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
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
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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Operating System (OS)
File record length

None of these
depends upon the size of the file
should be chosen to match the data characteristics
should always be fixed
Should always be variable

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Operating System (OS)
Capacity planning

is not needed in small installations
does not depend on the monitoring tools available
is independent of the operating system
requires detailed system performance information
None of these

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Operating System (OS)
Scheduling is

allowing jobs to use the processor
unrelated to performance consideration
not required in uniprocessor systems
None of these
the same regard-less of the purpose of the system

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