Daily Practice · GCSE Computer Science
November 2013 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in November 2013, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in November 2013
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st November 2013Each 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.
- 2nd November 2013Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 3rd November 2013State the two values a Boolean data type can hold.
- 4th November 2013Convert the 8-bit binary number 01011010 to denary.
- 5th November 2013Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 6th November 2013State why a program written in a high level language must be translated.
- 7th November 2013Convert the hexadecimal number 1A to denary.
- 8th November 2013Convert the denary number 156 to an 8 bit binary number.
- 9th November 2013Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 10th November 2013Describe what a nested loop does when it processes a 2D array.
- 11th November 2013An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 12th November 2013A 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.
- 13th November 2013Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 14th November 2013Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 15th November 2013Write 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.
- 16th November 2013A 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.
- 17th November 2013Give two reasons why network communication is divided into layers.
- 18th November 2013Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 19th November 2013State what a foreign key is used for.
- 20th November 2013Define the term 'interrupt' as used to describe a signal received by a CPU.
- 21st November 2013An 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.
- 22nd November 2013Evaluate X = NOT A AND B when A = 0 and B = 1.
- 23rd November 2013A 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.
- 24th November 2013Give one advantage of a star topology compared with a mesh topology.
- 25th November 2013Explain why an interpreter is often preferred while a program is being written.
- 26th November 2013Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 27th November 2013State the three stages of the fetch-decode-execute cycle in the order they occur.
- 28th November 2013State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 29th November 2013A 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.
- 30th November 2013Define the term 'pixel'.