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

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Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Controlling the fuel injection system of an automobile engines
Controlling access to a shared printer in a network
Ensuring that system clock works correctly on server
Managing the access to system files in a laptop computers

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