Daily Practice · GCSE Computer Science
July 2013 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in July 2013, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in July 2013
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 2013State one example of a file format that commonly uses lossy compression.
- 2nd July 2013State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 3rd July 2013State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 4th July 2013Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 5th July 2013State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 6th July 2013Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 7th July 2013Give two reasons why network communication is divided into layers.
- 8th July 2013Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 9th July 2013A 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.
- 10th July 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.
- 11th July 2013Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 12th July 2013State the two values a Boolean data type can hold.
- 13th July 2013State how many different values can be represented using 5 bits, and explain your reasoning.
- 14th July 2013Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 15th July 2013Explain why an interpreter is often preferred while a program is being written.
- 16th July 2013Convert the hexadecimal number 1A to denary.
- 17th July 2013Convert the denary number 156 to an 8 bit binary number.
- 18th July 2013Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 19th July 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.
- 20th July 2013An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 21st July 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.
- 22nd July 2013Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 23rd July 2013Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 24th July 2013State the key difference between a procedure and a function.
- 25th July 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.
- 26th July 2013State the layer that IP operates in, and describe its job.
- 27th July 2013Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 28th July 2013Give one advantage of a relational database over a flat-file database.
- 29th July 2013Define the term 'interrupt' as used to describe a signal received by a CPU.
- 30th July 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.
- 31st July 2013Evaluate X = NOT A AND B when A = 0 and B = 1.