Daily Practice · GCSE Computer Science
October 2021 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in October 2021, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in October 2021
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 2021Convert the 8-bit binary number 01011010 to denary.
- 2nd October 2021State what LAN stands for.
- 3rd October 2021Explain the purpose of a breakpoint.
- 4th October 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.
- 5th October 2021Which CPU register holds the address of the next instruction to be fetched?
- 6th October 2021Distinguish between the network security threats known as phishing and pharming.
- 7th October 2021Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 8th October 2021A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 9th October 2021A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 10th October 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.
- 11th October 2021State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 12th October 2021Write 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.
- 13th October 2021Give one example of an optical secondary storage device.
- 14th October 2021Name the four layers of the TCP/IP model in order from the one closest to the user.
- 15th October 2021State the term used for realistic data that a program would be expected to handle during normal use.
- 16th October 2021State what a foreign key is used for.
- 17th October 2021State the difference between lossy and lossless compression.
- 18th October 2021State the condition that must be met before a binary search can be used on an array.
- 19th October 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.
- 20th October 2021A 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.
- 21st October 2021Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 22nd October 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.
- 23rd October 2021Convert the denary number 45 to hexadecimal.
- 24th October 2021What does the acronym CPU stand for?
- 25th October 2021State what the term malware means.
- 26th October 2021An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 27th October 2021An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
- 28th October 2021Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 29th October 2021Which piece of UK legislation controls how organisations must store and use people's personal data?
- 30th October 2021Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 31st October 2021State the value returned by LENGTH(word) if word stores the string 'Computer'.