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

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

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Physics
The blue colour of sky is due to

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

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