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Operating Systems Concepts - Engineering

Q1:

The instruction register

A is a hardware memory device which denotes the location of the current instruction being executed.

B is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

C contains the address of the memory location that is to be read from or stored into.

D 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".

E None of the above

ANS:B - is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

Instruction register (IR) : is the part of a CPU's control unit that holds the instruction currently being executed by the CPU.

So, the correct answer will be A.