Which Linux command is used to change the permissions of a file with symbolic notation? MCQ with Answer and Explanation

Question
Which Linux command is used to change the permissions of a file with symbolic notation?
A. chmod u+x file
B. chmod g+w file
C. chmod o-r file
D. All of the above
Answer: Option D
Solution (By JKSSB Mock Tests)
chmod accepts symbolic mode like u+x (add execute for owner), g+w (add write for group), o-r (remove read for others).
This question belongs to: Computer Operating Systems
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Practice More Operating Systems Questions

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What is the purpose of the Linux 'nano' command?
A. To manage network interfaces
B. To set environment variables
C. A simple text editor
D. To view system processes
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Correct Answer: Option C

Explanation:
nano is a user-friendly text editor for the command line, often pre-installed on many Linux distributions.
This question belongs to: Computer Operating Systems
Question #2
In Windows Operating Systems, which system tool is explicitly used to optimize disk space by rearranging fragmented files into contiguous sectors?
A. Disk Defragmenter and Optimize Drives
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Correct Answer: Option A

Explanation:
Disk Defragmenter consolidates fragmented files on a hard drive to improve read/write access speeds and overall system performance.
This question belongs to: Computer Operating Systems
Question #3
Which of the following is a valid Linux file permission value?
A. 700
B. All of the above
C. 755
D. 644
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Correct Answer: Option B

Explanation:
755, 644, and 700 are all valid octal permissions for files/directories in Linux.
This question belongs to: Computer Operating Systems
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