Physics Electronics UHS 2022
PMDC Verified Question 459 of 494
When the temperature of semiconductor suddenly drops to zero kelvin, then a semiconductor acts as:
A
Super conductor
B
Semi-conductor
C
Conductor
D
Insulator
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Insulator
Concept:

The electrical conductivity of intrinsic semiconductors is highly temperature-dependent. Thermal energy is required to break covalent bonds and excite electrons from the valence band to the conduction band.

Solution:

  • At Absolute Zero (\( 0\text{ K} \)), there is zero thermal energy available in the lattice.


  • Consequently, no covalent bonds are broken, and absolutely no electrons can cross the bandgap into the conduction band.


  • With zero free electrons and zero holes, the material has infinite resistivity. Therefore, it acts perfectly as an insulator.


Why other options are incorrect:

  • Conductor / Super conductor: Conductivity drops to zero at \( 0\text{ K} \) for semiconductors, unlike metals which become better conductors or superconductors at ultra-low temperatures.


  • Semi-conductor: At \( 0\text{ K} \), it loses its defining semi-conductive property and behaves purely as an insulator.

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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