NEET UG 2020 · Physics · Question 156
NEET 2020 Physics, question 156
Question 156 of the NEET 2020 paper (code E1) is a Physics question from Semiconductor Electronics: Materials, Devices and Simple Circuits. Its idea, Bipolar Junction Transistor, was asked 3 times, in 2017, 2018 and 2020, across NEET 2017–2026. The NTA final answer key gives option 4.
Updated 2026-10-08
Q156 · Physics
For transistor action, which of the following statements is correct ?
- 1Base, emitter and collector regions should have same doping concentrations.
- 2Base, emitter and collector regions should have same size.
- 3Both emitter junction as well as the collector junction are forward biased.
- 4The base region must be very thin and lightly doped.Official answer
Official answer: option 4 · NTA final answer key
Same idea
Bipolar Junction Transistor, in other papers
NEET asked this idea 3 times, in 2017, 2018 and 2020. The other 2 questions below.
- 2018 Q15In the circuit shown in the figure, the input voltage is 20 V, and . The values of , and …Figure-based · Medium
- 2017 Q21In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 k.…Numerical · Medium
Bipolar Junction Transistor: 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. Semiconductor Devices alone had 17.