Operating System (OS)
Thrashing can be avoided if

the speed of CPU is increased
the speed of I/O processor is increased
All of these
the pages, belonging to the working set of the programs, are in main memory
None of these

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Operating System (OS)
System generation:

is always quite simple
varies in difficulty between systems
is always very difficult
None of these
requires extensive tools to be understandable

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

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