Question

The output of OR gate is 1 when

• A. If both inputs are zero \
• B. If either or both inputs are 1 \
• C. Only if both inputs are 1 \
• D. If either input is zero

Hint:

A simple way to remember the function of an OR gate is to think of it as "one or the other or both". As long as there's at least one '1' at the input, the output will be '1'.

Answer 1

The Correct Option is B

Step 1: Recall the truth table for a 2-input OR gate. The output of an OR gate is true (1) if at least one of its inputs is true (1). \begin{center} \begin{tabular}{|c|c|c|} \hline Input A & Input B & Output (A OR B)
\hline 0 & 0 & 0
0 & 1 & 1
1 & 0 & 1
1 & 1 & 1
\hline \end{tabular} \end{center}
Step 2: Analyze the options based on the truth table.

(A) The output is 0 when both inputs are 0. Incorrect.
(B) The output is 1 in the last three rows of the table, which covers cases where either A is 1, B is 1, or both are 1. Correct.
(C) This describes an AND gate. Incorrect.
(D) If one input is 0 and the other is also 0, the output is 0. Incorrect.
The condition that makes the output of an OR gate 1 is when any of its inputs are 1.