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Daily Practice · GCSE Computer Science

January 2026 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in January 2026, with answers. Systems, data representation, networks, algorithms and programming.

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January 2026

31 sheets · 155 questions · GCSE

January 2026 compilationAll answers

Every sheet in January 2026

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

  1. 1st January 2026Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  2. 2nd January 2026A table called books has fields bookId, title, authorId and copiesAvailable. Write an SQL statement that selects the title of every book with more than 2 copies available.
  3. 3rd January 2026Each 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.
  4. 4th January 2026Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  5. 5th January 2026State the two values a Boolean data type can hold.
  6. 6th January 2026State how many different values can be represented using 5 bits, and explain your reasoning.
  7. 7th January 2026Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  8. 8th January 2026Give one advantage and one disadvantage of using a compiler.
  9. 9th January 2026Convert the hexadecimal number 1A to denary.
  10. 10th January 2026Convert the denary number 156 to an 8 bit binary number.
  11. 11th January 2026Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  12. 12th January 2026Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  13. 13th January 2026An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  14. 14th January 2026A 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.
  15. 15th January 2026Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  16. 16th January 2026Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  17. 17th January 2026State the key difference between a procedure and a function.
  18. 18th January 2026A 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.
  19. 19th January 2026A 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?
  20. 20th January 2026Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  21. 21st January 2026Give one advantage of a relational database over a flat-file database.
  22. 22nd January 2026Define the term 'interrupt' as used to describe a signal received by a CPU.
  23. 23rd January 2026An 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.
  24. 24th January 2026Evaluate X = NOT A AND B when A = 0 and B = 1.
  25. 25th January 2026Convert the hexadecimal number 3F to denary.
  26. 26th January 2026Give one advantage of a star topology compared with a mesh topology.
  27. 27th January 2026Name the translator used for assembly language and describe how it differs from a compiler.
  28. 28th January 2026Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  29. 29th January 2026State the three stages of the fetch-decode-execute cycle in the order they occur.
  30. 30th January 2026State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  31. 31st January 2026Explain what happens if a program tries to read index 5 of an array declared with 5 elements.