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

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

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Operating System (OS)
System maintenance:

is necessary on all systems, regardless of how good
None of these
is usually not necessary
always requires several programs
is not required if the system is well written

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Operating System (OS)
What is the meaning of "Hibernate" in Windows XP/Windows 7?

Shutdown the Computer terminating all the running applications
Restart the Computer in safe mode
Restart the Computer in hibernate mode
Shutdown the Computer without closing the running applications

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