NPTEL

Question

Which of the following does not interrupt a running process?

1.  A device

2.  Timer

3.  Power Failure

4.  None of the above

Comments

every one is creating intrrupt. see here

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correct answer is 4.

a device can interrupt the process. like non-maskable interrupt.

timer can also interrupt the process to change the mode from user to kernel.

power failure defintely interrupt the process.

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1.A device

Answer 1

(A),(B) (C) can interrupt a running process.
so option D will be answer 

A: device by generating interrupt.
B: in case of timer running processes will be preempted and next will be scheduled 

C: this interrupt is given the highest priority, Once a power-failure interrupt has been posted, the processor has approximately 4 milliseconds before power is shut down 

https://stackoverflow.com/questions/25946448/what-exactly-happens-in-a-power-fail-interrupt