Operating System (OS)
What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

XENIX
UNIX
None of these
MS DOS
OS/2

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Operating System (OS)
A co-processor

Is quite common in modern computer
Causes all processor to function equally
Works with any application
Is relatively easy to support in software

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

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