Operating System (OS)
Block or buffer caches are used

None of these
to handle interrupts
to increase the capacity of main memory
to improve disk performance
to speed up main memory read operation

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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
Provides an interface for user to interact with computer
Managing hardware on the computer
Controlling the access that application program has to the CPU

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