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Daily Practice · GCSE Computer Science

January 2025 - GCSE Computer Science 5-a-day

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

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January 2025

31 sheets · 155 questions · GCSE

January 2025 compilationAll answers

Every sheet in January 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 January 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.
  2. 2nd January 2025State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  3. 3rd January 2025State the typical maximum capacity of a single-layer DVD.
  4. 4th January 2025Define the term protocol.
  5. 5th January 2025State what is meant by a syntax error.
  6. 6th January 2025Define the term 'primary key' as used in a database table.
  7. 7th January 2025What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
  8. 8th January 2025Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  9. 9th January 2025Given P = 0 and Q = 1, state the value of P OR Q.
  10. 10th January 2025Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  11. 11th January 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.
  12. 12th January 2025Explain the purpose of a breakpoint.
  13. 13th January 2025Convert the 4-bit binary number 1101 to denary.
  14. 14th January 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.
  15. 15th January 2025State why an organisation might employ penetration testers to test its network.
  16. 16th January 2025Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  17. 17th January 2025State one example of a file format that commonly uses lossy compression.
  18. 18th January 2025State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  19. 19th January 2025State whether the source code of proprietary (closed source) software is normally available for the public to view.
  20. 20th January 2025Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  21. 21st January 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.
  22. 22nd January 2025Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  23. 23rd January 2025Name the four layers of the TCP/IP model in order from the one closest to the user.
  24. 24th January 2025Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  25. 25th January 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;
  26. 26th January 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.
  27. 27th January 2025Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  28. 28th January 2025State the two values a Boolean data type can hold.
  29. 29th January 2025Convert the 8-bit binary number 01011010 to denary.
  30. 30th January 2025Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  31. 31st January 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.