Which technology is used in Blu-ray discs to achieve higher capacity? MCQ with Answer and Explanation

Question
Which technology is used in Blu-ray discs to achieve higher capacity?
A. Red laser
B. Ultraviolet laser
C. Infrared laser
D. Blue-violet laser
Answer: Option D
Solution (By JKSSB Mock Tests)
Blu-ray discs use a blue-violet laser with a shorter wavelength (405 nm) than the red laser used in DVDs (650 nm), allowing smaller pits and more data per area.
This question belongs to: Computer Memory and Storage Devices
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Practice More Memory and Storage Devices Questions

Question #1
Which computer memory is used to store the bootstrap loader program that initializes the system when powered on?
A. Hard Disk
B. Cache
C. RAM
D. ROM
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Correct Answer: Option D

Explanation:
The BIOS/bootstrap loader is stored in non-volatile ROM (Read-Only Memory) so it is retained even when the computer is turned off.
This question belongs to: Computer Memory and Storage Devices
Question #2
Which of the following storage devices has the largest storage capacity per unit cost?
A. Magnetic tape
B. Blu-ray disc
C. Hard disk
D. SSD
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Correct Answer: Option A

Explanation:
Magnetic tape offers the lowest cost per gigabyte, making it ideal for massive archival storage, though access is slow.
This question belongs to: Computer Memory and Storage Devices
Question #3
Which of the following is a type of memory that uses a rotating disk?
A. Flash memory
B. SSD
C. Hard disk
D. RAM
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Correct Answer: Option C

Explanation:
Hard disk drives use rotating platters to store data magnetically. SSDs and flash memory have no moving parts.
This question belongs to: Computer Memory and Storage Devices
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