Physics Electronics DUHS 2022
PMDC Verified Question 467 of 494
The potential difference applied across a diode to reduce depletion layer is:
A
Junction potential
B
Reverse biasing
C
Forward biasing
D
Biasing voltage
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Forward biasing
Concept:

The depletion layer in a P-N junction acts as a barrier to charge carriers. Applying external voltage (biasing) manipulates the width of this layer.

Solution:

  • When the positive terminal of a battery is connected to the P-type material and the negative terminal to the N-type material, holes and electrons are pushed toward the junction.


  • This external potential opposes the built-in junction potential.


  • As a result, the width of the depletion layer decreases, allowing current to flow. This specific configuration is known as Forward biasing.


Why other options are incorrect:

  • Reverse biasing: Increases the width of the depletion layer.


  • Junction potential: The internal built-in barrier itself, not an externally applied voltage.


  • Biasing voltage: Too generic; could refer to either forward or reverse bias.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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