Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.

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Physics
Hydro-electric power is a:

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

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