Character Sets

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Character Sets exam questions18 questions with mark schemes and example answers

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What is meant by a character set?: All of the letters, symbols and digits that a computer system can represent
Which term is the name of the standard seven-bit code developed in the 1960s to represent the English alphabet?: ASCII
What is meant by 7-bit ASCII?: A character set that stores each character as a seven-bit code and can represent 128 characters
What is the name for a single letter, digit or symbol that a computer can represent?: Character
What is the name for the unique seven-bit pattern that a computer stores to represent one particular character?: ASCII code
How many different characters can be represented using 7-bit ASCII?: 128 characters
Capital A has the ASCII code 65. What is the ASCII code for capital E?: 69
A standard keyboard needs codes for around 98 different characters. What is the minimum number of bits needed to give each one its own code?: 7
What is a limitation of using 7-bit ASCII to represent characters?: Only 128 different characters can be represented, so some languages cannot be stored
A program inputs the character '7', which is stored using the ASCII code 55. What must the program do to use this value as a number in a calculation?: Convert the character to an integer
The 16-character string 'Computer Science' is stored using 7-bit ASCII. How many bytes are needed to store it?: 14 bytes
The digit 0 has the ASCII code 48. What is the ASCII code for the digit 6?: 54
Why does each character in a character set need its own unique code?: So that any stored code can be decoded back to a single character
A program stores the text AaA using 7-bit ASCII. How many different codes are stored?: Two, because the letters A and a are different characters
A text file contains the symbol # as well as letters and digits. Why can the symbol be stored in the file?: It is a character in the ASCII set with its own code

Character Sets

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