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Daily Practice · GCSE Computer Science

April 1954 5-a-day

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April 1954

30 sheets · 150 questions · GCSE

April 1954 compilationAll answers

Every sheet in April 1954

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 1954An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  2. 2nd April 1954A CPU's cache has a hit rate of 80%. During a task the CPU makes 4000 requests for data. Calculate the number of cache hits and cache misses.
  3. 3rd April 1954Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  4. 4th April 1954Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  5. 5th April 1954State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  6. 6th April 1954A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
  7. 7th April 1954Explain the role of TCP when a large file is downloaded.
  8. 8th April 1954Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  9. 9th April 1954Define the term 'primary key' as used in a database table.
  10. 10th April 1954Define the term 'interrupt' as used to describe a signal received by a CPU.
  11. 11th April 1954An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.
  12. 12th April 1954Evaluate X = NOT A AND B when A = 0 and B = 1.
  13. 13th April 1954Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  14. 14th April 1954Give one advantage of a star topology compared with a mesh topology.
  15. 15th April 1954Give one advantage and one disadvantage of using a compiler.
  16. 16th April 1954Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  17. 17th April 1954State the three stages of the fetch-decode-execute cycle in the order they occur.
  18. 18th April 1954State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  19. 19th April 1954Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  20. 20th April 1954Define the term 'pixel'.
  21. 21st April 1954Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  22. 22nd April 1954Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  23. 23rd April 1954Evaluate the expression 23 DIV 4.
  24. 24th April 1954A 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.
  25. 25th April 1954A 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.
  26. 26th April 1954A 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?
  27. 27th April 1954A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  28. 28th April 1954A 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;
  29. 29th April 1954A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  30. 30th April 1954An 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.