Operating System (OS)
The function(s) of file system is (are):

to provide complete file naming freedom to the users and to permit controlled sharing of files
to provide for long and short term storage of files with appropriate economic tradeoffs.
None of these
to provide security against loss of information due to system failure
All of these

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

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

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Operating System (OS)
The Memory Buffer Register (MBR)

contains the address of the memory location that is to be read from or stored into.
None of these
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".
is a hardware memory device which denotes the location of the current instruction being executed.

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