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Daily Practice · GCSE Computer Science

November 1978 5-a-day

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November 1978

30 sheets · 150 questions · GCSE

November 1978 compilationAll answers

Every sheet in November 1978

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 1978Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  2. 2nd November 1978A 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 November 1978A 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.
  4. 4th November 1978Convert the 4-bit binary number 1101 to denary.
  5. 5th November 1978Two 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 November 1978State why an organisation might employ penetration testers to test its network.
  7. 7th November 1978An array named temps holds 12 values. State the index of the first item and the index of the last item.
  8. 8th November 1978State one example of a file format that commonly uses lossy compression.
  9. 9th November 1978State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  10. 10th November 1978State whether the source code of proprietary (closed source) software is normally available for the public to view.
  11. 11th November 1978Write 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 November 1978A 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 November 1978Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  14. 14th November 1978State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  15. 15th November 1978Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  16. 16th November 1978A 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 November 1978Each 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 November 1978Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  19. 19th November 1978State the two values a Boolean data type can hold.
  20. 20th November 1978Convert the 8-bit binary number 01011010 to denary.
  21. 21st November 1978Calculate 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 November 1978State why a program written in a high level language must be translated.
  23. 23rd November 1978Convert the hexadecimal number 1A to denary.
  24. 24th November 1978Convert the denary number 156 to an 8 bit binary number.
  25. 25th November 1978Which 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 November 1978Describe what a nested loop does when it processes a 2D array.
  27. 27th November 1978An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  28. 28th November 1978A 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 November 1978Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  30. 30th November 1978Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.