Physics
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is

Scattering of light
Reflection of light
Dispersion of light
Refraction of light

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is lesser than the density of river water
The sea is wider than the river
The density of sea water is more than the density of river water
The sea is-deeper than the river

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