What is the function of the Android 'AlarmManager'? MCQ with Answer and Explanation

Question
What is the function of the Android 'AlarmManager'?
A. To manage notifications
B. To schedule wake-up events or actions at specific times
C. To control power saving
D. To set system alarms
Answer: Option B
Solution (By JKSSB Mock Tests)
AlarmManager allows scheduling tasks to run at precise times, even if the device is asleep, by waking it up.
This question belongs to: Computer Operating Systems
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Practice More Operating Systems Questions

Question #1
Which Linux command is used to change the permissions of a file?
A. umask
B. chown
C. chmod
D. chgrp
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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
Question #2
Which system state preserves open documents and applications to the hard drive or SSD, and then shuts down power completely?
A. Sleep Mode
B. Restart Mode
C. Log Off Mode
D. Hibernate Mode
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Correct Answer: Option D

Explanation:
Hibernate mode saves current system state data directly onto the hard disk (hiberfil.sys) and powers off the machine completely, consuming zero electricity.
This question belongs to: Computer Operating Systems
Question #3
In Linux, the 'dd' command is used for:
A. Copying and converting data at a low level
B. Displaying disk usage
C. Deleting directories
D. Duplicating files
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Correct Answer: Option A

Explanation:
dd is a powerful utility for block-level copying, creating disk images, and data conversion.
This question belongs to: Computer Operating Systems
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