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Olympiad (Class 5) Computer Science — practice by topic

Browse 202 questions across 4 Computer Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Computer Science topics

Internet (63)Computer fundamentals and storage devices (54)MS Word, MS PowerPoint and Windows 11 (45)Computer Memory (40)

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Which part of a computer reads and decodes the instructions of a program?Read the answer and worked solution →Riya's computer must add 4875 and 1290 quickly. Which unit does the sum?Read the answer and worked solution →The control unit, ALU and registers together form which main part of a computer?Read the answer and worked solution →A device that gives results to the user in a form people can see or hear is called an what?Read the answer and worked solution →

Worked practice questions

Which part of a computer reads and decodes the instructions of a program?

  1. Expansion card
  2. Speaker box
  3. Power supply
  4. Control unit
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Correct answer: D. Control unit

The control unit reads each instruction and turns it into signals that activate other parts.

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Riya's computer must add 4875 and 1290 quickly. Which unit does the sum?

  1. Web browser app
  2. Printer ink unit
  3. Motherboard case
  4. Arithmetic logic unit
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Correct answer: D. Arithmetic logic unit

The arithmetic logic unit carries out arithmetic operations such as addition and subtraction.

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The control unit, ALU and registers together form which main part of a computer?

  1. Optical disc drive
  2. Monitor display
  3. Hard disk drive
  4. CPU, the processor
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Correct answer: D. CPU, the processor

Together the control unit, ALU and registers make up the central processing unit, or CPU.

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