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Daily Practice · GCSE Computer Science

July 1985 5-a-day

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July 1985

31 sheets · 155 questions · GCSE

July 1985 compilationAll answers

Every sheet in July 1985

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 1985Explain why an interpreter is often preferred while a program is being written.
  2. 2nd July 1985Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  3. 3rd July 1985State the three stages of the fetch-decode-execute cycle in the order they occur.
  4. 4th July 1985State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  5. 5th July 1985A 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.
  6. 6th July 1985Define the term 'pixel'.
  7. 7th July 1985Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  8. 8th July 1985Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  9. 9th July 1985Evaluate the expression 23 DIV 4.
  10. 10th July 1985A 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.
  11. 11th July 1985A 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.
  12. 12th July 1985State the layer that IP operates in, and describe its job.
  13. 13th July 1985A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  14. 14th July 1985A 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;
  15. 15th July 1985A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  16. 16th July 1985An 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.
  17. 17th July 1985Complete: NOT 0 = ?
  18. 18th July 1985Convert the 8-bit binary number 01011010 to denary.
  19. 19th July 1985State what LAN stands for.
  20. 20th July 1985Describe what syntax highlighting is and how it helps a programmer.
  21. 21st July 1985An 8-bit register stores the value 01100000 (denary 96). State the resulting 8-bit binary value after a left shift by 1 place, and state whether an overflow occurs.
  22. 22nd July 1985Which CPU register holds the address of the next instruction to be fetched?
  23. 23rd July 1985Distinguish between the network security threats known as phishing and pharming.
  24. 24th July 1985Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
  25. 25th July 1985A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  26. 26th July 1985A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  27. 27th July 1985A streaming company records which shows each user watches and uses this to recommend similar shows. Explain one ethical concern this could raise, even if the company only uses the data to improve recommendations.
  28. 28th July 1985State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  29. 29th July 1985Write 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.
  30. 30th July 1985Give one example of an optical secondary storage device.
  31. 31st July 1985Explain the role of TCP when a large file is downloaded.