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Which logic gate with inputs A and B performs the same operation as that performed by the following circuit? [Figure: a battery V and a lamp in a loop; in the top wire two switches A and B are connected in parallel.]

Asked in JEE Main Online 2012 · Waveforms, switches and diode gates

Figure: Waveforms, switches and diode gates
Answer: (2) OR gate

Step-by-step solution

The switches are in parallel, so closing either one completes the circuit.

The lamp lights for A=1 or B=1: OR.

Why the other options are wrong

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