1. Name the components of CPU

 Ans. a) ALU  b) PC  c) Accumulator  d) MAR  e) IR  f) ID  g) MDR

2. What is the use of registers in CPU?

 Ans. It is used to store intermediate data and instructions.

 3. What is the function of MAR?

 Ans. It specifies the address of memory location from which data or instruction is to be accessed
 or to which the data is to be stored.

4. What is the function of MDR / MBR?

Ans. It contains the data to be written into or read from memory location addressed by MAR.

5. What is program counter?

Ans. It keeps track of the memory address of the instruction that is to be executed next.

6. What is the function of IR?

Ans. It contains the instruction that is being executed.

7. What is the purpose of Instruction Decoder?

Ans. It decodes the instructions.

8. What is a data bus?

Ans. It carries a word to or from memory.


9. What is an address bus?

Ans. It carries memory address. The width of address bus equals the number of bits in the
 MAR.

10. What is the function of control bus?

Ans. It carries signals between the units of the computer.