Which Linux utility command can be used to display system disk space utilization across all mounted partitions? MCQ with Answer and Explanation

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Which Linux utility command can be used to display system disk space utilization across all mounted partitions?

A. top

B. free

C. df

D. du

Answer: Option C

Solution (By JKSSB Mock Tests)

The 'df' (disk free) command displays the amount of available and used disk space on file systems mounted to the Linux machine.

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Question #1

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

A. Display environment variables

B. Make a variable global

C. All of the above

D. Set environment variables that are passed to child processes

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Correct Answer: Option C

Explanation:
export makes shell variables available to subprocesses; without options, it lists exported variables.

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Question #2

Which command in Windows is used to check the integrity of system files?

A. sfc /scannow

B. dism

C. chkdsk

D. systeminfo

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Correct Answer: Option A

Explanation:
System File Checker (sfc /scannow) scans and repairs corrupted system files in Windows.

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Question #3

In operating systems, what is the primary function of the 'Medium-Term Scheduler'?

A. To swap processes out of main memory to secondary storage (and vice versa) to control the degree of multiprogramming.

B. To handle real-time peripheral device drivers.

C. To assign processes directly to an available CPU core.

D. To control the initial BIOS POST test routines.

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Correct Answer: Option A

Explanation:
The medium-term scheduler removes processes from main memory temporarily (swapping out) to reduce the degree of multiprogramming and manage memory constraints.

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