Which component acts as the 'brain' of the computer system, housing the circuitry that executes all primary logical and arithmetic procedures? MCQ with Answer and Explanation

Question

Which component acts as the 'brain' of the computer system, housing the circuitry that executes all primary logical and arithmetic procedures?

A. Motherboard Bus

B. Central Processing Unit

C. Random Access Memory

D. Hard Disk Drive

Answer: Option B

Solution (By JKSSB Mock Tests)

The Central Processing Unit (CPU) is known as the brain because it interprets instructions, handles calculations, and runs operations.

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Question #1

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Which component is used to store the BIOS?

A. ROM

B. RAM

C. Hard disk

D. Cache

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Correct Answer: Option A

Explanation:
BIOS is stored in ROM, which is non-volatile.

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Question #2

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What type of operating systems and user interfaces were primarily used during the third generation of computers?

A. Graphical User Interface (GUI)

B. Time-sharing and Remote-processing Operating Systems

C. Gesture-based Interface

D. Command Line Interface (CLI) with batch processing

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Correct Answer: Option B

Explanation:
The third generation (IC era) saw the introduction of multi-programming, time-sharing, and early operating systems that allowed remote terminal access.

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Question #3

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What is the primary function of the input unit in any digital computer architecture?

A. To convert human-readable input data into machine-understandable binary format.

B. To display the visual results of calculations.

C. To run complex mathematical operations.

D. To store processed records permanently.

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Correct Answer: Option A

Explanation:
The input unit captures external data from the real world and translates it into digital signals (binary) that the CPU can execute.

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