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Daily Practice · GCSE Computer Science

October 2015 - GCSE Computer Science 5-a-day

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

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October 2015

31 sheets · 155 questions · GCSE

October 2015 compilationAll answers

Every sheet in October 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 October 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.
  2. 2nd October 2015State the layer that IP operates in, and describe its job.
  3. 3rd October 2015Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  4. 4th October 2015A table called members has fields memberId, firstName, lastName and joinYear. Write an SQL statement that adds a new record with memberId 12, firstName 'Priya', lastName 'Shah' and joinYear 2026.
  5. 5th October 2015Define the term 'interrupt' as used to describe a signal received by a CPU.
  6. 6th October 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.
  7. 7th October 2015Evaluate X = NOT A AND B when A = 0 and B = 1.
  8. 8th October 2015Convert the hexadecimal number FF to an 8-bit binary number.
  9. 9th October 2015Give one advantage of a star topology compared with a mesh topology.
  10. 10th October 2015Describe what syntax highlighting is and how it helps a programmer.
  11. 11th October 2015Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  12. 12th October 2015State the three stages of the fetch-decode-execute cycle in the order they occur.
  13. 13th October 2015State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  14. 14th October 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).
  15. 15th October 2015Define the term 'pixel'.
  16. 16th October 2015Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  17. 17th October 2015Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  18. 18th October 2015Evaluate the expression 23 DIV 4.
  19. 19th October 2015State the correct order of the three operations used to read data from a text file.
  20. 20th October 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.
  21. 21st October 2015Explain the role of TCP when a large file is downloaded.
  22. 22nd October 2015A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  23. 23rd October 2015A table called products has fields productId, name, price and stock. Write an SQL statement that changes the price of the product with productId 7 to 15.99.
  24. 24th October 2015A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  25. 25th October 2015An 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.
  26. 26th October 2015Complete: NOT 0 = ?
  27. 27th October 2015Convert the denary number 200 to hexadecimal, showing your working.
  28. 28th October 2015State what LAN stands for.
  29. 29th October 2015Give one advantage and one disadvantage of using a compiler.
  30. 30th October 2015An 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.
  31. 31st October 2015Which CPU register holds the address of the next instruction to be fetched?