Computer Science
Multiple Choice
Questions
(MCQs) – Sets 42
with Detailed Explanations
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SET 42 – Computer Science MCQs
✅ No repetition from Sets 1–41
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is hardware?
A. Computer programs
B. Data files
C. Physical parts of a computer
D. Internet service
✅ Correct Answer: C
Explanation:
Hardware refers to the physical components of a computer system that can be seen and touched. Examples include the keyboard, mouse, monitor, CPU, and printer. Hardware works together with software to perform tasks. Without hardware, software cannot function.
2. What is input device?
A. Device that shows result
B. Device that stores data
C. Device used to enter data into computer
D. Network device
✅ Correct Answer: C
Explanation:
An input device is used to send data and instructions to the computer. Examples include keyboard, mouse, scanner, and microphone. Input devices allow users to interact with the computer and control its operations effectively.
3. What is output device?
A. Device that accepts data
B. Device that processes data
C. Device that displays results
D. Storage device
✅ Correct Answer: C
Explanation:
An output device displays or produces the result of processed data. Examples include monitor, printer, and speakers. Output devices help users understand the results of computer processing in visual, printed, or audio form.
4. What is CPU?
A. Storage device
B. Input unit
C. Central Processing Unit
D. Output unit
✅ Correct Answer: C
Explanation:
CPU stands for Central Processing Unit. It is the brain of the computer that performs calculations, logical operations, and controls all activities. The CPU processes instructions and manages communication between hardware components.
5. What is ALU?
A. Storage unit
B. Control unit
C. Arithmetic Logic Unit
D. Memory unit
✅ Correct Answer: C
Explanation:
ALU stands for Arithmetic Logic Unit. It is a part of the CPU responsible for performing arithmetic operations like addition and subtraction, and logical operations like comparison. The ALU plays a crucial role in data processing.
6. What is control unit?
A. Stores data
B. Performs calculations
C. Directs operations of the computer
D. Displays output
✅ Correct Answer: C
Explanation:
The control unit manages and coordinates all operations of the computer. It directs the flow of data between CPU, memory, and input/output devices. The control unit ensures that instructions are executed in the correct order.
7. What is primary memory?
A. External storage
B. Backup device
C. Main memory directly accessed by CPU
D. Network storage
✅ Correct Answer: C
Explanation:
Primary memory is the main memory of the computer that is directly accessed by the CPU. It stores data and instructions currently in use. Examples include RAM and ROM. Primary memory is fast but has limited capacity.
8. What is secondary storage?
A. Temporary memory
B. Cache memory
C. Permanent storage for data
D. CPU register
✅ Correct Answer: C
Explanation:
Secondary storage is used to store data permanently. It is not directly accessed by the CPU. Examples include hard disks, pen drives, and CDs. Secondary storage has large capacity and keeps data safe even when power is off.
9. What is cache memory?
A. Slow memory
B. External memory
C. High-speed memory between CPU and RAM
D. Backup memory
✅ Correct Answer: C
Explanation:
Cache memory is a small, high-speed memory located between the CPU and RAM. It stores frequently used data and instructions to speed up processing. Cache improves overall system performance by reducing access time.
10. What is motherboard?
A. Input device
B. Output device
C. Main circuit board of computer
D. Storage device
✅ Correct Answer: C
Explanation:
The motherboard is the main circuit board that connects all components of the computer, including CPU, memory, and storage devices. It allows communication between hardware parts and provides power and data pathways for smooth operation.
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