The correct Boolean operation represented by the circuit diagram drawn is :

The correct Boolean operation represented by the circuit diagram drawn is :

switch circuit with +6V, two resistors R, LED(Y), switches A and B

1. AND

2. OR

3. NAND

4. NOR

Doubtly Asked 30 Oct 2026 NEET UG 2019 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 3. NAND

In the circuit the two switches A and B are in series between the LED node and ground. Taking the switch position 1 as closed (logic 1):

If both A and B are 1, the node is connected to ground, so the LED has no voltage and output \(Y=0\).
If either switch is 0, the path to ground is broken, the LED glows and \(Y=1\).

Output is 0 only when both inputs are 1: this is the NAND truth table.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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