1.

The weight of a ballon is W_(1) when empty and W_(2) when filled with air. Both are weighed in air by the same sensitive spring balance and under identical conditions.

Answer»

`W_(1)ltW_(2)`, as the weight of air in the BALLOON is offset by the FORCE of buoyancy on it
`W_(2)ltW_(1)` due to the force of buoyancy acting on the filled balloon
`W_(2)ltW_(1)`, as the air inside is at a greater pressure and hence has greater density that the air outside
`W_(2)=W_(1)+` weight of the air inside it

Answer :A


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