Basic General Knowledge
Primary rainbow is formed when light suffers

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

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Basic General Knowledge
What is the function of a dynamo?

To convert mechanical energy into electrical energy
To convert heat energy into light energy
To convert light energy into heat energy
To convert electrical energy into mechanical energy

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