iGCSE Computer Science: ASCII and Unicode

ASCII is an encoding system for text. What does ASCII stand for?

• American Standard Code for Information Interchange

• All System Code In Internet

• American Simple Code for Interesting Information

• Alpha Super Code Input Information

How many bits was used to encode the original ASCII character set?

• 7

• 8

• 16

• 4

What type of data is stored in the first 32 ASCII codes?

• Control codes

• Letters A-Z

• Numbers

• Punctuation symbols

The Extended ASCII system uses 8 bits per character instead of 7 bits. How many different characters can be represented in 8 bits?

• 1024

• 8

• 128

• 256

If 01000001 (65) is the ASCII code for the letter 'A' what is the binary code for 'E'?

• 01000011

• 01000101

• 01000110

• 01000111

If 065 is the ASCII code for 'A' and 097 is 'a', what text is encoded by: 085 110 105 099 111 100 101 032 097 110 100 032 065 083 067 073 073

• Compute the codes

• Unicode and ASCII

• ASCII is for text

• Computing is cool

If 097 is the ASCII code for lower case 'a', which is the correct encoding of the text "The quick brown fox"

• 084 104 101 032 113 117 105 099 107 032 098 114 111 119 110 032 102 111 120

• 067 117 114 105 111 117 115 032 103 114 101 101 110 032 105 100 101 097 115

• 067 111 109 112 117 116 105 110 103 032 105 115 032 099 111 111 108 033 033

• 084 104 101 032 115 108 111 119 032 111 108 100 032 104 111 114 115 101 032

How many characters are currently represented (in 2017) by the Unicode system?

• 21,977

• 1,250,569

• 75,004

• 136,690

UTF-8 is the most common encoding system on the web for Unicode. What does UTF stand for?

• Universal Text Format

• Unicode Transformation Format

• Unicode Text Free

• Use The Force

What is meant by the term 'character set'? (Choose two)

• The characters that are recognised by a computer.

• Each character is represented by a unique binary number.

• It only refers to ASCII.

• It must be represented using 7 bits.