Which unit of storage represents exactly $2^{40}$ bytes of data? MCQ with Answer and Explanation

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

A. 1 Petabyte

B. 1 Megabyte

C. 1 Terabyte

D. 1 Gigabyte

Answer: Option C

Solution (By JKSSB Mock Tests)

$2^{10}$ 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

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Question #1

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What technology allows a computer system to read data from multiple hard drives simultaneously to improve performance or provide fault tolerance?

A. SATA

B. NVMe

C. DMA

D. RAID

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Correct Answer: Option D

Explanation:
RAID (Redundant Array of Independent Disks) is a data storage virtualization technology that combines multiple physical hard drive components into a single logical unit for redundancy or performance.

This question belongs to: Computer Memory and Storage Devices

Question #2

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Which of the following is a type of memory that is directly accessible by the CPU without address translation?

A. Physical memory

B. Cache memory

C. Registers

D. Virtual memory

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Correct Answer: Option C

Explanation:
Registers are directly accessible by the CPU's execution units; they are part of the CPU. Physical memory (RAM) is accessed via addresses, and virtual memory requires translation.

This question belongs to: Computer Memory and Storage Devices