What is the physical medium used in a hard disk to store data? MCQ with Answer and Explanation

Question
What is the physical medium used in a hard disk to store data?
A. Metallic tape
B. Silicon chips
C. Aluminum or glass platters coated with magnetic material
D. Polycarbonate layer
Answer: Option C
Solution (By JKSSB Mock Tests)
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
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Practice More Memory and Storage Devices Questions

Question #1
Which architectural feature prevents a user from accidentally installing a DDR4 RAM module into a DDR5 motherboard slot?
A. A physically offset structural alignment notch
B. Magnetic resistance shields
C. Color-coded connector pins
D. An automatic software warning beep
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Correct Answer: Option A

Explanation:
Each generation of DDR memory features a physical alignment notch carved into a unique position along the pin edge to prevent incompatible physical installation.
This question belongs to: Computer Memory and Storage Devices
Question #2
What is the function of the memory management unit (MMU) in virtual memory?
A. To control the memory bus
B. To allocate disk space
C. To translate virtual addresses to physical addresses
D. To manage cache memory
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Correct Answer: Option C

Explanation:
The MMU performs address translation from virtual addresses used by programs to physical addresses in RAM, enabling virtual memory.
This question belongs to: Computer Memory and Storage Devices
Question #3
What technology is used in pen drives (USB flash drives) to retain data without a power source?
A. Static RAM
B. Optical Storage
C. Magnetic Storage
D. Flash Memory (EEPROM)
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Correct Answer: Option D

Explanation:
Pen drives use NAND flash memory, which is a type of electrically erasable programmable read-only memory (EEPROM) that functions without moving parts.
This question belongs to: Computer Memory and Storage Devices
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