IGDTUW 2026 — Computer PYQ

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Question

IGDTUW 2026 — Computer PYQ

IGDTUW | Computer | 2026

The output of a 2-input OR gate is 0 only when its

Choose the correct answer:

Explanation

The correct option is (d) both inputs are $0$ .

Detailed Solution & Explanation

An OR gate performs a logical addition operation on its inputs. For a 2-input OR gate with inputs $A$ and $B$ , the output $Y$ is expressed mathematically using the Boolean algebraic equation:

$Y = A + B$

Truth Table of a 2-Input OR Gate

The behavior of a standard 2-input OR gate under all possible input combinations is given below:

Input A	Input B	Output Y=A+B
$0$	$0$	$0$
$0$	$1$	$1$
$1$	$0$	$1$
$1$	$1$	$1$

Conclusion:

Looking closely at the truth table, the output $Y$ becomes $0$ (LOW) only and completely when both individual inputs $A$ and $B$ are equal to $0$ . If any of the inputs, or both inputs, are set to $1$ (HIGH), the output stays $1$ .

Therefore, the condition for a 2-input OR gate to produce an output of $0$ is when both inputs are 0.