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Daily Practice · GCSE Computer Science

February 1990 5-a-day

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February 1990

28 sheets · 140 questions · GCSE

February 1990 compilationAll answers

Every sheet in February 1990

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

  1. 1st February 1990Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  2. 2nd February 1990State one example of a file format that commonly uses lossy compression.
  3. 3rd February 1990State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  4. 4th February 1990State whether the source code of proprietary (closed source) software is normally available for the public to view.
  5. 5th February 1990Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  6. 6th February 1990A 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.
  7. 7th February 1990Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  8. 8th February 1990Name the four layers of the TCP/IP model in order from the one closest to the user.
  9. 9th February 1990Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  10. 10th February 1990A 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;
  11. 11th February 1990Each 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.
  12. 12th February 1990Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  13. 13th February 1990State the two values a Boolean data type can hold.
  14. 14th February 1990Convert the 8-bit binary number 01011010 to denary.
  15. 15th February 1990Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  16. 16th February 1990A 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.
  17. 17th February 1990Convert the hexadecimal number 1A to denary.
  18. 18th February 1990Convert the denary number 156 to an 8 bit binary number.
  19. 19th February 1990Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  20. 20th February 1990An array named temps holds 12 values. State the index of the first item and the index of the last item.
  21. 21st February 1990An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  22. 22nd February 1990A 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.
  23. 23rd February 1990Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  24. 24th February 1990Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  25. 25th February 1990Write 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.
  26. 26th February 1990A 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.
  27. 27th February 1990State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  28. 28th February 1990Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.