Question

The output of the two-input OR gate is high

• A. Only if both inputs are high
• B. Only if both inputs are low
• C. Only if one input is high and the other is low
• D. If at least one of the inputs is high

Hint:

For an OR gate, the output is high if at least one input is high — remember “O” in OR for “One or more”.

Answer 1

The Correct Option is D

An OR gate gives a high output (logic 1) if any one or both of its inputs are high.
The only time an OR gate outputs low (logic 0) is when both inputs are low.
Truth table for a two-input OR gate: