Operating System (OS)
Sleep is a good mode to use because

All of the listed here
It consumes low battery when you start it again
It makes computer fresh after it wakes up
It saves power which in true is saving money

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Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

suspending some of the processes when the CPU load is high
bring processes from the disk to the main memory
None of these
assigning ready process to the CPU
swapping a process to the disk

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Operating System (OS)
The function(s) of file system is (are):

All of these
None of these
to provide for long and short term storage of files with appropriate economic tradeoffs.
to provide complete file naming freedom to the users and to permit controlled sharing of files
to provide security against loss of information due to system failure

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