CBSE Class 12 Physics 2023 Delhi Set 1 Paper

Question : 16 of 35

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:

In semiconductors, as temperature increases, thermally generated electron and hole pair increases and the resistance decreases.
Hence, assertion and reason both are correct and the reason explains the assertion.

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