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

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

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Operating System (OS)
Data encryption

cannot be used by private installations
is mostly used by public networks
is not necessary, since data cannot be intercepted
is mostly used by financial networks
None of these

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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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