Physics Current Electricity SZABMU 2023
PMDC Verified Question 32 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 behave fundamentally differently from metals when exposed to heat.

Solution:

  • As temperature rises, thermal energy breaks covalent bonds in the semiconductor lattice.


  • This significantly increases the density of free charge carriers (electrons and holes).


  • Because there are vastly more carriers available for conduction, the overall opposition to current drops. Hence, resistance decreases.


Why other options are incorrect:

  • Opt A: This is true for metallic conductors, not semiconductors.


  • Opt C: Resistance changes drastically with temp.

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