What mechanism does an OS use to instantly notify the CPU that an event requiring immediate attention has occurred? MCQ with Answer and Explanation

Question
What mechanism does an OS use to instantly notify the CPU that an event requiring immediate attention has occurred?
A. Interrupt
B. Spooling
C. Thread
D. System Call
Answer: Option A
Solution (By JKSSB Mock Tests)
An interrupt is a hardware or software signal sent to the CPU, causing it to temporarily suspend current tasks to execute an Interrupt Service Routine (ISR).
This question belongs to: Computer Operating Systems
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Practice More Operating Systems Questions

Question #1
Which Linux command is used to copy files or directories?
A. mv
B. cp
C. rsync
D. scp
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Correct Answer: Option B

Explanation:
cp copies files/directories; mv moves/renames; rsync is for synchronization; scp is secure copy over network.
This question belongs to: Computer Operating Systems
Question #2
What is the purpose of the Android 'Vibrator' class?
A. To manage haptic feedback
B. All of the above
C. To control vibration feedback on the device
D. To trigger notifications with vibration
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Correct Answer: Option B

Explanation:
Vibrator allows apps to vibrate the device for notifications, haptic feedback, or custom patterns.
This question belongs to: Computer Operating Systems
Question #3
Which Linux command is used to change the permissions of a file?
A. umask
B. chmod
C. chgrp
D. chown
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Correct Answer: Option B

Explanation:
The chmod (change mode) command modifies file permissions (read, write, execute) for owner, group, and others.
This question belongs to: Computer Operating Systems
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