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Computer Architecture (GCSE Computing)

The following is a GCSE Computing test covering 'Computer Architecture' from the broader topic 3. Hardware. The test is geared towards the CAMBRIGE-IGCSE exam board style syllabus.
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What is the main purpose of a GPU (graphics processing unit) compared to a CPU?
What does a CPU clock speed of 3.0 GHz mean?
What is the purpose of the memory address register (MAR)?
What is the main function of the arithmetic logic unit (ALU) in a CPU?
What is the role of the Program Counter (PC) in the CPU?
Which of the following describes cache memory?
Which CPU component typically handles floating-point arithmetic separately from the main ALU?
What is the purpose of a CPU cache?
Which CPU component is responsible for decoding the instruction fetched into the instruction register?
Which register contains the current instruction that is being decoded and executed?
What does the term "microarchitecture" most directly describe?