Which logic gate with inputs $\mathrm{A}$ and $\mathrm{B}$ performs the same operation as that performed by the following circuit?

• A

  NAND gate
• Correct answer
  B

  OR gate
• C

  NOR gate
• D

  AND gate

Solution

When either of $A$ or $B$ is 1 i.e. closed then lamp will glow. In this case, Truth table

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