Question

The seven and eight-bit alphanumeric code that is needed to represent more than 64 characters is called ________.

• A. Card code
• B. ASCII code
• C. IEEE code
• D. Internal code

Hint:

Important Facts: \[ 7\text{-bit ASCII}=128\text{ characters} \] \[ 8\text{-bit Extended ASCII}=256\text{ characters} \] ASCII is one of the most frequently asked character coding standards in examinations.

Answer 1

The Correct Option is B

Concept: Computers store all information in binary form. To represent letters, numbers, and symbols, special coding systems are used. One of the most widely used coding systems is ASCII. \[ \text{ASCII} = \text{American Standard Code for Information Interchange} \] ASCII assigns a unique binary code to each character.

Step 1: Understand why character codes are needed.
A computer understands only binary digits: \[ 0 \quad \text{and} \quad 1 \] Therefore, characters such as A, B, C, 1, 2, 3 and special symbols must be represented using binary codes.

Step 2: Understand ASCII representation.
Standard ASCII uses: \[ 7\text{-bit code} \] which can represent: \[ 2^7 = 128 \] different characters. Extended ASCII uses: \[ 8\text{-bit code} \] which can represent: \[ 2^8 = 256 \] different characters.

Step 3: Compare with the given options.

• Card code – Not a standard character encoding system.
• ASCII code – Standard 7-bit and extended 8-bit character code.
• IEEE code – Related to standards, not character encoding.
• Internal code – Generic term. Thus the correct answer is: \[ \boxed{\text{ASCII Code}} \] Hence, option (B) is correct.