What is the typical speed of a 5400 RPM hard disk in terms of average latency? MCQ with Answer and Explanation

What is the typical speed of a 5400 RPM hard disk in terms of average latency?
A. 8.33 ms
B. 5.56 ms
C. 11.11 ms
D. 4.17 ms
Answer: Option B
Solution (By JKSSB Mock Tests)
At 5400 RPM, one rotation takes 60/5400 = 0.01111 seconds = 11.11 ms. Average rotational latency is half of that, about 5.56 ms.

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Practice More Memory and Storage Devices Questions

Question #1
Which of the following is a characteristic of a hard disk's platter?
A. It rotates at a constant speed
B. It is made of silicon
C. It stores data in flash cells
D. It is a non-removable part of an SSD

Correct Answer: Option A


Explanation:
Platters in a hard disk rotate at a constant speed (e.g., 7200 RPM). They are made of aluminum/glass with magnetic coating, not silicon, and are used in HDDs, not SSDs.

This question belongs to: Computer Memory and Storage Devices
Question #2
Which of the following is a valid memory unit in the SI system?
A. Kilobit
B. Gigabit
C. All of the above
D. Megabyte

Correct Answer: Option C


Explanation:
Bits and bytes with SI prefixes (kilo, mega, giga) are all valid units. However, in computing, binary multiples are more common for memory capacities.

This question belongs to: Computer Memory and Storage Devices
Question #3
What structural issue happens when data files are written, deleted, and modified repeatedly, causing a mechanical hard drive's storage space to become scattered across non-contiguous areas?
A. Decryption
B. Degradation
C. Fragmentation
D. Thrashing

Correct Answer: Option C


Explanation:
Fragmentation occurs when files are broken up and saved in scattered, non-contiguous clusters across a mechanical disk, forcing the drive heads to move more and slowing access times.

This question belongs to: Computer Memory and Storage Devices