The output of OR gate is 1 :

• A

  if both inputs are zero
• Correct answer
  B

  if either of both inputs are 1
• C

  only if both inputs are 1
• D

  if either input is zero

Solution

$$ \text { The truth table of OR gate is: } $$

$\therefore 1$ means if either or both inputs are 1.

Hence, the correct answer is option: 'B'.