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Daily Practice · GCSE Computer Science

August 2009 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in August 2009, with answers. Systems, data representation, networks, algorithms and programming.

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August 2009

31 sheets · 155 questions · GCSE

August 2009 compilationAll answers

Every sheet in August 2009

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 2009Describe what syntax highlighting is and how it helps a programmer.
  2. 2nd August 2009An 8-bit register stores the value 01100000 (denary 96). State the resulting 8-bit binary value after a left shift by 1 place, and state whether an overflow occurs.
  3. 3rd August 2009Which CPU register holds the address of the next instruction to be fetched?
  4. 4th August 2009Distinguish between the network security threats known as phishing and pharming.
  5. 5th August 2009Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
  6. 6th August 2009A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  7. 7th August 2009A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  8. 8th August 2009A 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.
  9. 9th August 2009State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  10. 10th August 2009State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  11. 11th August 2009Give one example of an optical secondary storage device.
  12. 12th August 2009Explain the role of TCP when a large file is downloaded.
  13. 13th August 2009State the term used for realistic data that a program would be expected to handle during normal use.
  14. 14th August 2009Define the term 'primary key' as used in a database table.
  15. 15th August 2009State the difference between lossy and lossless compression.
  16. 16th August 2009State the condition that must be met before a binary search can be used on an array.
  17. 17th August 2009A 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.
  18. 18th August 2009Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  19. 19th August 2009Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  20. 20th August 2009Give one advantage and one disadvantage of using a compiler.
  21. 21st August 2009Convert the denary number 45 to hexadecimal.
  22. 22nd August 2009What does the acronym CPU stand for?
  23. 23rd August 2009State what the term malware means.
  24. 24th August 2009Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  25. 25th August 2009An 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).
  26. 26th August 2009Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
  27. 27th August 2009Which piece of UK legislation controls how organisations must store and use people's personal data?
  28. 28th August 2009Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
  29. 29th August 2009A 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.
  30. 30th August 2009Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
  31. 31st August 2009A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?