Physics Current Electricity KU 2024
PMDC Verified Question 9 of 112
For metals, the temperature coefficient of resistance is:
A
Infinity
B
Negative
C
Positive
D
Zero
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Positive
Concept:

Thermal kinetics affect free charge carriers in different lattices differently.

Solution:

  • In standard metals, heating them causes lattice ions to vibrate violently.


  • This vibration blocks the path of drifting electrons, increasing the resistance.


  • Because Resistance increases as Temperature increases, the mathematical fraction (\(\Delta R / \Delta T\)) is heavily Positive.


Why other options are incorrect:

  • Opt B: True for semiconductors, not metals.


  • Opt D: True for highly specialized alloys like constantan, not general metals.

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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