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Daily Practice · GCSE Computer Science

September 2025 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in September 2025, with answers. Systems, data representation, networks, algorithms and programming.

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September 2025

30 sheets · 150 questions · GCSE

September 2025 compilationAll answers

Every sheet in September 2025

The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.

  1. 1st September 2025Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  2. 2nd September 2025State one example of a file format that commonly uses lossy compression.
  3. 3rd September 2025State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  4. 4th September 2025State whether the source code of proprietary (closed source) software is normally available for the public to view.
  5. 5th September 2025Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  6. 6th September 2025A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
  7. 7th September 2025Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  8. 8th September 2025A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?
  9. 9th September 2025Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  10. 10th September 2025A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  11. 11th September 2025Each pair from the previous question is stored using 2 bytes. Calculate the compression ratio achieved, given the uncompressed row (1 byte per pixel) uses 8 bytes.
  12. 12th September 2025Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  13. 13th September 2025State the two values a Boolean data type can hold.
  14. 14th September 2025Convert the denary number 39 to an 8-bit binary number, showing your working.
  15. 15th September 2025Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  16. 16th September 2025Name the translator used for assembly language and describe how it differs from a compiler.
  17. 17th September 2025Convert the hexadecimal number 1A to denary.
  18. 18th September 2025Convert the denary number 156 to an 8 bit binary number.
  19. 19th September 2025Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  20. 20th September 2025Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
  21. 21st September 2025An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  22. 22nd September 2025A CPU's cache has a hit rate of 80%. During a task the CPU makes 4000 requests for data. Calculate the number of cache hits and cache misses.
  23. 23rd September 2025Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  24. 24th September 2025Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  25. 25th September 2025Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
  26. 26th September 2025A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
  27. 27th September 2025Define the term protocol.
  28. 28th September 2025Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  29. 29th September 2025A table called members has fields memberId, firstName, lastName and joinYear. Write an SQL statement that adds a new record with memberId 12, firstName 'Priya', lastName 'Shah' and joinYear 2026.
  30. 30th September 2025Define the term 'interrupt' as used to describe a signal received by a CPU.