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Daily Practice · GCSE Computer Science

June 2020 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in June 2020, with answers. Systems, data representation, networks, algorithms and programming.

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June 2020

30 sheets · 150 questions · GCSE

June 2020 compilationAll answers

Every sheet in June 2020

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

  1. 1st June 2020An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  2. 2nd June 2020A 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.
  3. 3rd June 2020Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  4. 4th June 2020Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  5. 5th June 2020State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  6. 6th June 2020A 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.
  7. 7th June 2020Give two reasons why network communication is divided into layers.
  8. 8th June 2020Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  9. 9th June 2020Define the term 'primary key' as used in a database table.
  10. 10th June 2020Define the term 'interrupt' as used to describe a signal received by a CPU.
  11. 11th June 2020An 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.
  12. 12th June 2020Evaluate X = NOT A AND B when A = 0 and B = 1.
  13. 13th June 2020Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  14. 14th June 2020Give one advantage of a star topology compared with a mesh topology.
  15. 15th June 2020Explain why an interpreter is often preferred while a program is being written.
  16. 16th June 2020Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  17. 17th June 2020State the three stages of the fetch-decode-execute cycle in the order they occur.
  18. 18th June 2020State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  19. 19th June 2020A 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.
  20. 20th June 2020Define the term 'pixel'.
  21. 21st June 2020Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  22. 22nd June 2020Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  23. 23rd June 2020Evaluate the expression 23 DIV 4.
  24. 24th June 2020A 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 June 2020A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.
  26. 26th June 2020State the layer that IP operates in, and describe its job.
  27. 27th June 2020A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  28. 28th June 2020A 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 June 2020A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  30. 30th June 2020An array contains [9, 2, 6], to be sorted using insertion sort. Show the state of the array after each new element has been inserted into its correct position.