Physics
The blue colour of sky is due to

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

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Physics
X-rays region lies between

Ultraviolet and visible region
Visible and infra-red region
Gamma-rays and ultraviolet region
Short radio waves and long radio waves

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