Operating System (OS)
Scheduling is

unrelated to performance consideration
allowing jobs to use the processor
None of these
the same regard-less of the purpose of the system
not required in uniprocessor systems

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

None of these
they are memory resident
they are available on magnetic tapes
they are initially stored on disk
they are partly in primary memory and partly on disk

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