1. Tardigrade
  2. Question
  3. Physics
  4. <B>Assertion: </B> A pure semiconductor has negative temperature coefficient of resistance. <B>Reason: </B> On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

Q. Assertion : A pure semiconductor has negative temperature coefficient of resistance.
Reason : On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

 3175  221 AIIMSAIIMS 2010Current Electricity Report Error

Solution:

The resistance of semiconductor decreases with a rise in temperature because of negative temperature coefficient of resistance. The reason being, on raising the temperature, more charge carriers are released, conductance increases and resistance decreases.
So, both assertion and reason are correct and reason is the correct explanation of the assertion.