Physics
Rainbows are produced when sunlight :

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

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

The sea is wider than the river
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

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Physics
In a bipolar junction transistor

All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The base has the least concentration of impurity
The emitter has the least concentration of impurity
The collector has the least concentration of impurity

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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They emit light of a constant intensity
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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