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

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

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Operating System (OS)
A spooler is a

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

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Operating System (OS)
The Memory Address Register

is a hardware memory device which denotes the location of the current instruction being executed.
None of these
contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

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