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Daily Practice · GCSE Computer Science

November 1993 - GCSE Computer Science 5-a-day

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November 1993

30 sheets · 150 questions · GCSE

November 1993 compilationAll answers

Every sheet in November 1993

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

  1. 1st November 1993State one example of a file format that commonly uses lossy compression.
  2. 2nd November 1993State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  3. 3rd November 1993State whether the source code of proprietary (closed source) software is normally available for the public to view.
  4. 4th November 1993Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  5. 5th November 1993A 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.
  6. 6th November 1993Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  7. 7th November 1993Give two reasons why network communication is divided into layers.
  8. 8th November 1993Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  9. 9th November 1993A 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;
  10. 10th November 1993Each 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.
  11. 11th November 1993Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  12. 12th November 1993State the two values a Boolean data type can hold.
  13. 13th November 1993Convert the 8-bit binary number 01011010 to denary.
  14. 14th November 1993Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  15. 15th November 1993Explain why an interpreter is often preferred while a program is being written.
  16. 16th November 1993Convert the hexadecimal number 1A to denary.
  17. 17th November 1993Convert the denary number 156 to an 8 bit binary number.
  18. 18th November 1993Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  19. 19th November 1993A 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.
  20. 20th November 1993An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  21. 21st November 1993A 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.
  22. 22nd November 1993Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  23. 23rd November 1993Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  24. 24th November 1993Write 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.
  25. 25th November 1993A 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.
  26. 26th November 1993State the layer that IP operates in, and describe its job.
  27. 27th November 1993Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  28. 28th November 1993State what a foreign key is used for.
  29. 29th November 1993Define the term 'interrupt' as used to describe a signal received by a CPU.
  30. 30th November 1993An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.