Physics Electronics MDCAT 2000
PMDC Verified Question 494 of 494
In a standard current-voltage (\( \text{I-V} \)) characteristic plot of a \( \text{P-N} \) junction diode, the forward-bias conduction region is located in:

+V-V+I-IV_knee
A
The first quadrant (positive voltage and positive current)
B
The second quadrant (negative voltage and positive current)
C
The third quadrant (negative voltage and negative current)
D
The fourth quadrant (positive voltage and negative current)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: The first quadrant (positive voltage and positive current)
Concept:

Under forward bias, a positive voltage applied to the anode results in a positive forward current from anode to cathode.

Formula:

$$V_f > 0, \quad I_f > 0 \implies (V_f, I_f) \in \text{Quadrant I}$$

Solution:

  • The horizontal axis represents applied voltage (\( +V \) to the right, \( -V \) to the left).


  • The vertical axis represents diode current (\( +I \) upward, \( -I \) downward).


  • Because forward bias corresponds to positive voltage (\( +V \)) and positive current (\( +I \)), the forward conduction curve lies in the first quadrant.


Why other options are incorrect:

  • Option B: The second quadrant (\( -V, +I \)) would represent power generation, which does not occur in passive diodes.
  • Option C: The third quadrant (\( -V, -I \)) represents reverse-bias leakage and breakdown.
  • Option D: The fourth quadrant (\( +V, -I \)) is non-physical for passive semiconductor diodes.

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.

Previous Question All Electronics MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App