Question

Find the logic gate, when both the inputs are high the output is low and vice-versa.

• A. AND
• B. OR
• C. NAND
• D. NOR

Hint:

NAND = NOT of AND. It outputs false only when all inputs are true.

Answer 1

The Correct Option is C

A NAND gate gives output LOW only when all inputs are HIGH. Otherwise, the output is HIGH. Truth Table: \[ \begin{array}{c|c|c} A & B & A \text{ NAND } B
\hline 0 & 0 & 1
0 & 1 & 1
1 & 0 & 1
1 & 1 & 0
\end{array} \] This satisfies the condition:
- Both high → output low
- Any input low → output high