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Daily Practice · GCSE Computer Science

September 2015 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in September 2015, with answers. Systems, data representation, networks, algorithms and programming.

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September 2015

30 sheets · 150 questions · GCSE

September 2015 compilationAll answers

Every sheet in September 2015

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 2015A 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 September 2015State why a program written in a high level language must be translated.
  3. 3rd September 2015Convert the 4-bit binary number 1101 to denary.
  4. 4th September 2015Two 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 September 2015State why an organisation might employ penetration testers to test its network.
  6. 6th September 2015Describe what a nested loop does when it processes a 2D array.
  7. 7th September 2015State one example of a file format that commonly uses lossy compression.
  8. 8th September 2015State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  9. 9th September 2015State whether the source code of proprietary (closed source) software is normally available for the public to view.
  10. 10th September 2015Write 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 September 2015A 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 September 2015Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  13. 13th September 2015Give two reasons why network communication is divided into layers.
  14. 14th September 2015Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  15. 15th September 2015A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  16. 16th September 2015Each 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 September 2015Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  18. 18th September 2015State the two values a Boolean data type can hold.
  19. 19th September 2015Convert the denary number 39 to an 8-bit binary number, showing your working.
  20. 20th September 2015Calculate 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 September 2015Explain why an interpreter is often preferred while a program is being written.
  22. 22nd September 2015Convert the hexadecimal number 1A to denary.
  23. 23rd September 2015Convert the denary number 156 to an 8 bit binary number.
  24. 24th September 2015Which 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 September 2015A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
  26. 26th September 2015An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  27. 27th September 2015A 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 September 2015Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  29. 29th September 2015Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  30. 30th September 2015Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c