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Daily Practice · GCSE Computer Science

August 1987 5-a-day

← Today's GCSE Computer Science sheet

August 1987

31 sheets · 155 questions · GCSE

August 1987 compilationAll answers

Every sheet in August 1987

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

  1. 1st August 1987Convert the 4-bit binary number 1101 to denary.
  2. 2nd August 1987Two 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.
  3. 3rd August 1987State why an organisation might employ penetration testers to test its network.
  4. 4th August 1987An array named temps holds 12 values. State the index of the first item and the index of the last item.
  5. 5th August 1987State one example of a file format that commonly uses lossy compression.
  6. 6th August 1987State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  7. 7th August 1987State whether the source code of proprietary (closed source) software is normally available for the public to view.
  8. 8th August 1987Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  9. 9th August 1987A 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.
  10. 10th August 1987Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  11. 11th August 1987State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  12. 12th August 1987Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  13. 13th August 1987A 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;
  14. 14th August 1987Each 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.
  15. 15th August 1987Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  16. 16th August 1987State the two values a Boolean data type can hold.
  17. 17th August 1987Convert the 8-bit binary number 01011010 to denary.
  18. 18th August 1987Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  19. 19th August 1987State why a program written in a high level language must be translated.
  20. 20th August 1987Convert the hexadecimal number 1A to denary.
  21. 21st August 1987Convert the denary number 156 to an 8 bit binary number.
  22. 22nd August 1987Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  23. 23rd August 1987Describe what a nested loop does when it processes a 2D array.
  24. 24th August 1987An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  25. 25th August 1987A 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.
  26. 26th August 1987Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  27. 27th August 1987Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  28. 28th August 1987Write 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.
  29. 29th August 1987A 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.
  30. 30th August 1987Give two reasons why network communication is divided into layers.
  31. 31st August 1987Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.