Physics Current Electricity UHS 2024
PMDC Verified Question 13 of 112
The resistance of semi-conductor with rise in temperature:
A
Increases
B
Decreases
C
Remain same
D
Infinite
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Decreases
Concept:

Semiconductors have a negative temperature coefficient due to band-gap mechanics.

Solution:

  • At absolute zero, a pure semiconductor acts as a perfect insulator.


  • As temperature rises, thermal energy excites electrons from the valence band into the conduction band.


  • This massive influx of available charge carriers (electrons and holes) vastly overpowers any increased scattering from atomic vibrations.


  • Consequently, the overall resistance decreases significantly.


Why other options are incorrect:

  • Opt A: Metals increase resistance with temperature.


  • Opt C & D: Incorrect physical behavior.

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.

Previous Question All Current Electricity MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App