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

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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)

Decrease in size

(b)

Flatten into a disc-like shape

(c)

Increase in size

(d)

Maintain the same size and shape

(c)

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