Free Eduqas GCSE Computer Science (C500) Exam Questions and Answers
Eduqas GCSE Computer Science (C500) is Eduqas's GCSE Computer Science qualification, specification C500, taken in England. The questions here come from Eduqas's published question papers from June 2018 to June 2025, plus its specimen papers, with answers and marking guidance taken from Eduqas's own mark schemes. Written-answer questions let you work out your answer and then reveal what the mark scheme accepts; diagrams, graphs and source material appear with the questions that use them.
If you searched for Eduqas GCSE Computer Science (C500) dumps, an ExamTopics discussion or a free PDF, this is the question bank for it: practice questions with verified answers and explanations, a timed practice test and updates whenever Eduqas changes the exam.
Last updated: October 10, 2026
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Question #1
Sound and graphics can be stored by computer systems. Tick (✓) the boxes below to show whether the statements about sound sampling are TRUE or FALSE. Natural sound is in digital form. This is sampled and converted into analogue form to be stored by computer systems.
Correct answer: B
Explanation
One mark. The statement is false (natural sound is analogue, and is sampled into digital form).
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Question #2
Sound and graphics can be stored by computer systems. Tick (✓) the boxes below to show whether the statements about sound sampling are TRUE or FALSE. A sound sample rate of 16 KHz means the wave is sampled 160,000 times a second.
Correct answer: B
Explanation
One mark. 16 KHz means 16,000 samples per second, not 160,000.
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Question #3
Sound and graphics can be stored by computer systems. Tick (✓) the boxes below to show whether the statements about sound sampling are TRUE or FALSE. The lower the sampling rate, the better the quality of the sound file.
Correct answer: B
Explanation
One mark. A lower sampling rate gives poorer quality.
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Question #4
State what is meant by metadata and give an example of metadata stored in graphics files.
Type your answer, then reveal.
Correct answer: Metadata is a set of data that describes and gives information about other data (additional information about the file). Examples: date created, location, size, dimensions.
Explanation
One mark for the definition (additional information about the file is accepted). One mark for a valid example such as date created/year, location where taken, original size or dimensions. Any other reasonable example is accepted.
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Question #5
Kevin has compressed a sound file to reduce its size using lossy compression. He then converted the resulting file to a lossless file format to improve its quality. Explain the disadvantages of this process.
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Correct answer: Converting to lossy discards some data so quality is lost. Converting to lossless does not recover the lost data, so quality is not improved. The resulting file is larger than the lossy compressed file.
Explanation
One mark each for: lossy conversion discards data/loses quality; lossless conversion cannot recover the data lost in lossy compression; the resulting file is larger than the lossy file.
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Question #6
A simple bitmap graphic has the following characteristics: • 8-bit colour depth • 10 × 300 pixels. Calculate the file size of this graphic in kilobytes. Show your workings.
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Correct answer: 10 × 300 = 3,000 bytes = 3 KB
Explanation
One mark for 10 × 300. One mark for 3,000 bytes (8-bit = 1 byte per pixel). One mark for the answer 3 KB. 2.9 KB (dividing by 1024) is accepted but not expected.
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Question #7
The computer systems used at a warehouse have a single-core Central Processing Unit (CPU) and a typical Von Neumann architecture. Describe the role of the following components. Control Unit
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Correct answer: Control Unit: directs the flow of instructions and/or data; coordinates the other parts of the CPU; generates clock ticks or controls the clock.
Explanation
One mark for each point, up to a maximum of 2 marks.
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Question #8
The computer systems used at a warehouse have a single-core Central Processing Unit (CPU) and a typical Von Neumann architecture. Describe the role of the following components. Arithmetic Logic Unit
Type your answer, then reveal.
Correct answer: The ALU performs all the mathematical calculations / logical operations in the CPU.
Explanation
One mark for calculations/logical operations performed by the ALU.
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Question #9
The computer systems used at a warehouse have a single-core Central Processing Unit (CPU) and a typical Von Neumann architecture. Describe the role of the following components. Describe RISC type processors.
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Correct answer: RISC is Reduced Instruction Set Computer. It processes a limited number of relatively simple instructions; complex commands are broken into longer lists of simpler instructions. RISC processors run cooler, use less power and are cheaper to run.
Explanation
One mark for each point, up to a maximum of 2: Reduced Instruction Set Computer; limited number of instructions; simple instructions; complex commands broken into longer lists of simpler ones; runs cooler/uses less power/cheaper to run.
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Question #10
The computer systems used at a warehouse have a single-core Central Processing Unit (CPU) and a typical Von Neumann architecture. Describe the role of the following components. Explain how main memory is used during the fetch-decode-execute cycle.
Type your answer, then reveal.
Correct answer: Program instructions for current programs are held in main memory (RAM). The next instruction is fetched from main memory to the processor to be decoded and executed. Resultant data may be written back to main memory.
Explanation
One mark each, maximum 3: instructions are in main memory/RAM; next instruction is fetched from RAM to be decoded and executed; resultant data may be written to RAM. Accepted but not expected: use of registers; data used by the instruction may be stored in/fetched from RAM.
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