IGDTUW 2025 — Computer PYQ

The correct answer is (a) EDIC.

Conceptual Breakdown

In computing, "computer codes" (specifically character encoding schemes) are standards used to represent characters, numbers, and symbols in a format that a computer can process. Let's analyze the options:

• (b) ASCII (American Standard Code for Information Interchange): This is one of the most widely used character encoding schemes, representing text in computers and other devices. It typically uses 7 bits to represent 128 unique characters.

• (c) BCD (Binary-Coded Decimal): A system for representing decimal numbers where each digit is represented by its own binary sequence.

• (d) EBCDIC (Extended Binary Coded Decimal Interchange Code): An 8-bit character encoding scheme used primarily on IBM mainframe and midrange computer operating systems.

• (a) EDIC: This is not a standard computer character encoding scheme. It appears to be an incorrect acronym or a distractor option in this context.

Mathematical Representation of Encoding Capacity

The capacity of an encoding scheme can be represented by the number of bits ($n$) used to store characters, which determines the total unique symbols ($S$) available:

$$S=2^n$$

For instance:

• For ASCII (7-bit), the total number of characters represented is:

  $$S_{ASCII}=2^7=128$$

• For EBCDIC (8-bit), the total number of characters represented is:

  $$S_{EBCDIC}=2^8=256$$

Since "EDIC" does not correspond to a recognized standard mapping of binary values to characters, it is the correct answer.