Daily Practice · GCSE Computer Science
February 2020 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in February 2020, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in February 2020
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 2020Convert the 8-bit binary number 01011010 to denary.
- 2nd February 2020Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 3rd February 2020Explain why an interpreter is often preferred while a program is being written.
- 4th February 2020Convert the hexadecimal number 1A to denary.
- 5th February 2020Convert the denary number 156 to an 8 bit binary number.
- 6th February 2020Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 7th February 2020A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
- 8th February 2020An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 9th February 2020A 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.
- 10th February 2020Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 11th February 2020Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 12th February 2020Write 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 February 2020A 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.
- 14th February 2020State the layer that IP operates in, and describe its job.
- 15th February 2020Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 16th February 2020State what a foreign key is used for.
- 17th February 2020Define the term 'interrupt' as used to describe a signal received by a CPU.
- 18th February 2020An 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.
- 19th February 2020Evaluate X = NOT A AND B when A = 0 and B = 1.
- 20th February 2020A 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 February 2020Give one advantage of a star topology compared with a mesh topology.
- 22nd February 2020Describe what syntax highlighting is and how it helps a programmer.
- 23rd February 2020Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 24th February 2020State the three stages of the fetch-decode-execute cycle in the order they occur.
- 25th February 2020State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 26th February 2020Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
- 27th February 2020Define the term 'pixel'.
- 28th February 2020Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 29th February 2020Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?