Revision Library
/Subjects/Computer Science/Daily Practice
Daily Practice · GCSE Computer Science

April 2014 - GCSE Computer Science 5-a-day

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

← Today's GCSE Computer Science sheet

April 2014

30 sheets · 150 questions · GCSE

April 2014 compilationAll answers

Every sheet in April 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 April 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;
  2. 2nd April 2014A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  3. 3rd April 2014An 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.
  4. 4th April 2014Complete: NOT 0 = ?
  5. 5th April 2014Convert the 8-bit binary number 01011010 to denary.
  6. 6th April 2014State what LAN stands for.
  7. 7th April 2014Explain why an interpreter is often preferred while a program is being written.
  8. 8th April 2014An 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.
  9. 9th April 2014Which CPU register holds the address of the next instruction to be fetched?
  10. 10th April 2014Distinguish between the network security threats known as phishing and pharming.
  11. 11th April 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.
  12. 12th April 2014A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  13. 13th April 2014A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  14. 14th April 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.
  15. 15th April 2014State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  16. 16th April 2014Write 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.
  17. 17th April 2014Give one example of an optical secondary storage device.
  18. 18th April 2014State the layer that IP operates in, and describe its job.
  19. 19th April 2014State the term used for realistic data that a program would be expected to handle during normal use.
  20. 20th April 2014State what a foreign key is used for.
  21. 21st April 2014State the difference between lossy and lossless compression.
  22. 22nd April 2014State the condition that must be met before a binary search can be used on an array.
  23. 23rd April 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.
  24. 24th April 2014A 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.
  25. 25th April 2014Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  26. 26th April 2014Describe what syntax highlighting is and how it helps a programmer.
  27. 27th April 2014Convert the denary number 45 to hexadecimal.
  28. 28th April 2014What does the acronym CPU stand for?
  29. 29th April 2014State what the term malware means.
  30. 30th April 2014Trace 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).