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Daily Practice · GCSE Computer Science

September 2016 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in September 2016, with answers. Systems, data representation, networks, algorithms and programming.

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September 2016

30 sheets · 150 questions · GCSE

September 2016 compilationAll answers

Every sheet in September 2016

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

  1. 1st September 2016Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  2. 2nd September 2016An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  3. 3rd September 2016A 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.
  4. 4th September 2016Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  5. 5th September 2016Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  6. 6th September 2016State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  7. 7th September 2016A 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.
  8. 8th September 2016Name the four layers of the TCP/IP model in order from the one closest to the user.
  9. 9th September 2016Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  10. 10th September 2016Define the term 'primary key' as used in a database table.
  11. 11th September 2016Define the term 'interrupt' as used to describe a signal received by a CPU.
  12. 12th September 2016An 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.
  13. 13th September 2016Evaluate X = NOT A AND B when A = 0 and B = 1.
  14. 14th September 2016Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  15. 15th September 2016Give one advantage of a star topology compared with a mesh topology.
  16. 16th September 2016A 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.
  17. 17th September 2016Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  18. 18th September 2016State the three stages of the fetch-decode-execute cycle in the order they occur.
  19. 19th September 2016State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  20. 20th September 2016An array named temps holds 12 values. State the index of the first item and the index of the last item.
  21. 21st September 2016Define the term 'pixel'.
  22. 22nd September 2016Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  23. 23rd September 2016Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  24. 24th September 2016Evaluate the expression 23 DIV 4.
  25. 25th September 2016A 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.
  26. 26th September 2016A 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.
  27. 27th September 2016State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  28. 28th September 2016A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  29. 29th September 2016A 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;
  30. 30th September 2016A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).