Physics
The splitting of white light into its components is due to:

Reflection
Transmission
Refraction
Dispersion

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Physics
The blue colour of sky is due to

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

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure fluctuates and finally decreases drastically
The pressure at high altitudes is greater than that on the plains
The blood pressure of a person increases at high altitudes
The pressure of blood in capillaries is greater than the outside pressure

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