If VA and VB are the input voltages (either 5V or 0V) and V0 is the… | JEE Main 2021 (31 Aug, Shift 2)

Q136JEE Main 2021 · 31 AUG · SHIFT 2Medium

Logic Gates

If VA and VB are the input voltages (either 5V or 0V) and V0 is the output voltage then the two gates represented in the following circuit (A) and (B) are :-

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Answer: (b)

Circuit (A): if either $V_A$ or $V_B$ is 5 V, that diode conducts and $V_0 \approx 5$ V; only when both are 0 V is $V_0 = 0$ . This is OR.
Circuit (B): $V_B = 5$ V drives the npn transistor into saturation, so $V_0 \approx 0$ ; $V_B = 0$ cuts it off, so $V_0 = 5$ V. This is NOT.
So the answer is (b) OR and NOT Gate.

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