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Daily Practice · GCSE Computer Science

June 2021 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in June 2021, with answers. Systems, data representation, networks, algorithms and programming.

← Today's GCSE Computer Science sheet

June 2021

30 sheets · 150 questions · GCSE

June 2021 compilationAll answers

Every sheet in June 2021

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 2021State the value returned by LENGTH(word) if word stores the string 'Computer'.
  2. 2nd June 2021A 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.
  3. 3rd June 2021Name the four layers of the TCP/IP model in order from the one closest to the user.
  4. 4th June 2021A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  5. 5th June 2021A 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.
  6. 6th June 2021A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  7. 7th June 2021An 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.
  8. 8th June 2021Complete: NOT 0 = ?
  9. 9th June 2021State how many different values can be represented using 5 bits, and explain your reasoning.
  10. 10th June 2021State what LAN stands for.
  11. 11th June 2021A 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.
  12. 12th June 2021An 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.
  13. 13th June 2021Which CPU register holds the address of the next instruction to be fetched?
  14. 14th June 2021Distinguish between the network security threats known as phishing and pharming.
  15. 15th June 2021An array named temps holds 12 values. State the index of the first item and the index of the last item.
  16. 16th June 2021A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  17. 17th June 2021A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  18. 18th June 2021A 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.
  19. 19th June 2021State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  20. 20th June 2021State the key difference between a procedure and a function.
  21. 21st June 2021Give one example of an optical secondary storage device.
  22. 22nd June 2021State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  23. 23rd June 2021State the term used for realistic data that a program would be expected to handle during normal use.
  24. 24th June 2021Give one advantage of a relational database over a flat-file database.
  25. 25th June 2021State the difference between lossy and lossless compression.
  26. 26th June 2021State the condition that must be met before a binary search can be used on an array.
  27. 27th June 2021A logic circuit has inputs C and D. C feeds into a NOT gate; the output of the NOT gate and D feed into an OR gate, giving output Y. Write the Boolean expression for Y and state its value when C = 1 and D = 0.
  28. 28th June 2021Convert the hexadecimal number 3F to denary.
  29. 29th June 2021Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  30. 30th June 2021State why a program written in a high level language must be translated.