A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from jar is pumped out?

The balloon will sink.

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The balloon will expands.

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The balloon remains same

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None of the above are correct

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Solution

The correct option is A The balloon will sink.
The balloon will sink.
Explanation: As air is pumped out from jar, the density of air in jar decreases, so the upthrust on balloon decreases. As weight of balloon exceeds upthrust on it, it sinks.

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