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Daily Practice · GCSE Computer Science

December 2025 - GCSE Computer Science 5-a-day

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

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December 2025

31 sheets · 155 questions · GCSE

December 2025 compilationAll answers

Every sheet in December 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 December 2025Explain why an interpreter is often preferred while a program is being written.
  2. 2nd December 2025Convert the denary number 5 to a 4-bit binary number.
  3. 3rd December 2025A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
  4. 4th December 2025A simple cipher shifts every letter 2 places forward in the alphabet, wrapping around so Y becomes A and Z becomes B. Encrypt the plaintext CAT using this cipher.
  5. 5th December 2025A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
  6. 6th December 2025A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
  7. 7th December 2025State the type of program that is typically stored in ROM.
  8. 8th December 2025State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
  9. 9th December 2025A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
  10. 10th December 2025Write the pseudocode header and body for a function called isAdult that takes one integer parameter called age and returns True if age is 18 or over.
  11. 11th December 2025State the typical maximum capacity of a single-layer DVD.
  12. 12th December 2025State the layer that IP operates in, and describe its job.
  13. 13th December 2025State what is meant by a syntax error.
  14. 14th December 2025State what a foreign key is used for.
  15. 15th December 2025What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
  16. 16th December 2025Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  17. 17th December 2025Given P = 0 and Q = 1, state the value of P OR Q.
  18. 18th December 2025A pseudocode algorithm is: count <- 0, x <- 10, WHILE x > 0, count <- count + 1, x <- x - 3, ENDWHILE, OUTPUT count. Complete a trace table for x and count, laid out as x | count, then state the value output.
  19. 19th December 2025A network administrator is connecting 10 computers in a server room. Calculate the number of cables needed for a full mesh topology, and state the number needed for a star topology with one central switch.
  20. 20th December 2025Describe what syntax highlighting is and how it helps a programmer.
  21. 21st December 2025Convert the 4-bit binary number 1101 to denary.
  22. 22nd December 2025Two CPUs are compared for a task optimised for multiple cores: CPU A has 2 cores at 4.2 GHz; CPU B has 6 cores at 3.0 GHz. Explain which CPU is likely to perform better for this task.
  23. 23rd December 2025State why an organisation might employ penetration testers to test its network.
  24. 24th December 2025Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
  25. 25th December 2025State one example of a file format that commonly uses lossy compression.
  26. 26th December 2025State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  27. 27th December 2025State whether the source code of proprietary (closed source) software is normally available for the public to view.
  28. 28th December 2025Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  29. 29th December 2025State the value returned by LENGTH(word) if word stores the string 'Computer'.
  30. 30th December 2025Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  31. 31st December 2025Explain the role of TCP when a large file is downloaded.