Daily Practice · GCSE Computer Science
January 2021 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in January 2021, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in January 2021
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st January 2021Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 2nd January 2021Define the term protocol.
- 3rd January 2021Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 4th January 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.
- 5th January 2021Each pair from the previous question is stored using 2 bytes. Calculate the compression ratio achieved, given the uncompressed row (1 byte per pixel) uses 8 bytes.
- 6th January 2021Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 7th January 2021State the two values a Boolean data type can hold.
- 8th January 2021State how many different values can be represented using 5 bits, and explain your reasoning.
- 9th January 2021Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 10th January 2021Explain the purpose of a breakpoint.
- 11th January 2021Convert the hexadecimal number 1A to denary.
- 12th January 2021Convert the denary number 156 to an 8 bit binary number.
- 13th January 2021Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 14th January 2021Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 15th January 2021An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 16th January 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.
- 17th January 2021Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 18th January 2021Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 19th January 2021State the key difference between a procedure and a function.
- 20th January 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.
- 21st January 2021Name the four layers of the TCP/IP model in order from the one closest to the user.
- 22nd January 2021Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 23rd January 2021Give one advantage of a relational database over a flat-file database.
- 24th January 2021Define the term 'interrupt' as used to describe a signal received by a CPU.
- 25th January 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.
- 26th January 2021Evaluate X = NOT A AND B when A = 0 and B = 1.
- 27th January 2021Convert the hexadecimal number 3F to denary.
- 28th January 2021Give one advantage of a star topology compared with a mesh topology.
- 29th January 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.
- 30th January 2021Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 31st January 2021State the three stages of the fetch-decode-execute cycle in the order they occur.