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Daily Practice · GCSE Computer Science

July 1955 5-a-day

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July 1955

31 sheets · 155 questions · GCSE

July 1955 compilationAll answers

Every sheet in July 1955

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

  1. 1st July 1955An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  2. 2nd July 1955A 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.
  3. 3rd July 1955Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  4. 4th July 1955Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  5. 5th July 1955State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  6. 6th July 1955A 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.
  7. 7th July 1955Name the four layers of the TCP/IP model in order from the one closest to the user.
  8. 8th July 1955Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  9. 9th July 1955Define the term 'primary key' as used in a database table.
  10. 10th July 1955Define the term 'interrupt' as used to describe a signal received by a CPU.
  11. 11th July 1955An 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.
  12. 12th July 1955Evaluate X = NOT A AND B when A = 0 and B = 1.
  13. 13th July 1955Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  14. 14th July 1955Give one advantage of a star topology compared with a mesh topology.
  15. 15th July 1955A 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.
  16. 16th July 1955Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  17. 17th July 1955State the three stages of the fetch-decode-execute cycle in the order they occur.
  18. 18th July 1955State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  19. 19th July 1955An array named temps holds 12 values. State the index of the first item and the index of the last item.
  20. 20th July 1955Define the term 'pixel'.
  21. 21st July 1955Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  22. 22nd July 1955Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  23. 23rd July 1955Evaluate the expression 23 DIV 4.
  24. 24th July 1955A 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.
  25. 25th July 1955A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.
  26. 26th July 1955State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  27. 27th July 1955A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  28. 28th July 1955A 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;
  29. 29th July 1955A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  30. 30th July 1955An array contains [9, 2, 6], to be sorted using insertion sort. Show the state of the array after each new element has been inserted into its correct position.
  31. 31st July 1955Complete: NOT 0 = ?