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

Solar energy
All of these
Wind energy
Hydrogen fuel

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Physics
Rainbow is due to

ionisation of water deposits
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets
refraction and reflection of sunlight by water droplets

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Physics
In a conductor

The valence band and the conduction band overlap each other
The forbidden energy gap is very narrow
The forbidden energy gap is very wide
There is no conduction band

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