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Statement I: A hydrogen-filled balloon s...

Statement I: A hydrogen-filled balloon stops rising after it has attained a certain height in the sky.
Statement II: The atmospheric pressure decreases with height and becomes zero when the maximum height is attained.

A

both Assertion and Reason are true and the Reason in the correct explanation of the Assertion.

B

both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.

C

Assertion is true but the Reason is false.

D

both Assertion and Reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
A hydrogen filled balloon sttops rising in the sky after attaining a height where the weight of balloon is balanced by the upward thrust due to air on balloon. Thus, Assertion is correct. Here Reason is also correct but can not explain the Assertion.
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