MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -The instruction after obtained from the PC, is decoded and operands are fetched and stored in the IR.

Detailed explanation-2: -In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU’s control unit that holds the instruction currently being executed or decoded.

Detailed explanation-3: -The IR is used to store the instruction word. When the CPU fetches an instruction from memory, it is temporarily stored in the IR.

Detailed explanation-4: -In a computer, the memory address register (MAR) is the CPU register that either stores the memory address from which data will be fetched to the CPU registers, or the address to which data will be sent and stored via system bus.

Detailed explanation-5: -A CU typically uses a binary decoder to convert coded instructions into timing and control signals that direct the operation of the other units (memory, arithmetic logic unit and input and output devices, etc.).