Disk
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Answer: C. Control Unit (CU)
Explanation: The Control Unit manages the execution of instructions and coordinates communication between different components.
Q17. Which type of memory stores data and instructions currently being processed by the CPU?
A. Hard Disk
B. RAM
C. DVD
D. Pen Drive
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Answer: B. RAM
Explanation: RAM is the primary memory that temporarily stores data and instructions currently in use.
Q18. Which of the following is an example of primary memory?
A. SSD
B. Hard Disk
C. RAM
D. Blu-ray Disc
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Answer: C. RAM
Explanation: RAM is a type of primary memory directly accessed by the CPU.
Q19. Which memory is directly accessed by the CPU for fast processing?
A. Primary Memory
B. Optical Disk
C. USB Flash Drive
D. Magnetic Tape
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Answer: A. Primary Memory
Explanation: The CPU directly accesses primary memory to execute programs efficiently.
Q20. Which statement about the CPU and memory is correct?
A. The CPU consists of the ALU and Control Unit.
B. RAM stores data temporarily.
C. Input devices send data to the computer, while output devices display results.
D. All of these.
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Answer: D. All of these.
Explanation: The CPU contains the ALU and CU, RAM provides temporary storage, and input/output devices enable communication between the user and the computer.
Computer Systems & Organisation MCQs (Part 3: Memory & Units of Memory)
Q21. Which type of memory is the fastest among the following?
A. Hard Disk
B. Cache Memory
C. DVD
D. Pen Drive
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Answer: B. Cache Memory
Explanation: Cache memory is a very high-speed memory located close to the CPU. It stores frequently used data and instructions to improve processing speed.
Q22. Why is Cache Memory used?
A. To permanently store files.
B. To speed up CPU operations by storing frequently used data.
C. To connect to the Internet.
D. To print documents.
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Answer: B.
Explanation: Cache memory reduces the time required by the CPU to access frequently used information.
Q23. Which of the following is an example of secondary memory?
A. Cache Memory
B. RAM
C. Hard Disk
D. CPU Register
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Answer: C. Hard Disk
Explanation: Secondary memory provides permanent storage for programs and data.
Q24. Which type of memory is non-volatile?
A. RAM
B. Cache Memory
C. Hard Disk
D. CPU Registers
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Answer: C. Hard Disk
Explanation: Secondary storage devices such as hard disks retain data even after the power is switched off.
Q25. Which is the smallest unit of computer memory?
A. Byte
B. Bit
C. Kilobyte
D. Nibble
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Answer: B. Bit
Explanation: A bit (Binary Digit) is the smallest unit of data and can have a value of either 0 or 1.
Q26. One byte is equal to:
A. 2 bits
B. 4 bits
C. 8 bits
D. 16 bits
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Answer: C. 8 bits
Explanation: A byte consists of 8 bits and is commonly used to represent one character.
Q27. How many kilobytes (KB) are there in one megabyte (MB)?
A. 1000 KB
B. 1024 KB
C. 512 KB
D. 2048 KB
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Answer: B. 1024 KB
Explanation: In computer memory measurements, 1 MB = 1024 KB.
Q28. Which of the following represents the correct order of memory units from smallest to largest?
A. Byte → Bit → KB → MB → GB
B. Bit → Byte → KB → MB → GB
C. KB → Byte → Bit → MB → GB
D. Bit → KB → Byte → MB → GB
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Answer: B.
Explanation: The correct ascending order is Bit → Byte → Kilobyte → Megabyte → Gigabyte → Terabyte → Petabyte.
Q29. Which unit is larger than a Terabyte (TB)?
A. Gigabyte (GB)
B. Megabyte (MB)
C. Petabyte (PB)
D. Kilobyte (KB)
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Answer: C. Petabyte (PB)
Explanation: The sequence is KB → MB → GB → TB → PB.
Q30. Which statement about memory is correct?
