Question

Which of the following operations is NOT typically performed by the Arithmetic Logic Unit?

• A. Logical AND, OR and NOT
• B. Comparison of values
• C. Addition and Subtraction
• D. Data transfer between RAM and storage

Hint:

ALU performs:
• Arithmetic operations
• Logical operations
• Comparisons Memory transfers are controlled by the Control Unit and I/O systems, not by the ALU.

Answer 1

The Correct Option is D

Step 1: Understand the arithmetic functions of ALU.
The term Arithmetic refers to mathematical calculations. Examples include: \[ \text{Addition},\quad \text{Subtraction},\quad \text{Multiplication},\quad \text{Division} \] Therefore, addition and subtraction are performed by the ALU.

Step 2: Understand the logical functions of ALU.
The ALU also performs logical operations used in decision-making. Examples include: \[ \text{AND},\quad \text{OR},\quad \text{NOT},\quad \text{XOR} \] Hence logical AND, OR and NOT are ALU functions.

Step 3: Understand comparison operations.
The ALU compares values to determine whether: \[ A>B,\quad A<B,\quad A=B \] Such comparisons are essential in programming and processor execution. Thus comparison operations are also performed by the ALU.

Step 4: Analyze data transfer operations.
Transferring data between RAM and storage devices is handled by:
• Memory Controller
• Input/Output System
• Control Unit The ALU does not directly perform data transfer operations. \[ {\text{Data transfer between RAM and storage}} \] Hence, option (D) is correct.