Physics Electronics PMDC Conceptual Practice
PMDC Verified Question 62 of 494
In a \( \text{P-type} \) semiconductor crystal at room temperature, the minority charge carriers are:
A
Holes
B
Positrons
C
Electrons
D
Protons
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Electrons
Concept:

In a P-type material, holes are the majority carriers supplied by acceptor dopants, whereas electrons are minority carriers generated strictly by thermal agitation.

Formula:

$$n_h \gg n_e \quad (\text{in P-type material})$$

Solution:

  • Thermal energy breaks a small number of covalent bonds, producing electron-hole pairs.


  • The resulting free electrons constitute the minority charge carriers in P-type semiconductors.


Why other options are incorrect:

  • Option A: Holes are the majority charge carriers in P-type material.


  • Option B: Positrons are antimatter particles, not solid-state charge carriers.


  • Option D: Protons are bound inside atomic nuclei and do not act as mobile charge carriers.

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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