Physics
The sparkling of a diamond is due to

Interference of light
Polarisation of light
Total internal reflection of light
Refraction of light

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Physics
Plants are dried up in winter due to frost because

Evaporation does not take place
Respiration does not take place at low temperature
Photosynthesis does not take place at such low temperature
There is mechanical loss of tissues and drought condition prevails

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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 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

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