Daily Practice · GCSE Computer Science
May 2021 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in May 2021, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in May 2021
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st May 2021State the two values a Boolean data type can hold.
- 2nd May 2021Convert the 8-bit binary number 01011010 to denary.
- 3rd May 2021Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 4th May 2021Name the translator used for assembly language and describe how it differs from a compiler.
- 5th May 2021Convert the hexadecimal number 1A to denary.
- 6th May 2021Convert the denary number 156 to an 8 bit binary number.
- 7th May 2021Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 8th May 2021Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 9th May 2021An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 10th May 2021A CPU's cache has a hit rate of 80%. During a task the CPU makes 4000 requests for data. Calculate the number of cache hits and cache misses.
- 11th May 2021Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 12th May 2021Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 13th May 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.
- 14th May 2021A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
- 15th May 2021Define the term protocol.
- 16th May 2021Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 17th May 2021State what a foreign key is used for.
- 18th May 2021Define the term 'interrupt' as used to describe a signal received by a CPU.
- 19th May 2021An 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.
- 20th May 2021Evaluate X = NOT A AND B when A = 0 and B = 1.
- 21st May 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.
- 22nd May 2021Give one advantage of a star topology compared with a mesh topology.
- 23rd May 2021Explain the purpose of a breakpoint.
- 24th May 2021Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 25th May 2021State the three stages of the fetch-decode-execute cycle in the order they occur.
- 26th May 2021State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 27th May 2021Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 28th May 2021Define the term 'pixel'.
- 29th May 2021Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 30th May 2021Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 31st May 2021Evaluate the expression 23 DIV 4.