Which one of the following would a hydrogen balloon find easiest to lift :-

one kg of steel

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one kg of lightly packed feathers

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one kg of water

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all the same

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Solution

The correct option is B one kg of lightly packed feathers
Feathers have lower density as compared to steel and water. Hence one kg of water occupies more volume as compared to other materials and hence the buoyant force acting on them upwards is more.
Thus one kg of lightly packed feathers are easiest to lift.

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