In Linux, what does the command 'ls -l' display? MCQ with Answer and Explanation

Question
In Linux, what does the command 'ls -l' display?
A. Only file names
B. Detailed file information including permissions, owner, size, and timestamp
C. Hidden files as well
D. Files sorted by size
Answer: Option B
Solution (By JKSSB Mock Tests)
ls -l (long listing) displays permissions, number of links, owner, group, size, date, and filename.
This question belongs to: Computer Operating Systems
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Question #1
In Linux, the command 'rm -rf' is used to:
A. Forcefully remove directories and their contents recursively
B. Rename a file
C. Read a file forcefully
D. Remove empty directories only
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Correct Answer: Option A

Explanation:
rm -rf (remove recursively and forcefully) deletes directories and files without confirmation, so it's dangerous.
This question belongs to: Computer Operating Systems
Question #2
Which area of the Linux file system hierarchy contains specialized pseudo-files that represent physical or virtual devices attached to the computer?
A. /proc
B. /bin
C. /sys
D. /dev
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Correct Answer: Option D

Explanation:
The '/dev' directory contains device nodes or pseudo-files that map directly to hardware peripherals and components like storage volumes or serial ports.
This question belongs to: Computer Operating Systems
Question #3
Which Android component is responsible for managing the user interface and interactions?
A. Service
B. Activity
C. Broadcast Receiver
D. Content Provider
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Correct Answer: Option B

Explanation:
Activities represent screens with UI; they handle user interactions and lifecycle events.
This question belongs to: Computer Operating Systems
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