NEET UG 2019 · Physics · Question 39
NEET 2019 Physics, question 39
Question 39 of the NEET 2019 paper (code P1) is a Physics question from Semiconductor Electronics: Materials, Devices and Simple Circuits. Its idea, Electrical Switch Circuit Analogies, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q39 · Physics
[Circuit diagram: switches A and B with LED (Y)]
The correct Boolean operation represented by the circuit diagram drawn is :
The figure, described in words
+6 V through resistor R to a node feeding LED (Y); the node goes through a second R to ground; switches A and B (positions 0/1) connected in series between the node and ground.
- 1AND
- 2OR
- 3NANDOfficial answer
- 4NOR
Official answer: option 3 · NTA final answer key
Same idea
The only question on Electrical Switch Circuit Analogies
No other NEET paper from 2017–2026 tested this exact idea.
Electrical Switch Circuit Analogies: every question and how it was framed
The chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits in ten years of NEET
27 questions from 2017–2026, asked in 10 of 10 papers, about 2.6 a paper. Logic Gates alone had 10.