Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Interference of the sun light from water surface
Refraction of the sun light

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Physics
The term ''equinox' means

When the day and night are of equal duration
The axis of the Earth around which it rotates
The path which the Earthtakes around the Sun
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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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

Jet streams are typically continuous over long distances.
In summer, the polar front jet achieves its maximum force.
It is narrow band of high-velocity wind.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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