What is the function of the Android 'Power Manager'? MCQ with Answer and Explanation

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What is the function of the Android 'Power Manager'?

A. To manage network connectivity

B. To control screen brightness

C. To manage device power states and battery optimization

D. To handle CPU frequency scaling

Answer: Option C

Solution (By JKSSB Mock Tests)

Power Manager controls power-saving features, sleep modes, and monitors battery usage to extend battery life.

This question belongs to: Computer Operating Systems

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Question #1

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What is the default process management command used in Linux to change the scheduling priority of an already running process?

A. nice

B. renice

C. kill

D. chmod

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Correct Answer: Option B

Explanation:
While 'nice' sets process priority during initial launch, the 'renice' command alters the priority tier of an already active running process ID.

This question belongs to: Computer Operating Systems

Question #2

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In a symmetric multiprocessing (SMP) system, how are the processing responsibilities shared among available CPUs?

A. One primary CPU controls all other slave CPUs and handles all hardware input/output exclusively.

B. All processors share the same physical memory space and run tasks simultaneously under equal peer status.

C. Processors are restricted to executing only application software, never OS tasks.

D. Only one processor can be active at any given minute while others stay idle.

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Correct Answer: Option B

Explanation:
In Symmetric Multiprocessing (SMP), multiple peer processors share a common main memory and execute threads concurrently under equal standing.

This question belongs to: Computer Operating Systems