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Daily Practice · GCSE Computer Science

August 2014 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in August 2014, with answers. Systems, data representation, networks, algorithms and programming.

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August 2014

31 sheets · 155 questions · GCSE

August 2014 compilationAll answers

Every sheet in August 2014

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 2014Which CPU register holds the address of the next instruction to be fetched?
  2. 2nd August 2014Distinguish between the network security threats known as phishing and pharming.
  3. 3rd August 2014Describe what a nested loop does when it processes a 2D array.
  4. 4th August 2014A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  5. 5th August 2014A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  6. 6th August 2014A 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.
  7. 7th August 2014State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  8. 8th August 2014State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  9. 9th August 2014Give one example of an optical secondary storage device.
  10. 10th August 2014Give two reasons why network communication is divided into layers.
  11. 11th August 2014State the term used for realistic data that a program would be expected to handle during normal use.
  12. 12th August 2014Define the term 'primary key' as used in a database table.
  13. 13th August 2014State the difference between lossy and lossless compression.
  14. 14th August 2014State the condition that must be met before a binary search can be used on an array.
  15. 15th August 2014A 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.
  16. 16th August 2014Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  17. 17th August 2014Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  18. 18th August 2014Explain why an interpreter is often preferred while a program is being written.
  19. 19th August 2014Convert the denary number 45 to hexadecimal.
  20. 20th August 2014What does the acronym CPU stand for?
  21. 21st August 2014State what the term malware means.
  22. 22nd August 2014A 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.
  23. 23rd August 2014An 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).
  24. 24th August 2014Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
  25. 25th August 2014Which piece of UK legislation controls how organisations must store and use people's personal data?
  26. 26th August 2014Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
  27. 27th August 2014A 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.
  28. 28th August 2014Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
  29. 29th August 2014State the layer that IP operates in, and describe its job.
  30. 30th August 2014A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
  31. 31st August 2014A 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;