KS3 Data Representation L4 ASCII

What is a character set?

• 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.

What is the binary code for "Q"

• 101 0001

• 111 0001

• 101 0010

• 111 0010

What is the binary code for "1"

• 011 0001

• 101 0001

• 011 0010

• 101 0011

100 0000 is the binary code for...

• @

• 0

• A

• P

010 0001 is the binary code for...

• !

• #

• %

• b