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Daily Practice · GCSE Computer Science

October 2011 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in October 2011, with answers. Systems, data representation, networks, algorithms and programming.

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October 2011

31 sheets · 155 questions · GCSE

October 2011 compilationAll answers

Every sheet in October 2011

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

  1. 1st October 2011A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  2. 2nd October 2011A 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;
  3. 3rd October 2011A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  4. 4th October 2011An 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.
  5. 5th October 2011Complete: NOT 0 = ?
  6. 6th October 2011Convert the 8-bit binary number 01011010 to denary.
  7. 7th October 2011State what LAN stands for.
  8. 8th October 2011Describe what syntax highlighting is and how it helps a programmer.
  9. 9th October 2011An 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.
  10. 10th October 2011Which CPU register holds the address of the next instruction to be fetched?
  11. 11th October 2011Distinguish between the network security threats known as phishing and pharming.
  12. 12th October 2011Trace 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).
  13. 13th October 2011A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  14. 14th October 2011A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  15. 15th October 2011A 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.
  16. 16th October 2011State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  17. 17th October 2011Write the pseudocode header and body for a function called isAdult that takes one integer parameter called age and returns True if age is 18 or over.
  18. 18th October 2011Give one example of an optical secondary storage device.
  19. 19th October 2011Explain the role of TCP when a large file is downloaded.
  20. 20th October 2011State the term used for realistic data that a program would be expected to handle during normal use.
  21. 21st October 2011State what a foreign key is used for.
  22. 22nd October 2011State the difference between lossy and lossless compression.
  23. 23rd October 2011State the condition that must be met before a binary search can be used on an array.
  24. 24th October 2011A 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.
  25. 25th October 2011A pseudocode algorithm is: count <- 0, x <- 10, WHILE x > 0, count <- count + 1, x <- x - 3, ENDWHILE, OUTPUT count. Complete a trace table for x and count, laid out as x | count, then state the value output.
  26. 26th October 2011Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  27. 27th October 2011Give one advantage and one disadvantage of using a compiler.
  28. 28th October 2011Convert the denary number 45 to hexadecimal.
  29. 29th October 2011What does the acronym CPU stand for?
  30. 30th October 2011State what the term malware means.
  31. 31st October 2011Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.