Assertion :The universal gravitational constant is the same as acceleration due to gravity Reason: Gravitational constant and acceleration due to gravity have the same units

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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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
The gravitational constant $(G)$ is the proportionality constant of the Newton's gravitational law. The acceleration $(g)$ due to gravity is the gravitational field at earth's surface.
Thus, both $G$ and $g$ can not be same quantity.
The SI unit of $G$ is $N . m^{2} / k g^{2}$ and of $g$ is $m / s^{2}$ .
Thus, both $G$ and $g$ can not have same unit.
Hence, both assertion and reason are incorrect.

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