Statement-1: The resistivity of a semiconductor decreases with increases of temperature
Statement-2: In a conducting solid, the rate of collision between free electrons and ions increases with the increase of temperature

Statement-1 is true and Statement-2 is correct explanation for Statement-1

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Statement-1 is true and Statement-2 is NOT the correct explanation for Statement-1

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Statement-1 is true, Statement-2 is false

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Statement-1 is false, Statement-2 is true

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Solution

The correct option is B Statement-1 is true and Statement-2 is NOT the correct explanation for Statement-1
Semiconductors has negative temperature coefficient of resistance hence,statement 1 is true.
When temperature of a conductor is increased the energy of electrons and ions also increases. thus the collision between free electrons and ions increases with the increase of temperature. Hence statement 1 is correct and statement 2 is correct but statement 2 is not the correct explanation of statement 1 . so correct option is B

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