Basic General Knowledge
Primary rainbow is formed when light suffers

either one or two internal refractions before emerging out of the drop
one internal refractions before emerging out of the drop
two internal refractions before emerging out of the drop
no internal refraction

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Basic General Knowledge
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

on a cloudy night the clouds are warm and therefore retard the cooling
current of air carry the heat away from the earth on a clear night
the clear sky allows radiant energy to escape readily from the earth
the clear sky allows the cold of outer space to reach the earth

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