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

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

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Operating System (OS)
Under virtual storage,

interprogram interference may occur
only the active pages of a program are stored in primary storage
two or more programs are stored concurrently in primary storage
None of these
a single program is processed by two or more CPUs

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Operating System (OS)
File record length

Should always be variable
depends upon the size of the file
None of these
should be chosen to match the data characteristics
should always be fixed

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