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Daily Practice · GCSE Computer Science

April 2004 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in April 2004, with answers. Systems, data representation, networks, algorithms and programming.

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April 2004

30 sheets · 150 questions · GCSE

April 2004 compilationAll answers

Every sheet in April 2004

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 2004A 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.
  2. 2nd April 2004A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.
  3. 3rd April 2004Define the term protocol.
  4. 4th April 2004A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  5. 5th April 2004A 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;
  6. 6th April 2004A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  7. 7th April 2004An 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.
  8. 8th April 2004Complete: NOT 0 = ?
  9. 9th April 2004Convert the 8-bit binary number 01011010 to denary.
  10. 10th April 2004State what LAN stands for.
  11. 11th April 2004Explain the purpose of a breakpoint.
  12. 12th April 2004An 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.
  13. 13th April 2004Which CPU register holds the address of the next instruction to be fetched?
  14. 14th April 2004Distinguish between the network security threats known as phishing and pharming.
  15. 15th April 2004Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  16. 16th April 2004A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  17. 17th April 2004A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  18. 18th April 2004A 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.
  19. 19th April 2004State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  20. 20th April 2004Write 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.
  21. 21st April 2004Give one example of an optical secondary storage device.
  22. 22nd April 2004Name the four layers of the TCP/IP model in order from the one closest to the user.
  23. 23rd April 2004State the term used for realistic data that a program would be expected to handle during normal use.
  24. 24th April 2004State what a foreign key is used for.
  25. 25th April 2004State the difference between lossy and lossless compression.
  26. 26th April 2004State the condition that must be met before a binary search can be used on an array.
  27. 27th April 2004A 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.
  28. 28th April 2004A 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.
  29. 29th April 2004Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  30. 30th April 2004A program compiles and runs but always outputs an average that is too small. State the type of error and explain why the translator did not report it.