A. Cache memory is faster than RAM.
B. Secondary memory stores data permanently.
C. One byte contains eight bits.
D. All of these.
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Answer: D. All of these.
Explanation: Cache memory improves CPU performance, secondary memory provides permanent storage, and one byte is equal to eight bits.
Computer Systems & Organisation MCQs (Part 4: System Software)
Q31. What is System Software?
A. Software designed to perform specific user tasks.
B. Software that manages computer hardware and provides a platform for application software.
C. Software used only for games.
D. Software used only for programming.
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Answer: B.
Explanation: System software controls and manages computer hardware and enables application software to function properly.
Q32. Which of the following is an example of System Software?
A. MS Word
B. Adobe Photoshop
C. Windows 11
D. VLC Media Player
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Answer: C. Windows 11
Explanation: Windows is an operating system, which is a type of system software.
Q33. Which of the following is the most important system software?
A. Operating System
B. Web Browser
C. Spreadsheet Software
D. Presentation Software
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Answer: A. Operating System
Explanation: The operating system manages all hardware and software resources of the computer.
Q34. Which of the following is a primary function of an Operating System?
A. Managing memory and files.
B. Controlling input and output devices.
C. Managing application programs.
D. All of these.
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Answer: D. All of these.
Explanation: An operating system manages memory, files, hardware devices, and application software.
Q35. Which of the following is an example of an operating system?
A. Linux
B. Ubuntu
C. Windows
D. All of these
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Answer: D. All of these.
Explanation: Linux, Ubuntu, and Windows are all operating systems.
Q36. What is the purpose of System Utilities?
A. To maintain, protect, and optimize the computer system.
B. To create presentations.
C. To browse websites.
D. To develop games.
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Answer: A.
Explanation: System utilities help maintain system performance through tasks such as disk cleanup, backup, antivirus scanning, and file management.
Q37. Which of the following is an example of a System Utility?
A. Antivirus Software
B. Disk Cleanup Tool
C. Backup Utility
D. All of these
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Answer: D. All of these.
Explanation: Antivirus programs, disk cleanup tools, and backup utilities are common examples of system utilities.
Q38. What is the primary function of a Device Driver?
A. To create documents.
B. To allow the operating system to communicate with hardware devices.
C. To increase Internet speed.
D. To store user files.
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Answer: B.
Explanation: Device drivers act as an interface between the operating system and hardware devices such as printers, scanners, and keyboards.
Q39. Which of the following devices typically requires a device driver?
A. Printer
B. Scanner
C. Graphics Card
D. All of these
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Answer: D. All of these.
Explanation: Most hardware devices require appropriate drivers to function correctly with the operating system.
Q40. Which statement about system software is correct?
A. The operating system manages computer resources.
B. System utilities maintain and optimize the system.
C. Device drivers enable communication between hardware and the operating system.
D. All of these.
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Answer: D. All of these.
Explanation: System software includes operating systems, system utilities, and device drivers, all of which are essential for efficient computer operation.
Computer Systems & Organisation MCQs (Part 5: Programming Tools, Language Translators & Application Software)
Q41. What is the purpose of a Language Translator?
A. To convert high-level or assembly language programs into machine language.
B. To increase Internet speed.
C. To repair computer hardware.
D. To create presentations.
Show Answer
Answer: A.
Explanation: Language translators convert source code into machine code so that the computer can execute it.
Q42. Which language translator converts Assembly Language into machine language?
A. Compiler
B. Interpreter
C. Assembler
D. Loader
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Answer: C. Assembler
Explanation: An assembler translates assembly language instructions into machine language.
Q43. Which language translator converts an entire high-level language program into machine code at once?
A. Interpreter
B. Compiler
C. Assembler
D. Debugger
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Answer: B. Compiler
Explanation: A compiler translates the complete source program into machine language before execution.
Q44. Which language translator executes a program line by line?
A. Compiler
B. Assembler
C. Interpreter
D. Linker
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Answer: C. Interpreter
Explanation: An interpreter translates and executes one statement at a time.
