Computer Science
Multiple Choice
Questions
(MCQs) – Sets 18
with Detailed Explanations
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SET 18 – Computer Science MCQs
✅ No repetition from Sets 1–17
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is cache memory?
A. Permanent storage
B. External memory
C. Very fast memory close to CPU
D. Input device
✅ Correct Answer: C
Explanation:
Cache memory is a small, very fast memory located close to or inside the CPU. It stores frequently used data and instructions so the processor can access them quickly. Cache memory improves system performance by reducing the time needed to fetch data from main memory like RAM.
2. What is the main function of the Control Unit (CU)?
A. Store data
B. Perform calculations
C. Direct operations of the CPU
D. Display output
✅ Correct Answer: C
Explanation:
The Control Unit is part of the CPU that manages and directs all operations of the computer. It instructs the Arithmetic Logic Unit and memory on what tasks to perform. The Control Unit ensures that instructions are executed in the correct sequence, maintaining smooth system functioning.
3. What is the Arithmetic Logic Unit (ALU) used for?
A. Data storage
B. Input processing
C. Performing calculations and logical operations
D. Software installation
✅ Correct Answer: C
Explanation:
The Arithmetic Logic Unit performs mathematical calculations such as addition and subtraction, and logical operations like comparison. It is a key component of the CPU. The ALU processes data received from memory and sends results back, playing a crucial role in program execution.
4. What is a bus in computer architecture?
A. A vehicle
B. Software tool
C. Pathway for data transfer
D. Memory unit
✅ Correct Answer: C
Explanation:
A bus is a communication system that transfers data, addresses, and control signals between components like CPU, memory, and input/output devices. Buses allow different parts of the computer to communicate efficiently. Examples include data bus, address bus, and control bus.
5. What is a data bus?
A. Transfers instructions only
B. Transfers memory addresses
C. Transfers actual data
D. Controls system operations
✅ Correct Answer: C
Explanation:
A data bus carries actual data between the CPU, memory, and input/output devices. Its width determines how much data can be transferred at one time. A wider data bus improves system performance by allowing more data to be moved simultaneously.
6. What is an address bus?
A. Transfers data
B. Carries memory locations
C. Displays output
D. Stores information
✅ Correct Answer: B
Explanation:
An address bus carries the address of the memory location where data is to be read from or written to. It allows the CPU to specify which memory or I/O device it wants to access. The size of the address bus determines the maximum memory the system can support.
7. What is a control bus?
A. Transfers numbers
B. Transfers memory
C. Carries control signals
D. Stores addresses
✅ Correct Answer: C
Explanation:
The control bus carries control signals from the Control Unit to other components. These signals coordinate and manage operations such as read, write, and interrupt requests. The control bus ensures proper timing and synchronization of computer activities.
8. What is a motherboard?
A. Input device
B. Storage device
C. Main circuit board of a computer
D. Output device
✅ Correct Answer: C
Explanation:
The motherboard is the main circuit board that connects all computer components, including CPU, RAM, storage, and peripherals. It allows communication between hardware parts and distributes power. Without a motherboard, a computer system cannot function.
9. What is a chipset?
A. Software program
B. Collection of integrated circuits controlling data flow
C. Input device
D. Output device
✅ Correct Answer: B
Explanation:
A chipset is a group of integrated circuits on the motherboard that manage data flow between the CPU, memory, and peripherals. It controls system performance and compatibility. The chipset determines what hardware features a system can support.
10. What is overheating in computers?
A. Fast processing
B. Low power usage
C. Excessive heat damaging components
D. Normal operation
✅ Correct Answer: C
Explanation:
Overheating occurs when a computer’s components generate more heat than the cooling system can remove. Excessive heat can damage hardware, slow performance, or cause system shutdowns. Proper ventilation, cooling fans, and thermal paste help prevent overheating.
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