Which of the following is a type of optical disc that is read-only? MCQ with Answer and Explanation

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Which of the following is a type of optical disc that is read-only?

A. DVD-RAM

B. CD-R

C. Blu-ray ROM (BD-ROM)

D. DVD-RW

Answer: Option C

Solution (By JKSSB Mock Tests)

BD-ROM is read-only. CD-R and DVD-R are recordable once, DVD-RW and DVD-RAM are rewritable.

This question belongs to: Computer Memory and Storage Devices

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What is the typical capacity of a microSD card used in smartphones as of 2026?

A. Only 32 GB

B. 2-8 GB

C. 16-512 GB

D. Up to 1 TB

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Correct Answer: Option C

Explanation:
MicroSD cards in 2026 commonly range from 16 GB to 512 GB, with 1 TB cards available but less common. The typical range is 16-512 GB for consumer use.

This question belongs to: Computer Memory and Storage Devices

Question #2

How many bits are contained within a data block size of exactly 4 Bytes?

A. 128 bits

B. 16 bits

C. 32 bits

D. 64 bits

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Correct Answer: Option C

Explanation:
Since one byte is strictly defined as 8 bits, a 4-byte block contains exactly $4 imes 8 = 32$ bits.

This question belongs to: Computer Memory and Storage Devices

Question #3

What is the typical capacity of a Blu-ray disc for 4K movies?

A. 25 GB

B. 100 GB (triple layer)

C. 128 GB

D. 50 GB (dual layer)

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Correct Answer: Option B

Explanation:
Ultra HD Blu-ray discs for 4K movies often use triple-layer discs of 100 GB capacity, though dual-layer 50 GB is also used.

This question belongs to: Computer Memory and Storage Devices

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