Section C - 3 - Text & Image Representation - Text Represent

What is a character set?

Choose two statements that are true.

• It uses 4 bits per character or symbol.

• They are a defined list of characters and symbols with associated binary codes.

• There are different character sets that your computer can use.

• Computers can only use a single character set that is built into the operating system.

Sometimes when you open a text file, the document displays strange characters.

Which two of the following are possible reasons for this?

• It may have tried to decode text that you’ve saved using the wrong character set.

• It may be encoded using a font that isn't installed on your device.

• It may try and encode with the wrong character set, discarding data that doesn't fit with the character set.

• The computers CPU may not be compatible with the character set used to encode the data.

How many characters can ASCII represent?

• 7

• 128

• 256

• 65535

What is the issue with ASCII?

• It can only represent English characters and symbols.

• It uses too many bits per character causing large file sizes.

• Not many software programs are compatible with ASCII.

• There are no issues with ASCII.

How many bits does UNICODE use to encode characters?

• 8

• 16

• 32

• All of the above

A disadvantage of UTF-8 is that it isn’t backwards compatible with ASCII?

• True

• False

What character set is most commonly used on the web?

• ASCII

• UTF-8

• UTF-16

• UTF-32

Why is UTF-32 rarely used?

• It can only represent 128 characters, which isn't enough for all languages in the world.

• It isn't compatible with most software programs.

• It uses 32 bits for every character, which causes large file sizes.

• It isn't rarely used.