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
Controlling the access that application program has to the CPU
Managing hardware on the computer

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Operating System (OS)
A Processor

is a device that performs a sequence of operations specified by instructions in memory.
is a sequence of instructions
is the device where information is stored
None of these
is typically characterized by interactive processing and time of the CPU

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Operating System (OS)
A spooler is a

Message sent from the printer to the operating system when a print job is completed
Program that coordinates the print job that are waiting to process
Location in memory that maintains the contents of documents until it prints
Queue of print job that are waiting to print

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Operating System (OS)
Semaphores

None of these
synchronize critical resources to prevent deadlock
are used to do I/O
synchronize critical resources to prevent contention
are used for memory management

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