Physics Electronics NUMS 2022
PMDC Verified Question 468 of 494
A device that converts AC into DC is called:
A
Diode
B
Capacitor
C
Transistor
D
Inductor
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Diode
Concept:

Converting AC to DC fundamentally requires a one-way electrical valve.

Solution:

  • A P-N junction diode is explicitly designed to conduct current easily in one direction (forward bias) and block it in the other (reverse bias).


  • When an AC signal is applied, the diode strips away one half of the waveform, executing the core task of rectification (AC to DC).


Why other options are incorrect:

  • Capacitor: Stores charge, smooths DC, but cannot rectify.


  • Inductor: Opposes changes in current, cannot rectify.


  • Transistor: Used to amplify or switch signals.

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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