Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

bring processes from the disk to the main memory
suspending some of the processes when the CPU load is high
swapping a process to the disk
None of these
assigning ready process to the CPU

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Operating System (OS)
The instruction register

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".
contains the address of the memory location that is to be read from or stored into.
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.

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