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Daily Practice · GCSE Computer Science

March 2018 - GCSE Computer Science 5-a-day

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

← Today's GCSE Computer Science sheet

March 2018

31 sheets · 155 questions · GCSE

March 2018 compilationAll answers

Every sheet in March 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 March 2018A network administrator is connecting 10 computers in a server room. Calculate the number of cables needed for a full mesh topology, and state the number needed for a star topology with one central switch.
  2. 2nd March 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.
  3. 3rd March 2018Convert the 4-bit binary number 1101 to denary.
  4. 4th March 2018Two 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.
  5. 5th March 2018State why an organisation might employ penetration testers to test its network.
  6. 6th March 2018An array named temps holds 12 values. State the index of the first item and the index of the last item.
  7. 7th March 2018State one example of a file format that commonly uses lossy compression.
  8. 8th March 2018State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  9. 9th March 2018State whether the source code of proprietary (closed source) software is normally available for the public to view.
  10. 10th March 2018Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  11. 11th March 2018A 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.
  12. 12th March 2018Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  13. 13th March 2018State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  14. 14th March 2018Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  15. 15th March 2018A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  16. 16th March 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.
  17. 17th March 2018Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  18. 18th March 2018State the two values a Boolean data type can hold.
  19. 19th March 2018Convert the denary number 39 to an 8-bit binary number, showing your working.
  20. 20th March 2018Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  21. 21st March 2018State why a program written in a high level language must be translated.
  22. 22nd March 2018Convert the hexadecimal number 1A to denary.
  23. 23rd March 2018Convert the denary number 156 to an 8 bit binary number.
  24. 24th March 2018Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  25. 25th March 2018Describe what a nested loop does when it processes a 2D array.
  26. 26th March 2018An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  27. 27th March 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.
  28. 28th March 2018Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  29. 29th March 2018Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  30. 30th March 2018Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
  31. 31st March 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.