In a two-input AND gate, the output is true only when which condition holds?

In a two-input AND gate, the output is true only when which condition holds?

• A. When any input is high
• B. Only when both inputs are high
• C. When both inputs are low
• D. When inputs are inverted

Answer: (B)

An AND gate requires all inputs to be true for the output to be true. For two inputs, that means both inputs must be high. If either input is low, the output goes low. If both inputs are low, the output is also low. Describing inverted inputs points to a different behavior (inverters or a different gate), not the standard AND operation. So the condition that matches an AND gate’s output being true is: both inputs are high.

An AND gate requires all inputs to be true for the output to be true. For two inputs, that means both inputs must be high. If either input is low, the output goes low. If both inputs are low, the output is also low. Describing inverted inputs points to a different behavior (inverters or a different gate), not the standard AND operation. So the condition that matches an AND gate’s output being true is: both inputs are high.