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Daily Practice · GCSE Computer Science

July 2021 - GCSE Computer Science 5-a-day

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

← Today's GCSE Computer Science sheet

July 2021

31 sheets · 155 questions · GCSE

July 2021 compilationAll answers

Every sheet in July 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 July 2021Convert the denary number 45 to hexadecimal.
  2. 2nd July 2021What does the acronym CPU stand for?
  3. 3rd July 2021State what the term malware means.
  4. 4th July 2021Describe what a nested loop does when it processes a 2D array.
  5. 5th July 2021An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
  6. 6th July 2021Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
  7. 7th July 2021Which piece of UK legislation controls how organisations must store and use people's personal data?
  8. 8th July 2021Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
  9. 9th July 2021A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
  10. 10th July 2021Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
  11. 11th July 2021Give two reasons why network communication is divided into layers.
  12. 12th July 2021A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
  13. 13th July 2021A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  14. 14th July 2021State one function carried out by the operating system of a computer.
  15. 15th July 2021In computational thinking, what is meant by the term 'decomposition'?
  16. 16th July 2021Given A = 1 and B = 1, state the value of A AND B.
  17. 17th July 2021Convert the denary number 39 to an 8-bit binary number, showing your working.
  18. 18th July 2021Define a peer-to-peer network.
  19. 19th July 2021Explain why an interpreter is often preferred while a program is being written.
  20. 20th July 2021Convert the denary number 5 to a 4-bit binary number.
  21. 21st July 2021A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
  22. 22nd July 2021A 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.
  23. 23rd July 2021A 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.
  24. 24th July 2021A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
  25. 25th July 2021State the type of program that is typically stored in ROM.
  26. 26th July 2021State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
  27. 27th July 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.
  28. 28th July 2021Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
  29. 29th July 2021State the typical maximum capacity of a single-layer DVD.
  30. 30th July 2021State the layer that IP operates in, and describe its job.
  31. 31st July 2021State what is meant by a syntax error.