Operating System (OS)
The primary purpose of an operating system is to:

allow people to sue the computers
make the most efficient use of the hardware
None of these
make computer easier to use
keep system programmers employed

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Operating System (OS)
A critical region is

a program segment that has not been proved bug-free
a program segment where shared resources are accessed
one which is enclosed by a pair of P and V operations on semaphores
none is the above
a program segment that often causes unexpected system crashes

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Operating System (OS)
What is dispatch latency ?

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

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