Operating System (OS)
Four necessary conditions for deadlock to exist are: mutual exclusion, no-preemption, circular wait and

None of these
deadlock avoidance
buffer overflow
hold and wait
race around condition

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Operating System (OS)
What is dispatch latency ?

None of the listed here
The time taken by the dispatcher to stop one process and start another
The time taken by the processor to write a file into disk
The whole time taken by all processor

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