CPU1 - 0478

Which of the following best describes the role of the CPU?

• To permanently store data and programs

• To perform all input and output operations

• To process data and execute instructions

• To control external devices only

The Von Neumann architecture is based on the idea that:

• Data and instructions use separate memory units

• All instructions are hard-wired into the CPU

• Data and instructions share the same memory and bus system

• Each program has its own dedicated CPU

Which register holds the address of the next instruction to be fetched?

• MDR

• CIR

• PC

• ACC

What is stored in the Memory Data Register (MDR)?

• The address of the next instruction

• The actual data being transferred to or from memory

• The current instruction being decoded

• The result of the last arithmetic operation

Which of these registers acts as a temporary holding location for the current instruction?

• CIR

• MAR

• PC

• ALU

The Arithmetic Logic Unit (ALU) is responsible for:

• Managing input and output devices

• Carrying out mathematical and logical operations

• Controlling the sequence of execution

• Storing the results of calculations

The Control Unit (CU) manages the CPU by:

• Executing arithmetic operations directly

• Sending control signals to coordinate components

• Storing instructions permanently

• Increasing the clock speed automatically

In the Fetch–Decode–Execute cycle, which step involves retrieving (taking) the instruction from memory?

• Fetch

• Decode

• Execute

• Store

During the decode stage, the CPU:

• Determines what the instruction means

• Sends the instruction back to memory

• Executes the instruction

• Increments the MAR

Which register temporarily stores the result of an ALU operation?

• PC

• ACC

• MAR

• MDR