What does 'Thrashing' indicate in virtual memory system logs? MCQ with Answer and Explanation

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What does 'Thrashing' indicate in virtual memory system logs?

A. The CPU core is overheating due to intense graphic gaming.

B. The hard drive is performing a high-speed defragmentation sweep.

C. The system is spend overwhelmingly more time handling page swaps than processing actual application operations.

D. A network link is heavily saturated with incoming packets.

Answer: Option C

Solution (By JKSSB Mock Tests)

Thrashing signals a severe memory deficit where the OS continuously pages data back and forth from disk, dropping productive execution to near zero.

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Question #1

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Which of the following is a valid file permission represented in octal for a directory with rwx for owner, rx for group, and rx for others?

A. 550

B. 755

C. 644

D. 700

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Correct Answer: Option B

Explanation:
755 = owner rwx (4+2+1), group rx (4+1), others rx (4+1).

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Question #2

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In Linux, the 'lsblk' command is used to:

A. Display disk usage

B. Show disk partitions only

C. List block devices (like disks and partitions) in a tree format

D. List mounted file systems

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Correct Answer: Option C

Explanation:
lsblk shows all block devices, their sizes, and mount points in a hierarchical view.

This question belongs to: Computer Operating Systems

Question #3

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What is the primary function of the 'Shell' component in Linux distributions?

A. To compile application source code.

B. To provide physical protection to storage devices.

C. To manage physical RAM refresh cycles.

D. To interpret text-based commands from the user and interface with the operating system kernel.

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Correct Answer: Option D

Explanation:
The shell is a command language interpreter that executes commands entered via text terminals or input shell script sequences.

This question belongs to: Computer Operating Systems

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