What is the typical capacity of a standard dual-layer Blu-ray disc? MCQ with Answer and Explanation

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What is the typical capacity of a standard dual-layer Blu-ray disc?

A. 128 GB

B. 25 GB

C. 50 GB

D. 100 GB

Answer: Option C

Solution (By JKSSB Mock Tests)

Dual-layer Blu-ray (BD-50) holds 50 GB. Triple-layer (BD-100) holds 100 GB. Quad-layer (BD-128) holds 128 GB, but standard dual-layer is 50 GB.

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Question #1

Which unit of storage represents exactly $2^{40}$ bytes of data?

A. 1 Terabyte

B. 1 Megabyte

C. 1 Gigabyte

D. 1 Petabyte

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Correct Answer: Option A

Explanation:
$2^{10}$ is Kilobyte, $2^{20}$ is Megabyte, $2^{30}$ is Gigabyte, and $2^{40}$ is Terabyte. Thus, $2^{40}$ bytes equals 1 Terabyte (TB).

This question belongs to: Computer Memory and Storage Devices

Question #2

Which of the following is a type of memory that uses magnetic domains to store data?

A. DRAM

B. Hard disk

C. Flash memory

D. CD-ROM

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Correct Answer: Option B

Explanation:
Hard disks store data magnetically on platters. Flash uses charge traps, optical uses pits, DRAM uses capacitors.

This question belongs to: Computer Memory and Storage Devices

Question #3

Which of the following is a type of memory that is used for storing data in a mobile phone?

A. DRAM

B. eMMC

C. All of the above

D. SRAM

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Correct Answer: Option C

Explanation:
Mobile phones use eMMC or UFS for storage, DRAM for main memory, and SRAM for cache in the processor.

This question belongs to: Computer Memory and Storage Devices

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