Physics
When a ship enters the sea from a river

It remains at the same level
It sinks a little
It rises or sinks depending on the material it is made of
It rises a little

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Physics
The term ''equinox' means

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 axis of the Earth around which it rotates
The path which the Earthtakes around the Sun

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Physics
'Mirage' is an example of

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

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