Multiple choice question XXIII — task. Science CBSE, Class 9.

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1. The balloon stops rising up beyond a particular height when the density of gas inside the balloon

exceeds the density of air outside
equal the density of air
becomes less than the density of air
none of these above

2. What of the following is not the application of Archimedes' principle?

designing of ships and submarines.
hydrometers
Lactometers
hydraulic lifts

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