Physics
In an optical fibre the signal is transmitted

In a curved path
In a straight line path
Due to total internal reflection
Due to refraction

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

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