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

All of these
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.
to provide security against loss of information due to system failure
None of these

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

None of these
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 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)
Fork is

the dispatching of a task
the creation of a new job
the creation of a new process
increasing the priority of a task
None of these

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Operating System (OS)
Memory management is :

replaced with virtual memory on current systems
critical for even the simplest operating systems
not used on multiprogramming systems
None of these
not used in modern operating system

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