Physics
Which of the following is a renewable resource of energy?

Wind energy
All of these
Hydrogen fuel
Solar energy

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the largest surface area for a given volume
A sphere has the least surface area for a given volume
Intermolecular forces are strong in liquids
Inter molecular forces are weak in liquids

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Physics
A hydrogen balloon floats up because of

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

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