Physics Electronics UHS 2023
PMDC Verified Question 453 of 494
For the positive half cycle i.e., \( 0 - T/2 \) the diode \( D \):
A
Shows maximum resistance
B
Behaves as open
C
Is reverse biased
D
Is forward biased
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Is forward biased
Concept:

In a standard half-wave rectifier diagram, a single diode is connected in series with the AC source and the load.

Solution:

  • The total time period of the AC wave is \( T \). The first half cycle exists from \( 0 \) to \( T/2 \) and is typically the positive half.


  • During the positive half cycle, the P-region of the diode connects to the positive potential and the N-region to the negative potential.


  • This correctly aligns with the condition for the diode to conduct, meaning it is forward biased.


Why other options are incorrect:

  • Reverse biased, maximum resistance, and behaving as an open circuit all perfectly describe the diode's state during the negative half cycle (\( T/2 \) to \( T \)), not the positive half.

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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