Operating System (OS)
The instruction register

None of these
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 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.
is a hardware memory device which denotes the location of the current instruction being executed.

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Operating System (OS)
The Storage-to-Storage instructions

which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also
All of these
which perform indicated operations on two fast registers of the machine and have the result in one of the registers
have both their operands in the main store.
None of these

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Operating System (OS)
Thrashing can be avoided if

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

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