MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -The CPU is now ready to carry out the fetch decode execute cycle. The Control Unit sends a signal to the RAM in order to fetch the program and data, which is then stored in one of the CPU’s register. To do so, the CPU makes use of a vital hardware path called the ‘address bus’ along which the program and data travels.

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: -Address bus-carries memory addresses from the processor to other components such as primary memory and input/output devices. Data bus-carries the actual data between the processor and other components. Control bus-carries control signals from the processor to other components.

Detailed explanation-4: -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. The CPU fetches the instructions one at a time from the main memory into the registers.

Detailed explanation-5: -During the fetch stage, the address stored in the PC is copied into the memory address register (MAR) and then the PC is incremented in order to “point” to the memory address of the next instruction to be executed.