Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

detects/corrects errors
None of these
inquires to see if a terminal has any transaction to send
decides correct alternative by analysing several ones
multiplexes the inputs and updates the memory accordingly

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

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Operating System (OS)
The dispatcher

puts tasks in I/O wait
actually schedules the tasks into the processor
is always small and simple
never changes task priorities
None of these

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