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

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

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Operating System (OS)
Under virtual storage,

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

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Operating System (OS)
File record length

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

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