Which Linux command is used to stop a running service (e.g., Apache)? MCQ with Answer and Explanation

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Which Linux command is used to stop a running service (e.g., Apache)?

A. systemctl stop service

B. service stop

C. pkill service

D. kill -9 PID

Answer: Option A

Solution (By JKSSB Mock Tests)

On systemd-based Linux, systemctl stop is used to stop services; older sysvinit used service command.

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What is the main difference between a process and a thread?

A. A process has its own memory space, while threads share memory within a process

B. Processes are scheduled, threads are not

C. There is no difference

D. Threads are independent, while processes are not

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Correct Answer: Option A

Explanation:
Processes are independent with separate memory; threads are lighter, sharing the same memory space and resources of the parent process.

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Question #2

What is the function of the Windows 'chkdsk' command?

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C. Cleans up temporary files

D. Converts FAT to NTFS

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Correct Answer: Option B

Explanation:
chkdsk (Check Disk) scans the file system and disk sectors for errors and attempts to fix them.

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Question #3

What is the function of the Android 'WifiManager'?

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Correct Answer: Option A

Explanation:
WifiManager provides APIs to enable/disable Wi-Fi, scan for networks, and connect to access points.

This question belongs to: Computer Operating Systems

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