Physics
A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

Disk
Sphere
Depends on their masses
Both reach at the same time

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Physics
A hydrogen balloon floats up because of

The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in height
Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in weight

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