Operating System (OS)
Which of the following is not true about the memory management?

paging suffers from internal fragmentation
virtual memory is used only in multi-user systems
segmentation suffers from external fragmentation
None of these
segmented memory can be paged

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Operating System (OS)
The instruction register

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
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.
None of these

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