Which of the following is a characteristic of a magnetic disk? MCQ with Answer and Explanation

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Which of the following is a characteristic of a magnetic disk?

A. Data is stored magnetically on a circular platter

B. Data is stored in flash cells

C. Data is stored in pits

D. Data is stored using laser

Answer: Option A

Solution (By JKSSB Mock Tests)

Hard disk drives store data magnetically on rotating platters. Optical discs use pits, and SSDs use flash cells.

This question belongs to: Computer Memory and Storage Devices

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Question #1

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What is the name of the high-speed data transfer mechanism that allows specific hardware subsystems to access main system memory independently of the central processing unit?

A. Bus Mastering

B. Interrupt Request (IRQ)

C. Paging Protocol

D. Direct Memory Access (DMA)

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Correct Answer: Option D

Explanation:
DMA (Direct Memory Access) allows peripherals like network cards or graphics adapters to read/write directly to system RAM without routing the data through the CPU, reducing processor overhead.

This question belongs to: Computer Memory and Storage Devices

Question #2

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What is the physical medium used in a hard disk to store data?

A. Polycarbonate layer

B. Aluminum or glass platters coated with magnetic material

C. Metallic tape

D. Silicon chips

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Correct Answer: Option B

Explanation:
Hard disks use platters made of aluminum or glass, coated with a thin magnetic layer that stores data in the form of magnetized regions.

This question belongs to: Computer Memory and Storage Devices

Question #3

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What is the function of a buffer in a hard disk?

A. To temporarily hold data during read/write operations to smooth data flow

B. To store frequently used data for faster access

C. To protect against data loss

D. To increase the disk's capacity

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Correct Answer: Option A

Explanation:
A buffer (or disk cache) in a hard disk is a small amount of RAM used to temporarily hold data being read from or written to the disk, improving performance by reducing access time.

This question belongs to: Computer Memory and Storage Devices

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