OCR CS 1.2 Revision

What is a 'character-set'?

• A set of instructions for a computer program
• A mapping between characters and their binary representations
• A type of computer virus
• A method of data encryption

Which of the following is an example of a character-set?

• JPEG
• MP3
• ASCII
• HTML

How many bits are in a byte?

• 4
• 8
• 16
• 32

What is the purpose of representing characters in binary?

• To make text smaller
• To allow computers to process and store text
• To display colorful text
• To prevent plagiarism

If a character set uses 7 bits per character, how many different characters can it represent?

• 64
• 128
• 256
• 512

What does ASCII stand for?

• American Standard Code for Information Interchange
• Advanced System Code for Internet Communication
• All Symbols Code for International Interchange
• American Scientific Code for Information Infrastructure

Which character set is commonly used to represent a wider range of characters, including those from different languages?

• Binary
• Decimal
• ASCII
• Unicode

How many bits does Unicode typically use to represent each character?

• 7
• 8
• 16 or more
• 4

What is the minimum number of bits needed to represent 256 different characters?

• 4
• 7
• 8
• 16

Which of these can ASCII represent?

• All the world's writing systems
• Only English characters
• Emojis and symbols from all languages
• Images and audio