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Daily Practice · GCSE Computer Science

August 2019 - GCSE Computer Science 5-a-day

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

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August 2019

31 sheets · 155 questions · GCSE

August 2019 compilationAll answers

Every sheet in August 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 August 2019Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  2. 2nd August 2019A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  3. 3rd August 2019A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  4. 4th August 2019A streaming company records which shows each user watches and uses this to recommend similar shows. Explain one ethical concern this could raise, even if the company only uses the data to improve recommendations.
  5. 5th August 2019State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  6. 6th August 2019State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  7. 7th August 2019Give one example of an optical secondary storage device.
  8. 8th August 2019Name the four layers of the TCP/IP model in order from the one closest to the user.
  9. 9th August 2019State the term used for realistic data that a program would be expected to handle during normal use.
  10. 10th August 2019Define the term 'primary key' as used in a database table.
  11. 11th August 2019State the difference between lossy and lossless compression.
  12. 12th August 2019State the condition that must be met before a binary search can be used on an array.
  13. 13th August 2019A logic circuit has inputs C and D. C feeds into a NOT gate; the output of the NOT gate and D feed into an OR gate, giving output Y. Write the Boolean expression for Y and state its value when C = 1 and D = 0.
  14. 14th August 2019Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  15. 15th August 2019Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  16. 16th August 2019A 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.
  17. 17th August 2019Convert the denary number 45 to hexadecimal.
  18. 18th August 2019What does the acronym CPU stand for?
  19. 19th August 2019State what the term malware means.
  20. 20th August 2019An array named temps holds 12 values. State the index of the first item and the index of the last item.
  21. 21st August 2019An 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).
  22. 22nd August 2019Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
  23. 23rd August 2019Which piece of UK legislation controls how organisations must store and use people's personal data?
  24. 24th August 2019Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
  25. 25th August 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.
  26. 26th August 2019Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
  27. 27th August 2019State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  28. 28th August 2019A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
  29. 29th August 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;
  30. 30th August 2019State one function carried out by the operating system of a computer.
  31. 31st August 2019In computational thinking, what is meant by the term 'decomposition'?