IGDTUW 2026 — Computer PYQ

The correct option is (a) 2.

Detailed Explanation:

The base or radix of a positional numeral system represents the total number of unique digits or symbols available to represent numbers in that system.

Let's break down the bases of the common positional number systems used in computing:

• Binary System: Has a base (radix) of 2. It utilizes exactly two distinct bits: $0$ and $1$.

• Octal System: Has a base (radix) of 8. It uses digits from $0$ to $7$.

• Decimal System: Has a base (radix) of 10. It is the standard human counting system using digits from $0$ to $9$.

• Hexadecimal System: Has a base (radix) of 16. It uses digits from $0$ to $9$ along with alphabetical symbols from $\text{A}$ to $\text{F}$.

Since the question specifically refers to the binary number system, the base is 2.