Operating System (OS)
You should choose sleep option when

You are leaving for a very short time and want to resume you work shortly
You finish working and going to bed
When computer gets hanged frequently. Let it sleep for some time
The computer is tired after working for the whole day

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

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

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Operating System (OS)
Virtual Memory

None of these
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
consists of those addresses that may be generated by a processor during execution of a computation.
allows multiple programs to reside in separate areas of core at the time.
is a method of allocating processor time.

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