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

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Operating System (OS)
Fork is

None of these
the creation of a new job
increasing the priority of a task
the creation of a new process
the dispatching of a task

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Operating System (OS)
Addressing modes

All of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
defines the fundamental method of determining effective operand addresses
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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