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Assertion: Resistivity of conductor and semiconductors increases with temperature. Reason: The electrons move with more kinetic energy and hence relaxation time decreases.

Options

  1. AIf both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
  2. BIf both Assertion and Reason are true but Reason is not explanation of the Assertion.
  3. CIf Assertion is true but the Reason is false.
  4. DIf Assertion is false but Reason is true.

Correct answer

D. If Assertion is false but Reason is true.

Step-by-step solution

Resistivity of conductor increases and that of semiconductors decreases with temperature. Higher kinetic energy of electrons refer to higher number collisions per unit time. So, Assertion is false but Reason is true.

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