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
multiplexes the inputs and updates the memory accordingly
decides correct alternative by analysing several ones

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Operating System (OS)
Under virtual storage,

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

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Operating System (OS)
File record length

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

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