Operating System (OS)
All of the following are task performed by the operating system except

Provides an interface for user to interact with computer
Managing hardware on the computer
Controlling the access that application program has to the CPU
Performing housekeeping task like file compression and disk defragmentation

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Operating System (OS)
System maintenance:

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

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Operating System (OS)
Page stealing

Should be the turning goal
Is taking page frame from other working sets
Is a sign of an efficient system
Is taking layer disk space for page in page out

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