12 - Representing characters

  sequences of binary numbers

  computer code



 2. Text needs to be converted into __________________ in order for a computer to convert/comprehend it.

  hexadecimal code

  binary numbers

  high level language code

  python code

 3. The most commonly used 'standard' or system that allows us to use the full range of characters (e.g. A - Z including upper and lower case) is:





 4. ASCII …..

  uses hexadecimal codes to represent each binary digit (e.g. 1 and 0)

  uses python code to translate each letter of the alphabet into something we can understand

  …uses binary codes to represent each character number and symbol in the chosen language

  …uses binary codes to hold either a 0 or a 1 to represent either A or B

 5. ASCII stands for: Australian Standard Code for Information Interchance



 6. The 7 bit ASCII code gives you 2 to the power of 8 possible values which is 128, so the….

  ASCII character set goes from 1 to 27

  ASCII character set goes from 0 to 127

  ASCII character set can store up to 256 + 100 characters

  ASCII character set goes from 0 to 123

 7. According to this ASCII table what is lowercase 'a'?





 8. What binary value does the 'backspace' key on your keyboard have?





 9. The decimal value of '35' corresponds to what ASCII value?

  The full stop "."

  The arrow >>

  The quotation mark "

  The hashtag #

 10. Standard ASCII only uses the first 128 binary numbers available out of a possible 256. _______________ take advantage of the other numbers

  other civilisations

  other languages (e.g German, Icelandic)

  other computers

  other programming languages like python or java

 11. The central point is that language and symbols can be represented as binary numbers within a computer



 12. When you press a key on your keyboard the ____________________ translates the signal produced from key's position into its binary code value

  binary digit group

  CPU set

  ASCII set

  character set

 13. Note that a character set is NOT a font and that a different language like Hindi would use a different character set.



 14. ASCII and extended ASCII can only cater for 256 symbols - what happens if a language requires more than this?

  We would need to use a character set that uses more than 1 byte (8 bits)

  A two byte scheme could be used to represent 65,000+ characters

  All of the above

  A two byte (16 bit) encoding standard coud be used like Unicode

 15. Look at the following list and select the statement from the options that is correct

  UTF is the same as ASCII

  There is no such thing as UTF-32

  There is no such thing as UTF as only ASCII and EBDIC exist

  UTF-8 is the most widely used way to represent Unicode text in web pages (as of 2018)