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MCQ
A hydrogen-filled balloon rises in air because the upthrust of the air on the balloon is:
Unit-5 Pressure and Deformation in Solids
A greater than the weight of the balloon
B less than the weight of the balloon
C exactly zero
D equal to the density of hydrogen
Explanation

When upthrust exceeds the weight, the net force is upward and the balloon rises (buoyancy in air).

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