Physics
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

moves in opposite direction in which the air is blown
moves in the same direction in which air blows
spins around
does not move

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Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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Physics
In a conductor

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

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