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Qualifications OCR GCSE Computer Science 1.2 Memory & Storage

Character Sets

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What is a character in the context of computing?
An individual letter, number, or symbol
How many characters can standard ASCII represent?
128 characters
True or False: ASCII uses 8 bits to represent each character.
FALSE
What is the primary purpose of a character set in computing?
To convert unique binary numbers into characters we use
Why was ASCII needed originally?
To standardise the representation of text on computers
What limitation did ASCII face with global computer use?
It could only represent characters within the English language
How did ASCII Extended improve upon the original ASCII?
By using 8 bits, allowing for 256 characters, including additional Latin characters
What is a key feature of Unicode compared to ASCII?
Unicode can represent around 65,000 characters
True or False: The first 128 characters in Unicode match those in ASCII.
TRUE
Which of the following are benefits of using Unicode?
Almost all devices can decode text using Unicode
It contains a large number of the world's symbols
How does the ASCII character set order its characters?
In a logical order, where similar characters are grouped together (e.g., A followed by B)
Why is backward compatibility important in character sets like Unicode?
To ensure older texts and systems using ASCII can still be understood and used
What is a major advantage of using 16 bits in Unicode compared to 7 bits in ASCII?
It allows for a much larger number of characters to be represented
How do character sets contribute to the functionality of the web and email?
It provided a standard way of representing text across different computers
What was a key reason for the transition from ASCII to Unicode in computing?
The need for a character set that could accommodate a wider variety of languages and symbols
True or False: The ASCII character set includes control characters.
TRUE
Given that ASCII characters are sequential and 'J' is 74 in decimal, what decimal number represents 'I'?
73
If 'A' in ASCII is 65 in decimal, what is 'E' in decimal?
69