Physics
If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by

16 times
8 times
2 times
4 times

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Physics
The blue colour of sky is due to

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

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