Read the given statements and select the correct option.
Statement 1: The size of a hydrogen balloon increases as it rises in air.
Statement 2: The material from which the balloon is made can be easily stretched.

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Solution

The atmospheric pressure decreases with altitude. This is because with altitude, the depth of the air column decreases and also the density of the air decreases.

Since, pressure surrounding the balloon at high altitude is lesser than the pressure inside it, its size increases.

The balloon is made of stretchable materials so that it can easily be stretched when the pressure surrounding it decreases.

However, the reason for increase in size of the balloon is not the stretchable material of the balloon but it is the decrease in atmospheric pressure.
Therefore, the correct option is (b).

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Similar questions

What do you interpret from the following:

1.We can easily move our hand in air but not through a solid material.

2.An inflated balloon when kept in a refrigerator gets reduced in its size.

3.A wooden table should be called a solid.

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