Assertion :A raindrop after falling through some height attains a constant velocity. Reason: At constant velocity, the viscous drag is just equal to its weight.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Gravity does cause things to fall with increasing speed, but as they speed up viscous force due to air increases. Eventually the viscous force due to air is enough to balance the force of gravity, so the acceleration stops and the raindrop reaches a constant terminal velocity. So correct choice is A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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