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Daily Practice · GCSE Computer Science

April 2021 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in April 2021, with answers. Systems, data representation, networks, algorithms and programming.

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April 2021

30 sheets · 150 questions · GCSE

April 2021 compilationAll answers

Every sheet in April 2021

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

  1. 1st April 2021A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
  2. 2nd April 2021State the type of program that is typically stored in ROM.
  3. 3rd April 2021State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
  4. 4th April 2021A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
  5. 5th April 2021State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  6. 6th April 2021State the typical maximum capacity of a single-layer DVD.
  7. 7th April 2021Explain the role of TCP when a large file is downloaded.
  8. 8th April 2021State what is meant by a syntax error.
  9. 9th April 2021Define the term 'primary key' as used in a database table.
  10. 10th April 2021What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
  11. 11th April 2021Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  12. 12th April 2021Given P = 0 and Q = 1, state the value of P OR Q.
  13. 13th April 2021Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  14. 14th April 2021A 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.
  15. 15th April 2021Give one advantage and one disadvantage of using a compiler.
  16. 16th April 2021Convert the 4-bit binary number 1101 to denary.
  17. 17th April 2021Two 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.
  18. 18th April 2021State why an organisation might employ penetration testers to test its network.
  19. 19th April 2021Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  20. 20th April 2021State one example of a file format that commonly uses lossy compression.
  21. 21st April 2021State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  22. 22nd April 2021State whether the source code of proprietary (closed source) software is normally available for the public to view.
  23. 23rd April 2021Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  24. 24th April 2021A 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.
  25. 25th April 2021Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  26. 26th April 2021A 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?
  27. 27th April 2021Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  28. 28th April 2021A 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;
  29. 29th April 2021Each 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.
  30. 30th April 2021Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?