CPU Architecture, Performance & Embedded Systems (AQA GCSE Computer Science)

Exam Questions

22 mins8 questions
13 marks

Five components of a CPU are given below. For each row in Table 1, choose the letter A, B, C, D, E that best matches the description.

Letters should not be used more than once.

A. Bus
B. Arithmetic Logic Unit
C. Control Unit
D. Clock
E. Register

Table 1

Description

Letter

Sends a continuous series of electronic pulses

Decodes the current instruction

Completes calculations

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21 mark

Give one reason why a CPU with two cores might perform faster than an equivalent CPU with only one core.

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32 marks

Describe the following two stages of the Fetch-Execute cycle.

  • Fetch stage

  • Decode stage

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13 marks

Describe the role of each of the following components of a CPU:

  • Clock

  • Control unit

  • Register

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22 marks

Explain the role of main memory in the execute stage of the Fetch-Execute cycle.

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36 marks

Three factors that affect the performance of a CPU are:

  • clock speed

  • number of processor cores

  • cache size

Explain how each of these factors affects CPU performance.

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42 marks

Describe two differences between an embedded system and a non-embedded system.

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13 marks

Alicia says:

My computer has a quad-core processor, so it will run twice as fast as a computer with a dual-core processor.

Explain why this statement is not always true.

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