Operating System (OS)
System maintenance:

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

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Operating System (OS)
Memory management is :

critical for even the simplest operating systems
replaced with virtual memory on current systems
None of these
not used in modern operating system
not used on multiprogramming systems

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

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

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