NIMCET 2025 — Computer PYQ
NIMCET | Computer | 2025Which of the following statements about ASCII and Unicode is correct?
Choose the correct answer:
- A.
ASCII uses 16 bits per character, while Unicode uses only 7 bits.
- B.
Unicode is backward compatible with ASCII and includes all ASCII characters in its encoding.
(Correct Answer) - C.
Unicode and ASCII are completely different and share no common characters.
- D.
ASCII can represent more characters than Unicode because it uses fewer bits per character.
Unicode is backward compatible with ASCII and includes all ASCII characters in its encoding.
Explanation
Solution
Correct Option: (C) Unicode is backward compatible with ASCII and includes all ASCII characters in its encoding.
Logic Check
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Backward Compatibility:
Unicode was designed to be compatible with existing ASCII systems. In the UTF-8 encoding, the first 128 characters (0 to 127) are exactly the same as the ASCII character set.
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Inclusion:
Since Unicode reserves its first 7 bits of mapping for ASCII, any valid ASCII text file is also a valid UTF-8 encoded Unicode file.
ASCII Value of ’A’=65=(01000001)2UTF-8 Value of ’A’=65=(01000001)2 -
Expansion:
While ASCII is limited to 27 characters, Unicode expands this using variable-length encoding to cover over 1,000,000 possible code points for global languages and symbols.