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Daily Practice · GCSE Computer Science

October 2019 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in October 2019, with answers. Systems, data representation, networks, algorithms and programming.

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October 2019

31 sheets · 155 questions · GCSE

October 2019 compilationAll answers

Every sheet in October 2019

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 2019Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  2. 2nd October 2019State the value returned by LENGTH(word) if word stores the string 'Computer'.
  3. 3rd October 2019Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  4. 4th October 2019State the layer that IP operates in, and describe its job.
  5. 5th October 2019Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  6. 6th October 2019A 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.
  7. 7th October 2019Each 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.
  8. 8th October 2019Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  9. 9th October 2019State the two values a Boolean data type can hold.
  10. 10th October 2019State how many different values can be represented using 5 bits, and explain your reasoning.
  11. 11th October 2019Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  12. 12th October 2019Describe what syntax highlighting is and how it helps a programmer.
  13. 13th October 2019Convert the hexadecimal number 1A to denary.
  14. 14th October 2019Convert the denary number 156 to an 8 bit binary number.
  15. 15th October 2019Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  16. 16th October 2019Trace 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).
  17. 17th October 2019An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  18. 18th October 2019A 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.
  19. 19th October 2019Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  20. 20th October 2019Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  21. 21st October 2019State the key difference between a procedure and a function.
  22. 22nd October 2019A 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.
  23. 23rd October 2019Explain the role of TCP when a large file is downloaded.
  24. 24th October 2019Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  25. 25th October 2019Give one advantage of a relational database over a flat-file database.
  26. 26th October 2019Define the term 'interrupt' as used to describe a signal received by a CPU.
  27. 27th October 2019An 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.
  28. 28th October 2019Evaluate X = NOT A AND B when A = 0 and B = 1.
  29. 29th October 2019Convert the hexadecimal number 3F to denary.
  30. 30th October 2019Give one advantage of a star topology compared with a mesh topology.
  31. 31st October 2019Give one advantage and one disadvantage of using a compiler.