Physics
The ordinary and maximum tolerance limit of sound by human being is

60 db to 80 db (decibel)
65 db to 75 db (decibel)
70 db to 85 db (decibel)
50 db to 70 db (decibel)

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Physics
'Mirage' is an example of

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

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Physics
The term ''equinox' means

The axis of the Earth around which it rotates
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
When the day and night are of equal duration
The path which the Earthtakes around the Sun

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