Assertion (A): The resistance of an intrinsic semiconductor ...

CBSE Class 12 Physics 2023 All Sets Paper

Question : 16 of 18

Marks: +1, -0

Assertion (A): The resistance of an intrinsic semiconductor decreases
with increase in its temperature.
Reason (R): The number of conduction electrons as well as hole increase in an intrinsic semiconductor with rise in its temperature.

Both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A).
Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
Assertion (A) is true and Reason (R) is false.
Assertion (A) is false and Reason (R) is also false.

Solution:

The increases in the number at charge carrier does not necessary mean an increase in both electron and holes. In fact, the number of electron and holes many increase or decrease depending on the material and the temperature range.

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