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
None of these
they are available on magnetic tapes
they are initially stored on disk
they are memory resident

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Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

branches off to the interrupt service routine immediately
hands over control of address bus and data bus to the interrupting device
branches off to the interrupt service routine after completion of the current instruction
halts for a predetermined time
None of these

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Operating System (OS)
Seeks analysis

is only shown on real-time displays
is used for analyzing device busy problems
is used for analyzing control-unit busy problems
is used for analyzing paging problems
None of these

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