Question

In a two-input logic gate, when one input is 1 and the other is 0 the output is 1. But even if both inputs are 0, the output is 1. The logic gate is ______.

Options

• a X-OR gate

• an AND gate

• a NOR gate

• a NAND gate

Answer 1

In a two-input logic gate, when one input is 1 and the other is 0 the output is 1. But even if both inputs are 0, the output is 1. The logic gate is a NAND gate.

Explanation:

According to a given situation, the truth table can be given as,

Input			Output
A	B	AB	`(Y) = overline(AB)`
0	0	0	1
0	1	0	1
1	0	0	1
1	1	1	0

Hence, the given logic gate is the NAND gate.