Assertion :A balloon filled with hydrogen stops rising after it has attained a certain height in the sky. Reason: As height increases, density of air decreases resulting in increase of buoyant force.

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 C Assertion is correct but Reason is incorrect
As balloon rises, the density air decreases. As it goes up the buoyancy force or upthrust by surrounding air will decrease due to decrease in density of surrounding air. At some point, weight of balloon will become equal to upthrust and it will stop moving up.
As height increase, density decreases. So buoyant forces decreases .
Assertion is correct and reason is incorrect.

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