Q45. Which statement correctly distinguishes a compiler from an interpreter?
A. A compiler translates the entire program, while an interpreter translates one statement at a time.
B. A compiler executes programs line by line.
C. An interpreter translates assembly language.
D. Both work in exactly the same way.
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Answer: A.
Explanation: A compiler processes the complete program before execution, whereas an interpreter translates and executes each statement sequentially.
Q46. Which of the following is an example of Application Software?
A. MS PowerPoint
B. Adobe Photoshop
C. Google Chrome
D. All of these
Show Answer
Answer: D. All of these.
Explanation: Application software is designed to help users perform specific tasks such as creating documents, browsing the web, editing images, or making presentations.
Q47. Which type of software is developed to perform a specific task for the user?
A. System Software
B. Firmware
C. Application Software
D. Device Driver
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Answer: C. Application Software
Explanation: Application software is designed to perform user-oriented tasks such as word processing, spreadsheets, presentations, and web browsing.
Q48. Which of the following is correctly matched?
A. Assembler — Assembly Language
B. Compiler — High-Level Language
C. Interpreter — High-Level Language
D. All of these
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Answer: D. All of these.
Explanation: An assembler translates assembly language, while both compilers and interpreters translate high-level language programs.
Q49. Which software category does Python IDLE belong to?
A. Operating System
B. Programming Tool
C. Device Driver
D. Utility Software
Show Answer
Answer: B. Programming Tool
Explanation: Python IDLE is a programming environment used to write, edit, and execute Python programs.
Q50. Which statement about computer software is correct?
A. System software manages computer resources.
B. Application software performs user-specific tasks.
C. Assemblers, compilers, and interpreters are language translators.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: System software manages hardware, application software helps users perform tasks, and language translators convert programs into machine language.
Answer Key
| Q.No. | Answer | Q.No. | Answer | Q.No. | Answer |
|---|---|---|---|---|---|
| 1 | C | 11 | C | 21 | B |
| 2 | C | 12 | D | 22 | B |
| 3 | C | 13 | B | 23 | C |
| 4 | A | 14 | C | 24 | C |
| 5 | C | 15 | B | 25 | B |
| 6 | D | 16 | C | 26 | C |
| 7 | C | 17 | B | 27 | B |
| 8 | B | 18 | C | 28 | B |
| 9 | C | 19 | A | 29 | C |
| 10 | D | 20 | D | 30 | D |
| 31 | B | 41 | A | ||
| 32 | C | 42 | C | ||
| 33 | A | 43 | B | ||
| 34 | D | 44 | C | ||
| 35 | D | 45 | A | ||
| 36 | A | 46 | D | ||
| 37 | D | 47 | C | ||
| 38 | B | 48 | D | ||
| 39 | D | 49 | B | ||
| 40 | D | 50 | D |
Practice Tips
- Understand the basic components of a computer system:
- Hardware
- Software
- Input Devices
- Output Devices
- CPU (ALU + Control Unit)
- Primary, Cache, and Secondary Memory
- Remember the memory hierarchy:
- Cache Memory – Fastest
- Primary Memory (RAM) – Temporary storage
- Secondary Memory – Permanent storage
- Memorize memory units in ascending order:
- Bit → Byte → KB → MB → GB → TB → PB
- 1 Byte = 8 Bits
- 1 KB = 1024 Bytes
- 1 MB = 1024 KB
- 1 GB = 1024 MB
- Differentiate between software categories:
- System Software – Operating System, Utilities, Device Drivers
- Application Software – MS Word, Chrome, Photoshop, VLC
- Programming Tools – Python IDLE, IDEs, Editors
- Remember the language translators:
- Assembler – Assembly Language → Machine Language
- Compiler – Translates the entire program at once
- Interpreter – Translates and executes one statement at a time
- Practice competency-based and application-oriented questions, as CBSE frequently asks conceptual MCQs on hardware, memory, operating systems, and language translators.