Which Linux command shows the list of mounted file systems? MCQ with Answer and Explanation

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Which Linux command shows the list of mounted file systems?

A. df

B. lsblk

C. fstab

D. mount

Answer: Option D

Solution (By JKSSB Mock Tests)

mount without arguments displays all currently mounted file systems; df also shows mounts but with usage.

This question belongs to: Computer Operating Systems

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Question #1

Which Linux command is used to check the disk space usage of the root file system?

A. lsblk /

B. fdisk -l

C. du -sh /

D. df -h /

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Correct Answer: Option D

Explanation:
df -h / shows used/available space on the root partition; du -sh / calculates total size of all files under /, which is heavy.

This question belongs to: Computer Operating Systems

Question #2

Which of the following is a type of scheduler that selects the next process to run from the ready queue?

A. Medium-term scheduler

B. Long-term scheduler (job scheduler)

C. Short-term scheduler (CPU scheduler)

D. I/O scheduler

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Correct Answer: Option C

Explanation:
The short-term scheduler selects a process from ready queue and dispatches it to the CPU; occurs frequently.

This question belongs to: Computer Operating Systems

Question #3

Which Linux command is used to change the permissions of a file?

A. umask

B. chgrp

C. chmod

D. chown

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Correct Answer: Option C

Explanation:
The chmod (change mode) command modifies file permissions (read, write, execute) for owner, group, and others.

This question belongs to: Computer Operating Systems

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