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Daily Practice · GCSE Computer Science

June 1991 5-a-day

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June 1991

30 sheets · 150 questions · GCSE

June 1991 compilationAll answers

Every sheet in June 1991

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

  1. 1st June 1991Define the term 'interrupt' as used to describe a signal received by a CPU.
  2. 2nd June 1991An 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.
  3. 3rd June 1991Evaluate X = NOT A AND B when A = 0 and B = 1.
  4. 4th June 1991A 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.
  5. 5th June 1991Give one advantage of a star topology compared with a mesh topology.
  6. 6th June 1991Give one advantage and one disadvantage of using a compiler.
  7. 7th June 1991Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  8. 8th June 1991State the three stages of the fetch-decode-execute cycle in the order they occur.
  9. 9th June 1991State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  10. 10th June 1991Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  11. 11th June 1991Define the term 'pixel'.
  12. 12th June 1991Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  13. 13th June 1991Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  14. 14th June 1991Evaluate the expression 23 DIV 4.
  15. 15th June 1991State the value returned by LENGTH(word) if word stores the string 'Computer'.
  16. 16th June 1991A 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.
  17. 17th June 1991A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?
  18. 18th June 1991A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  19. 19th June 1991A 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.
  20. 20th June 1991A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  21. 21st June 1991An 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.
  22. 22nd June 1991Complete: NOT 0 = ?
  23. 23rd June 1991State how many different values can be represented using 5 bits, and explain your reasoning.
  24. 24th June 1991State what LAN stands for.
  25. 25th June 1991Name the translator used for assembly language and describe how it differs from a compiler.
  26. 26th June 1991An 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.
  27. 27th June 1991Which CPU register holds the address of the next instruction to be fetched?
  28. 28th June 1991Distinguish between the network security threats known as phishing and pharming.
  29. 29th June 1991Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
  30. 30th June 1991A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.