Operating System (OS)
A page fault

is an access to a page not currently in memory
occurs when a program accesses a page of memory
is an error is a specific page
None of these
is a reference to a page belonging to another program

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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

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

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