Question 3 - Sample Paper 1 by Teachoo - Teachoo Sample Paper

Choose the correct option

"What is the main advantage of using Unicode over ASCII and ISCII encoding schemes?"

A) Unicode can represent more characters than ASCII and ISCII

B) Unicode can represent all the characters of the world languages

C) Unicode can represent both fixed-width and variable-width characters

D) All of the above are correct

Answer:

Answer by student

D) All of the above are correct

Detailed answer by teachoo

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• In this question, we are asked to find out the main advantage of using Unicode over ASCII and ISCII encoding schemes.
• To answer this question, we need to understand some basic concepts about these encoding schemes and how they differ from each other.
• An encoding scheme is a standard way of representing characters as binary codes in a computer system. A character can be a letter, a digit, a symbol, or any other element of a written language.
• Different encoding schemes use different numbers of bits to represent different sets of characters . For example, ASCII uses 7 bits to represent 128 characters, ISCII uses 8 bits to represent 256 characters, and Unicode uses variable numbers of bits to represent over a million characters.
• ASCII stands for American Standard Code for Information Interchange and it is one of the oldest and most widely used encoding schemes. It can represent only English characters and some common symbols and control codes. It uses 7 bits per character, which means it can represent 2^7 = 128 characters in total.
• ISCII stands for Indian Script Code for Information Interchange and it is an extension of ASCII that can represent all the characters of the Indian languages . It uses 8 bits per character, which means it can represent 2^8 = 256 characters in total. It uses the same codes as ASCII for the first 128 characters and uses different codes for the Indian scripts in the remaining 128 characters.
• Unicode is a modern and universal encoding scheme that can represent all the characters of the world languages , including scripts, symbols, emojis, etc. It uses variable numbers of bits per character, which means it can represent more than 2^16 = 65536 characters in total. It has different formats, such as UTF8 and UTF32, that use different numbers of bytes per character. UTF8 uses 1 to 4 bytes per character and UTF32 uses 4 bytes per character.
• The main advantage of using Unicode over ASCII and ISCII encoding schemes is that Unicode can represent more characters than ASCII and ISCII, Unicode can represent all the characters of the world languages, and Unicode can represent both fixed-width and variable-width characters. Therefore, option D) is the correct answer.

So, the correct answer is D) All of the above are correct.

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