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Daily Practice · GCSE Computer Science

March 2019 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in March 2019, with answers. Systems, data representation, networks, algorithms and programming.

← Today's GCSE Computer Science sheet

March 2019

31 sheets · 155 questions · GCSE

March 2019 compilationAll answers

Every sheet in March 2019

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

  1. 1st March 2019Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  2. 2nd March 2019Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
  3. 3rd March 2019An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  4. 4th March 2019A 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.
  5. 5th March 2019Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  6. 6th March 2019Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  7. 7th March 2019State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  8. 8th March 2019A 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.
  9. 9th March 2019Define the term protocol.
  10. 10th March 2019Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  11. 11th March 2019Define the term 'primary key' as used in a database table.
  12. 12th March 2019Define the term 'interrupt' as used to describe a signal received by a CPU.
  13. 13th March 2019An 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.
  14. 14th March 2019Evaluate X = NOT A AND B when A = 0 and B = 1.
  15. 15th March 2019Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  16. 16th March 2019Give one advantage of a star topology compared with a mesh topology.
  17. 17th March 2019Explain the purpose of a breakpoint.
  18. 18th March 2019Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  19. 19th March 2019State the three stages of the fetch-decode-execute cycle in the order they occur.
  20. 20th March 2019State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  21. 21st March 2019Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  22. 22nd March 2019Define the term 'pixel'.
  23. 23rd March 2019Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  24. 24th March 2019Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  25. 25th March 2019Evaluate the expression 23 DIV 4.
  26. 26th March 2019A 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.
  27. 27th March 2019A 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.
  28. 28th March 2019Name the four layers of the TCP/IP model in order from the one closest to the user.
  29. 29th March 2019A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  30. 30th March 2019A 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;
  31. 31st March 2019A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).