Directions for Question: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following four responses:
Assertion: A hydrogen filled balloon stops rising after it has attained a certain height in the sky. Reason: The atmospheric pressure decreases with height and becomes zero when maximum height is attained. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.A) If both A and R are true, and R is a correct explanation of the A.
B) If both A and R are true, but R is not a correct explanation of the A.
C) If A is true, but R is false.
D) If both A and R are false.
Correct Answer: B
Solution :
The atmospheric pressure is due to the force exerted by the atmosphere on the region below it. But a hydrogen filled balloon rises up in the atmosphere due to density difference only. As the density of hydrogen gas is less than that of air, the hydrogen filled balloon rises up in the air. But as we know that density of air also keeps on decreasing as we move up, so there will be a point up in the atmosphere where the rising balloon will find that its density is same as that of the surrounding atmosphere. As there is no density difference between the balloon and the atmosphere, the balloon will stop rising.
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