MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -The basic operation of a computer is called the ‘fetch-execute’ cycle. The CPU is designed to understand a set of instructions-the instruction set. It fetches the instructions from the main memory and executes them. This is done repeatedly from when the computer is booted up to when it is shut down.

Detailed explanation-2: -The processor sends a signal along the address bus to the memory address held in the MAR. The instruction/data held in that memory address is sent along the data bus to the MBR/MDR . The instruction/data held in the MBR/MDR is copied into the CIR . The instruction/data held in the CIR is decoded and then executed.

Detailed explanation-3: -The Central Processing Unit (CPU) is the brain of the computer because it is what makes all the decisions and it is where all programs are executed. The purpose of the CPU is to process data. The CPU works by following a process known as ‘fetch, decode and execute’.

Detailed explanation-4: -Explanation: The fetch execution cycle refers to the execution of instructions by the CPU. This is a multi-step process in which instructions are fetched, decoded, executed, and then stored. The result of this cycle allows an instruction to be executed by the CPU allowing the process cycle to continue.