Physics
It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

Nail exerts more pressure than needle on the balloon.
Gas is reactive with the needle.
Nail is more longer than needle.
Needle exerts more pressure than nail on the balloon.

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Physics
Hydro-electric power is a:

Renewable natural resource
non-renewable natural resource
A mixture of renewable and non-renewable natural resource
Neither renewable nor non renewable resource

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Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them
The forces of cohesion are very large
The forces of adhesion are large

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