A Level Computer Science OCR Practice Exam

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What is the purpose of the arithmetic logic unit (ALU) within the CPU?

To manage memory address locations
To execute input/output commands
To perform arithmetic and logical operations
To handle network communications

The correct answer is: To perform arithmetic and logical operations

The arithmetic logic unit (ALU) is a crucial component of the CPU that specifically handles the execution of arithmetic and logical operations. This includes basic mathematical operations such as addition, subtraction, multiplication, and division, as well as logical operations like AND, OR, NOT, and comparisons such as greater than or less than. By performing these operations, the ALU enables the CPU to process data and execute instructions effectively, making it an essential function for any computation. In contrast, managing memory address locations is typically the responsibility of other components, particularly the memory management unit (MMU). Executing input/output commands involves different subsystems connected to the CPU, often managed through specific I/O controllers. Additionally, handling network communications is typically done by other dedicated hardware designed for networking purposes, which operates independently or alongside the CPU. Therefore, the primary role of the ALU is focused on arithmetic and logical processing, making it the correct answer.