CS Edexcel 2.2a Characters

When considering representation of text, what is a ‘character’?

• A single number, symbol or letter

• A binary value

• A data type

ASCII stands for:

• American Standard Code for Information Interchange

• American Standard Computer Information Interface

• Advanced System Code for Internet Interchange

• Automated System for Computer Information

How many characters can be stored in ASCII and how many bits does ASCII use?

• 128 characters, 7 bits

• 256 characters, 8 bits

• 64 characters, 6 bits

• 512 characters, 9 bits

How many characters can be stored in extended ASCII and how many bits does extended ASCII use?

• 128 characters, 7 bits

• 256 characters, 8 bits

• 512 characters, 9 bits

• 1024 characters, 10 bits

The main limitation of ASCII is that it can only represent a limited number of characters. What has been developed to overcome this limitation?

• Unicode

• UTF-8

• ISO-8859-1

• Universal ASCII

Why do many eastern countries make use of the UNICODE character set?

• Because it supports a wide range of characters from different languages.

• Because it is faster than other character sets.

• Because it is cheaper to implement.

• Because it is the only character set available.

Which character representation set do Emojis use?

​ (a)  

• Unicode
• ASCII
• Extended ASCII

ASCII uses​ (a)   and Unicode uses​ (b)   to represent characters.

• binary codes
• hexadecimal codes
• denary codes