How many bits are there in a single byte of data? MCQ with Answer and Explanation

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How many bits are there in a single byte of data?

A. 32 bits

B. 16 bits

C. 4 bits

D. 8 bits

Answer: Option D

Solution (By JKSSB Mock Tests)

By universal definition in computer architecture, one byte is comprised of exactly eight bits.

This question belongs to: Computer Memory and Storage Devices

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Question #1

What is the typical speed of a Blu-ray drive at 2x?

A. 18 MB/s

B. 36 MB/s

C. 4.5 MB/s

D. 9 MB/s

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Correct Answer: Option D

Explanation:
1x Blu-ray = 4.5 MB/s, so 2x = 9 MB/s.

This question belongs to: Computer Memory and Storage Devices

Question #2

What is the typical access time of a CD-ROM drive?

A. About 0.1 ms

B. About 10 ms

C. About 100 ms

D. About 1 ms

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Correct Answer: Option C

Explanation:
CD-ROM drives have access times around 100-200 ms. Hard disks are around 5-10 ms, and SSDs are

This question belongs to: Computer Memory and Storage Devices

Question #3

Which unit is commonly used to express hard disk capacity?

A. Bits

B. Bytes

C. Watts

D. Hertz

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Correct Answer: Option B

Explanation:
Hard disk capacity is typically expressed in bytes (e.g., gigabytes, terabytes). Bits are used for data rates, hertz for frequency, and watts for power.

This question belongs to: Computer Memory and Storage Devices

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