Physics
X-rays region lies between

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

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Physics
The blue colour of sky is due to

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

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