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Daily Practice · GCSE Computer Science

September 2020 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in September 2020, with answers. Systems, data representation, networks, algorithms and programming.

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September 2020

30 sheets · 150 questions · GCSE

September 2020 compilationAll answers

Every sheet in September 2020

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 2020Two CPUs are compared for a task optimised for multiple cores: CPU A has 2 cores at 4.2 GHz; CPU B has 6 cores at 3.0 GHz. Explain which CPU is likely to perform better for this task.
  2. 2nd September 2020State why an organisation might employ penetration testers to test its network.
  3. 3rd September 2020Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  4. 4th September 2020State one example of a file format that commonly uses lossy compression.
  5. 5th September 2020State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  6. 6th September 2020State whether the source code of proprietary (closed source) software is normally available for the public to view.
  7. 7th September 2020Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  8. 8th September 2020A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
  9. 9th September 2020Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  10. 10th September 2020Name the four layers of the TCP/IP model in order from the one closest to the user.
  11. 11th September 2020Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  12. 12th September 2020A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  13. 13th September 2020Each 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.
  14. 14th September 2020Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  15. 15th September 2020State the two values a Boolean data type can hold.
  16. 16th September 2020Convert the denary number 39 to an 8-bit binary number, showing your working.
  17. 17th September 2020Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  18. 18th September 2020A 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.
  19. 19th September 2020Convert the hexadecimal number 1A to denary.
  20. 20th September 2020Convert the denary number 156 to an 8 bit binary number.
  21. 21st September 2020Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  22. 22nd September 2020An array named temps holds 12 values. State the index of the first item and the index of the last item.
  23. 23rd September 2020An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  24. 24th September 2020A 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.
  25. 25th September 2020Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  26. 26th September 2020Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  27. 27th September 2020Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
  28. 28th September 2020A 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.
  29. 29th September 2020State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  30. 30th September 2020Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.