Physics
The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is

Dispersion
Diffraction
Reflection
Interference

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Physics
The term ''equinox' means

The path which the Earthtakes around the Sun
When the day and night are of equal duration
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The axis of the Earth around which it rotates

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