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A hydrogen-inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will

A hydrogen-inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will:

(a)

Decrease in size

(b)

Flatten into a disc-like shape

(c)

Increase in size

(d)

Maintain the same size and shape

Answer:

(c)

Moderate

Explanation

As the balloon rises, it increases in size due to lower external pressure. Hence, (c) is correct.