Daily Practice · GCSE Computer Science
April 2007 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in April 2007, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in April 2007
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 2007Two CPUs are compared for a task optimised for multiple cores: CPU A has 2 cores at 4.2 GHz; CPU B has 6 cores at 3.0 GHz. Explain which CPU is likely to perform better for this task.
- 2nd April 2007State why an organisation might employ penetration testers to test its network.
- 3rd April 2007An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 4th April 2007State one example of a file format that commonly uses lossy compression.
- 5th April 2007State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 6th April 2007State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 7th April 2007Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 8th April 2007State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 9th April 2007Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 10th April 2007State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 11th April 2007Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 12th April 2007A 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.
- 13th April 2007Each 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.
- 14th April 2007Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 15th April 2007State the two values a Boolean data type can hold.
- 16th April 2007State how many different values can be represented using 5 bits, and explain your reasoning.
- 17th April 2007Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 18th April 2007State why a program written in a high level language must be translated.
- 19th April 2007Convert the hexadecimal number 1A to denary.
- 20th April 2007Convert the denary number 156 to an 8 bit binary number.
- 21st April 2007Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 22nd April 2007Describe what a nested loop does when it processes a 2D array.
- 23rd April 2007An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 24th April 2007A 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.
- 25th April 2007Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 26th April 2007Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 27th April 2007State the key difference between a procedure and a function.
- 28th April 2007A 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.
- 29th April 2007Give two reasons why network communication is divided into layers.
- 30th April 2007Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.