Physics
Rainbows are produced when sunlight :

Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction

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Physics
'Mirage' is an example of

Total internal reflection of light only
Refraction and total internal reflection of light
Refraction of light only
Dispersion of light only

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Physics
Plants are dried up in winter due to frost because

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

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

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