Physics Electronics MDCAT 2018
PMDC Verified Question 479 of 494
In case of half rectification, resistance of diode during negative half of A.C is:
A
Very low
B
A few ohms
C
Very high
D
Negligible
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Very high
Concept:

A diode acts as a one-way valve for electrical current based on its biasing.

Solution:

  • During the positive half cycle of an AC input, the diode is forward-biased, offering very low resistance (ideal: zero).


  • During the negative half cycle, the polarity reverses, and the diode becomes reverse-biased.


  • In a reverse-biased state, the depletion region widens, resulting in a very high resistance (ideal: infinite) which blocks current flow, effectively creating the half-wave rectification.


Why other options are incorrect:

  • Very low, negligible, or a few ohms describe the forward-biased state, not the negative half (reverse-biased) state.

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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