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

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Operating System (OS)
Object code

must be "loaded" before execution
None of these
must be rewritten before execution
is ready to execute
is the output of compilers, but not assemblers

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Operating System (OS)
Which of the following statement is true.

Thrashing is a natural consequence of virtual memory systems.
The LRU algorithm pages out pages that have been used recently
All of these
None of these
Seek analysis is used for analysing control-unit busy problems.

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