What is the purpose of the Android 'WallpaperService'? MCQ with Answer and Explanation

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What is the purpose of the Android 'WallpaperService'?

A. To set wallpapers

B. To create live wallpapers that run as a service

C. To draw wallpapers

D. To manage wallpapers

Answer: Option B

Solution (By JKSSB Mock Tests)

WallpaperService is the base class for live wallpapers, enabling animations and interactive backgrounds.

This question belongs to: Computer Operating Systems

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What is the primary advantage of using a virtual machine (VM) within an OS?

A. To simplify file management

B. To improve system performance

C. To reduce memory usage

D. To run multiple operating systems on a single physical machine

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Correct Answer: Option D

Explanation:
Virtualization allows running isolated guest OSes on one host, enabling testing, legacy support, and efficient resource use.

This question belongs to: Computer Operating Systems

Question #2

What is the maximum number of primary partitions supported by an MBR disk?

A. 4

B. Unlimited

C. 3

D. 128

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Correct Answer: Option A

Explanation:
MBR (Master Boot Record) allows up to four primary partitions, or three primary and one extended partition with logical drives.

This question belongs to: Computer Operating Systems

Question #3

Which Linux command is used to view the system's boot messages?

A. journalctl

B. messages

C. dmesg

D. bootlog

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Correct Answer: Option C

Explanation:
dmesg prints the kernel ring buffer messages, including boot-time logs; journalctl for systemd logs.

This question belongs to: Computer Operating Systems

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