Operating System (OS)
The problem of thrashing is affected significantly by:

All of these
primary-storage size
program size
program structure
None of these

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Operating System (OS)
The instruction register

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

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Operating System (OS)
Under virtual storage,

None of these
only the active pages of a program are stored in primary storage
interprogram interference may occur
two or more programs are stored concurrently in primary storage
a single program is processed by two or more CPUs

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