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Daily Practice · GCSE Computer Science

May 1981 5-a-day

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May 1981

31 sheets · 155 questions · GCSE

May 1981 compilationAll answers

Every sheet in May 1981

The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.

  1. 1st May 1981Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  2. 2nd May 1981A 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.
  3. 3rd May 1981Explain the purpose of a breakpoint.
  4. 4th May 1981Convert the 4-bit binary number 1101 to denary.
  5. 5th May 1981Two 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.
  6. 6th May 1981State why an organisation might employ penetration testers to test its network.
  7. 7th May 1981Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  8. 8th May 1981State one example of a file format that commonly uses lossy compression.
  9. 9th May 1981State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  10. 10th May 1981State whether the source code of proprietary (closed source) software is normally available for the public to view.
  11. 11th May 1981Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  12. 12th May 1981A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
  13. 13th May 1981Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  14. 14th May 1981Name the four layers of the TCP/IP model in order from the one closest to the user.
  15. 15th May 1981Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  16. 16th May 1981A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;
  17. 17th May 1981Each 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.
  18. 18th May 1981Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  19. 19th May 1981State the two values a Boolean data type can hold.
  20. 20th May 1981Convert the 8-bit binary number 01011010 to denary.
  21. 21st May 1981Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  22. 22nd May 1981A 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.
  23. 23rd May 1981Convert the hexadecimal number 1A to denary.
  24. 24th May 1981Convert the denary number 156 to an 8 bit binary number.
  25. 25th May 1981Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  26. 26th May 1981An array named temps holds 12 values. State the index of the first item and the index of the last item.
  27. 27th May 1981An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  28. 28th May 1981A 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.
  29. 29th May 1981Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  30. 30th May 1981Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  31. 31st May 1981Write the pseudocode header and body for a function called isAdult that takes one integer parameter called age and returns True if age is 18 or over.