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

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

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Operating System (OS)
Thrashing

is a natural consequence of virtual memory systems
can be caused by poor paging algorithms
always occurs on large computers
can always be avoided by swapping
None of these

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Operating System (OS)
System maintenance:

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

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