Physics
Sprayer functions on

Floatation principle
Archemede's principle
Pascal's law
Bernouli's principle

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

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

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Physics
Planets do not twinkle because

They emit light of a constant intensity
Their distance from the earth does not change with time
They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.

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