Daily Practice · GCSE Computer Science
February 2015 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in February 2015, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in February 2015
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 2015Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 2nd February 2015State the two values a Boolean data type can hold.
- 3rd February 2015Convert the 8-bit binary number 01011010 to denary.
- 4th February 2015Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 5th February 2015Give one advantage and one disadvantage of using a compiler.
- 6th February 2015Convert the hexadecimal number 1A to denary.
- 7th February 2015Convert the denary number 156 to an 8 bit binary number.
- 8th February 2015Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 9th February 2015Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 10th February 2015An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 11th February 2015A 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.
- 12th February 2015Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 13th February 2015Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 14th February 2015Write 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.
- 15th February 2015A 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.
- 16th February 2015A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?
- 17th February 2015Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 18th February 2015State what a foreign key is used for.
- 19th February 2015Define the term 'interrupt' as used to describe a signal received by a CPU.
- 20th February 2015An 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.
- 21st February 2015Evaluate X = NOT A AND B when A = 0 and B = 1.
- 22nd February 2015A 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.
- 23rd February 2015Give one advantage of a star topology compared with a mesh topology.
- 24th February 2015Name the translator used for assembly language and describe how it differs from a compiler.
- 25th February 2015Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 26th February 2015State the three stages of the fetch-decode-execute cycle in the order they occur.
- 27th February 2015State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 28th February 2015Explain what happens if a program tries to read index 5 of an array declared with 5 elements.