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. MS

B. RPM (Revolutions Per Minute)

C. Hz

D. MB/s

Answer: Option B

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 does the term 'seek time' refer to in a hard disk drive?

A. Time to rotate the disk

B. Time to move the head to the correct track

C. Time to transfer data to the computer

D. Time to read data from the sector

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Correct Answer: Option B

Explanation:
Seek time is the time taken for the read/write head to move to the correct track (cylinder) on the platter where the data is stored.

This question belongs to: Computer Memory and Storage Devices

Question #2

What is the typical power consumption of a 3.5-inch hard disk drive?

A. About 20-30 watts

B. About 1-2 watts

C. About 5-10 watts

D. About 50 watts

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Correct Answer: Option C

Explanation:
A typical 3.5-inch HDD consumes around 5 to 10 watts during operation, while 2.5-inch drives use less (2-3 watts). SSDs consume even less.

This question belongs to: Computer Memory and Storage Devices

Question #3

What is the function of the 'read' operation in memory?

A. To retrieve data from a memory location

B. To clear a memory location

C. To store data to a memory location

D. To move data between registers

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Correct Answer: Option A

Explanation:
A read operation fetches data from a specified memory address and transfers it to the CPU or another component.

This question belongs to: Computer Memory and Storage Devices

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