Daily Practice · GCSE Computer Science
October 2025 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in October 2025, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in October 2025
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 2025An 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.
- 2nd October 2025Evaluate X = NOT A AND B when A = 0 and B = 1.
- 3rd October 2025Convert the hexadecimal number FF to an 8-bit binary number.
- 4th October 2025Give one advantage of a star topology compared with a mesh topology.
- 5th October 2025Explain the purpose of a breakpoint.
- 6th October 2025Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 7th October 2025State the three stages of the fetch-decode-execute cycle in the order they occur.
- 8th October 2025State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 9th October 2025Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 10th October 2025Define the term 'pixel'.
- 11th October 2025Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 12th October 2025Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 13th October 2025Evaluate the expression 23 DIV 4.
- 14th October 2025State the correct order of the three operations used to read data from a text file.
- 15th October 2025A 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.
- 16th October 2025Name the four layers of the TCP/IP model in order from the one closest to the user.
- 17th October 2025A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 18th October 2025A table called products has fields productId, name, price and stock. Write an SQL statement that changes the price of the product with productId 7 to 15.99.
- 19th October 2025A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 20th October 2025An 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.
- 21st October 2025Complete: NOT 0 = ?
- 22nd October 2025Convert the denary number 200 to hexadecimal, showing your working.
- 23rd October 2025State what LAN stands for.
- 24th October 2025A 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.
- 25th October 2025An 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.
- 26th October 2025Which CPU register holds the address of the next instruction to be fetched?
- 27th October 2025Distinguish between the network security threats known as phishing and pharming.
- 28th October 2025An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 29th October 2025A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 30th October 2025A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 31st October 2025A 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.