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Daily Practice · GCSE Computer Science

June 2015 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in June 2015, with answers. Systems, data representation, networks, algorithms and programming.

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June 2015

30 sheets · 150 questions · GCSE

June 2015 compilationAll answers

Every sheet in June 2015

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

  1. 1st June 2015Convert the denary number 156 to an 8 bit binary number.
  2. 2nd June 2015Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  3. 3rd June 2015Trace 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).
  4. 4th June 2015An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  5. 5th June 2015A 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.
  6. 6th June 2015Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  7. 7th June 2015Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  8. 8th June 2015State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  9. 9th June 2015A 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.
  10. 10th June 2015Explain the role of TCP when a large file is downloaded.
  11. 11th June 2015Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  12. 12th June 2015Define the term 'primary key' as used in a database table.
  13. 13th June 2015Define the term 'interrupt' as used to describe a signal received by a CPU.
  14. 14th June 2015An 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.
  15. 15th June 2015Evaluate X = NOT A AND B when A = 0 and B = 1.
  16. 16th June 2015Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  17. 17th June 2015Give one advantage of a star topology compared with a mesh topology.
  18. 18th June 2015Give one advantage and one disadvantage of using a compiler.
  19. 19th June 2015Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  20. 20th June 2015State the three stages of the fetch-decode-execute cycle in the order they occur.
  21. 21st June 2015State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  22. 22nd June 2015Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  23. 23rd June 2015Define the term 'pixel'.
  24. 24th June 2015Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  25. 25th June 2015Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  26. 26th June 2015Evaluate the expression 23 DIV 4.
  27. 27th June 2015A 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.
  28. 28th June 2015A 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.
  29. 29th June 2015A 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?
  30. 30th June 2015A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?