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Daily Practice · GCSE Computer Science

April 2009 - GCSE Computer Science 5-a-day

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

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April 2009

30 sheets · 150 questions · GCSE

April 2009 compilationAll answers

Every sheet in April 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 April 2009Explain the role of TCP when a large file is downloaded.
  2. 2nd April 2009A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  3. 3rd April 2009A 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;
  4. 4th April 2009A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  5. 5th April 2009An 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.
  6. 6th April 2009Complete: NOT 0 = ?
  7. 7th April 2009Convert the 8-bit binary number 01011010 to denary.
  8. 8th April 2009State what LAN stands for.
  9. 9th April 2009Give one advantage and one disadvantage of using a compiler.
  10. 10th April 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.
  11. 11th April 2009Which CPU register holds the address of the next instruction to be fetched?
  12. 12th April 2009Distinguish between the network security threats known as phishing and pharming.
  13. 13th April 2009Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  14. 14th April 2009A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  15. 15th April 2009A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  16. 16th April 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.
  17. 17th April 2009State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  18. 18th April 2009Write 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.
  19. 19th April 2009Give one example of an optical secondary storage device.
  20. 20th April 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?
  21. 21st April 2009State the term used for realistic data that a program would be expected to handle during normal use.
  22. 22nd April 2009State what a foreign key is used for.
  23. 23rd April 2009State the difference between lossy and lossless compression.
  24. 24th April 2009State the condition that must be met before a binary search can be used on an array.
  25. 25th April 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.
  26. 26th April 2009A 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.
  27. 27th April 2009Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  28. 28th April 2009Name the translator used for assembly language and describe how it differs from a compiler.
  29. 29th April 2009Convert the denary number 45 to hexadecimal.
  30. 30th April 2009What does the acronym CPU stand for?