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Daily Practice · GCSE Computer Science

July 2018 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in July 2018, with answers. Systems, data representation, networks, algorithms and programming.

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July 2018

31 sheets · 155 questions · GCSE

July 2018 compilationAll answers

Every sheet in July 2018

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

  1. 1st July 2018State whether the source code of proprietary (closed source) software is normally available for the public to view.
  2. 2nd July 2018Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  3. 3rd July 2018State the value returned by LENGTH(word) if word stores the string 'Computer'.
  4. 4th July 2018Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  5. 5th July 2018Name the four layers of the TCP/IP model in order from the one closest to the user.
  6. 6th July 2018Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  7. 7th July 2018A table called books has fields bookId, title, authorId and copiesAvailable. Write an SQL statement that selects the title of every book with more than 2 copies available.
  8. 8th July 2018Each pair from the previous question is stored using 2 bytes. Calculate the compression ratio achieved, given the uncompressed row (1 byte per pixel) uses 8 bytes.
  9. 9th July 2018Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  10. 10th July 2018State the two values a Boolean data type can hold.
  11. 11th July 2018State how many different values can be represented using 5 bits, and explain your reasoning.
  12. 12th July 2018Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  13. 13th July 2018A 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.
  14. 14th July 2018Convert the hexadecimal number 1A to denary.
  15. 15th July 2018Convert the denary number 156 to an 8 bit binary number.
  16. 16th July 2018Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  17. 17th July 2018An array named temps holds 12 values. State the index of the first item and the index of the last item.
  18. 18th July 2018An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  19. 19th July 2018A 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.
  20. 20th July 2018Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  21. 21st July 2018Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  22. 22nd July 2018State the key difference between a procedure and a function.
  23. 23rd July 2018A 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.
  24. 24th July 2018State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  25. 25th July 2018Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  26. 26th July 2018Give one advantage of a relational database over a flat-file database.
  27. 27th July 2018Define the term 'interrupt' as used to describe a signal received by a CPU.
  28. 28th July 2018An 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.
  29. 29th July 2018Evaluate X = NOT A AND B when A = 0 and B = 1.
  30. 30th July 2018Convert the hexadecimal number 3F to denary.
  31. 31st July 2018Give one advantage of a star topology compared with a mesh topology.