Which unit is used to measure the rotational speed of a hard disk? MCQ with Answer and Explanation

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Which unit is used to measure the rotational speed of a hard disk?

A. RPM (Revolutions Per Minute)

B. Hz

C. MB/s

D. MS

Answer: Option A

Solution (By JKSSB Mock Tests)

Hard disk rotational speed is measured in RPM, e.g., 5400 RPM, 7200 RPM, or higher. Higher RPM generally results in faster read/write performance.

This question belongs to: Computer Memory and Storage Devices

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Question #1

What is the function of a memory slot on a motherboard?

A. To provide power to the system

B. To connect the RAM module

C. To hold the CPU

D. To attach the hard disk

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Correct Answer: Option B

Explanation:
Memory slots (DIMM slots) are used to install RAM modules onto the motherboard, providing the connection between RAM and the memory bus.

This question belongs to: Computer Memory and Storage Devices

Question #2

What is the typical capacity of a DVD-RW disc?

A. 4.7 GB

B. 8.5 GB

C. 25 GB

D. 700 MB

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Correct Answer: Option A

Explanation:
DVD-RW has a capacity of 4.7 GB (single-layer). Dual-layer rewritable discs exist but are less common.

This question belongs to: Computer Memory and Storage Devices

Question #3

What is the unit of measurement for memory speed in RAM?

A. MB/s

B. Both A and C

C. MHz

D. MT/s

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Correct Answer: Option B

Explanation:
RAM speed is often measured in MHz (cycles per second) and MT/s (megatransfers per second) for DDR modules, where the effective data rate is double the clock frequency.

This question belongs to: Computer Memory and Storage Devices

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