Operating System (OS)
The instruction register

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.
is a hardware memory device which denotes the location of the current instruction being executed.
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".
None of these

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Operating System (OS)
Scheduling is

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

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Operating System (OS)
What is dispatch latency ?

None of the listed here
The whole time taken by all processor
The time taken by the processor to write a file into disk
The time taken by the dispatcher to stop one process and start another

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