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Daily Practice · GCSE Computer Science

March 1990 5-a-day

← Today's GCSE Computer Science sheet

March 1990

31 sheets · 155 questions · GCSE

March 1990 compilationAll answers

Every sheet in March 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 March 1990State what a foreign key is used for.
  2. 2nd March 1990Define the term 'interrupt' as used to describe a signal received by a CPU.
  3. 3rd March 1990An 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.
  4. 4th March 1990Evaluate X = NOT A AND B when A = 0 and B = 1.
  5. 5th March 1990A pseudocode algorithm is: count <- 0, x <- 10, WHILE x > 0, count <- count + 1, x <- x - 3, ENDWHILE, OUTPUT count. Complete a trace table for x and count, laid out as x | count, then state the value output.
  6. 6th March 1990Give one advantage of a star topology compared with a mesh topology.
  7. 7th March 1990State why a program written in a high level language must be translated.
  8. 8th March 1990Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  9. 9th March 1990State the three stages of the fetch-decode-execute cycle in the order they occur.
  10. 10th March 1990State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  11. 11th March 1990Describe what a nested loop does when it processes a 2D array.
  12. 12th March 1990Define the term 'pixel'.
  13. 13th March 1990Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  14. 14th March 1990Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  15. 15th March 1990Evaluate the expression 23 DIV 4.
  16. 16th March 1990State the value returned by LENGTH(word) if word stores the string 'Computer'.
  17. 17th March 1990A 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.
  18. 18th March 1990Give two reasons why network communication is divided into layers.
  19. 19th March 1990A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  20. 20th March 1990A table called books has fields bookId, title, authorId and copiesAvailable. Write an SQL statement that selects the title of every book with more than 2 copies available.
  21. 21st March 1990A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  22. 22nd March 1990An 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.
  23. 23rd March 1990Complete: NOT 0 = ?
  24. 24th March 1990State how many different values can be represented using 5 bits, and explain your reasoning.
  25. 25th March 1990State what LAN stands for.
  26. 26th March 1990Explain why an interpreter is often preferred while a program is being written.
  27. 27th March 1990An 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.
  28. 28th March 1990Which CPU register holds the address of the next instruction to be fetched?
  29. 29th March 1990Distinguish between the network security threats known as phishing and pharming.
  30. 30th March 1990A 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.
  31. 31st March 1990A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.