Physics
The colour of sky appears blue due to

Reflection
Scattering of shorter wave lengths
Dispersion
Refraction

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

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Physics
The term ''equinox' means

The path which the Earthtakes around the Sun
When the day and night are of equal duration
The axis of the Earth around which it rotates
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

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