Physics Current Electricity NUMS 2022
PMDC Verified Question 74 of 112
The resistance of pure metal increases with:
A
Increase in temperature
B
Increase in pressure
C
Decrease in temperature
D
Decrease in pressure
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Increase in temperature
Concept:

Pure metals have a positive temperature coefficient of resistance.

Solution:

  • As temperature increases, the kinetic energy of the metal lattice ions increases.


  • This causes larger thermal vibrations, which increases the frequency of collisions between the free electrons and the ions.


  • More collisions mean a shorter mean free path, thereby increasing resistance.


Why other options are incorrect:

  • Opt C: Decreasing temperature lowers resistance.


  • Opt B & D: Everyday atmospheric pressure changes have negligible effects on standard metallic resistance.

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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