A Level Computer Science OCR Practice Exam

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Prepare for the A Level Computer Science OCR Exam with engaging quizzes, detailed explanations, and effective study tips. Maximize your readiness and boost your confidence for exam day!

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What constitutes the Central Processing Unit (CPU) of a computer?

The RAM and external storage
The registers, ALU, and control unit
The graphics processing unit and sound card
The motherboard and power supply

The correct answer is: The registers, ALU, and control unit

The correct answer highlights that the Central Processing Unit (CPU) comprises the registers, Arithmetic Logic Unit (ALU), and control unit. The registers are small, fast storage locations within the CPU that temporarily hold data and instructions that the CPU is currently processing. This allows for rapid access and manipulation of data during computation. The ALU is a critical component responsible for performing arithmetic and logical operations, enabling the CPU to execute mathematical calculations and make decisions based on logical conditions. The control unit coordinates the activities of the CPU and manages the flow of data within the system by directing the operation of the processor and communicating with other components. Understanding these components is essential, as they work together to ensure the CPU functions effectively, allowing it to process instructions and execute programs efficiently.