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

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

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Operating System (OS)
The Memory Address Register

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".
is a hardware memory device which denotes the location of the current instruction being executed.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these

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Operating System (OS)
The dispatcher

actually schedules the tasks into the processor
None of these
is always small and simple
never changes task priorities
puts tasks in I/O wait

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