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Daily Practice · GCSE Computer Science

June 2025 - GCSE Computer Science 5-a-day

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

← Today's GCSE Computer Science sheet

June 2025

30 sheets · 150 questions · GCSE

June 2025 compilationAll answers

Every sheet in June 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 June 2025Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  2. 2nd June 2025Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  3. 3rd June 2025State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  4. 4th June 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.
  5. 5th June 2025Name the four layers of the TCP/IP model in order from the one closest to the user.
  6. 6th June 2025Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  7. 7th June 2025Define the term 'primary key' as used in a database table.
  8. 8th June 2025Define the term 'interrupt' as used to describe a signal received by a CPU.
  9. 9th June 2025An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.
  10. 10th June 2025Evaluate X = NOT A AND B when A = 0 and B = 1.
  11. 11th June 2025Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  12. 12th June 2025Give one advantage of a star topology compared with a mesh topology.
  13. 13th June 2025A program compiles and runs but always outputs an average that is too small. State the type of error and explain why the translator did not report it.
  14. 14th June 2025Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  15. 15th June 2025State the three stages of the fetch-decode-execute cycle in the order they occur.
  16. 16th June 2025State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  17. 17th June 2025An array named temps holds 12 values. State the index of the first item and the index of the last item.
  18. 18th June 2025Define the term 'pixel'.
  19. 19th June 2025Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  20. 20th June 2025Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  21. 21st June 2025Evaluate the expression 23 DIV 4.
  22. 22nd June 2025A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
  23. 23rd June 2025A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.
  24. 24th June 2025State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  25. 25th June 2025A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  26. 26th June 2025A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;
  27. 27th June 2025A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  28. 28th June 2025An array contains [9, 2, 6], to be sorted using insertion sort. Show the state of the array after each new element has been inserted into its correct position.
  29. 29th June 2025Complete: NOT 0 = ?
  30. 30th June 2025Convert the 8-bit binary number 01011010 to denary.