Physics
The colour of sky appears blue due to

Reflection
Scattering of shorter wave lengths
Dispersion
Refraction

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Physics
X-rays region lies between

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

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Physics
A transformer

Converts electrical energy into mechanical energy
Converts DC to AC
Is used to decrease or increase AC voltage
Converts AC voltage to D.C. voltage

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