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Daily Practice · GCSE Computer Science

June 2019 - GCSE Computer Science 5-a-day

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

← Today's GCSE Computer Science sheet

June 2019

30 sheets · 150 questions · GCSE

June 2019 compilationAll answers

Every sheet in June 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 June 2019Describe what syntax highlighting is and how it helps a programmer.
  2. 2nd June 2019Convert the 4-bit binary number 1101 to denary.
  3. 3rd June 2019Two 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.
  4. 4th June 2019State why an organisation might employ penetration testers to test its network.
  5. 5th June 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).
  6. 6th June 2019State one example of a file format that commonly uses lossy compression.
  7. 7th June 2019State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  8. 8th June 2019State whether the source code of proprietary (closed source) software is normally available for the public to view.
  9. 9th June 2019Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  10. 10th June 2019A 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.
  11. 11th June 2019Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  12. 12th June 2019Explain the role of TCP when a large file is downloaded.
  13. 13th June 2019Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  14. 14th June 2019A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  15. 15th June 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.
  16. 16th June 2019Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  17. 17th June 2019State the two values a Boolean data type can hold.
  18. 18th June 2019Convert the denary number 39 to an 8-bit binary number, showing your working.
  19. 19th June 2019Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  20. 20th June 2019Give one advantage and one disadvantage of using a compiler.
  21. 21st June 2019Convert the hexadecimal number 1A to denary.
  22. 22nd June 2019Convert the denary number 156 to an 8 bit binary number.
  23. 23rd June 2019Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  24. 24th June 2019Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  25. 25th June 2019An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  26. 26th June 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.
  27. 27th June 2019Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  28. 28th June 2019Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  29. 29th June 2019Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
  30. 30th June 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.