Physics Electronics PMC 2021
PMDC Verified Question 473 of 494

What is the typical range of the forbidden energy band gap in electrical conductors?
A
100 - 1000 eV
B
0.5 - 10 eV
C
10000 - 10000000 eV
D
0.01 - 0.1 eV
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 0.01 - 0.1 eV
Concept:

Band theory of solids divides materials into conductors, semiconductors, and insulators based on the gap between the valence and conduction bands.

Solution:

In excellent conductors (metals), the valence and conduction bands overlap, meaning the band gap is effectively zero. In certain weak conductors or semi-metals, a very narrow energy gap exists, which typically ranges from 0.01 to 0.1 eV.

Why other options are incorrect:

  • 0.5 to 10 eV describes the band gap of typical semiconductors and insulators.


  • Other extremely high values are physically non-existent for solid-state molecular structures.

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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