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Daily Practice · GCSE Computer Science

May 1991 5-a-day

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May 1991

31 sheets · 155 questions · GCSE

May 1991 compilationAll answers

Every sheet in May 1991

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 1991Two 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 May 1991State why an organisation might employ penetration testers to test its network.
  3. 3rd May 1991A 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.
  4. 4th May 1991State one example of a file format that commonly uses lossy compression.
  5. 5th May 1991State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  6. 6th May 1991State whether the source code of proprietary (closed source) software is normally available for the public to view.
  7. 7th May 1991Write 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 May 1991A 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.
  9. 9th May 1991Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  10. 10th May 1991State the layer that IP operates in, and describe its job.
  11. 11th May 1991Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  12. 12th May 1991A 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;
  13. 13th May 1991Each 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 May 1991Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  15. 15th May 1991State the two values a Boolean data type can hold.
  16. 16th May 1991Convert the 8-bit binary number 01011010 to denary.
  17. 17th May 1991Calculate 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 May 1991Describe what syntax highlighting is and how it helps a programmer.
  19. 19th May 1991Convert the hexadecimal number 1A to denary.
  20. 20th May 1991Convert the denary number 156 to an 8 bit binary number.
  21. 21st May 1991Which 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 May 1991Trace 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).
  23. 23rd May 1991An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  24. 24th May 1991A 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 May 1991Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  26. 26th May 1991Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  27. 27th May 1991Write 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.
  28. 28th May 1991A 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 May 1991Explain the role of TCP when a large file is downloaded.
  30. 30th May 1991Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  31. 31st May 1991State what a foreign key is used for.