Operating System (OS)
System maintenance:

is usually not necessary
always requires several programs
is not required if the system is well written
is necessary on all systems, regardless of how good
None of these

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Operating System (OS)
All of the following are task performed by the operating system except

Provides an interface for user to interact with computer
Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation
Controlling the access that application program has to the CPU

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Operating System (OS)
What is dispatch latency ?

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

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