Physics
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A vertical straight line
A circle
A parabola
A horizontal straight line

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Physics
The blue colour of sky is due to

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

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