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Praxis Computer Sciences (5652) Practice Test

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Which term describes the central processing unit?
Correct Answer:
CPU
Explanation:
The central processing unit is the brain of a computer, responsible for executing instructions and coordinating the actions of all other components. It runs the fetch-decode-execute cycle, pulling instructions from memory, figuring out what they mean, and performing the necessary calculations or data movements. This role—actually doing the computing work and directing how data moves through the system—is what makes it the central processing unit. RAM, by contrast, holds data and instructions temporarily for quick access but doesn’t execute them. A video card handles graphics processing, and an optical drive reads and writes discs; neither is the primary engine that runs program instructions. So the term that describes the central processing unit is CPU.

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