Physics
Absolute Zero is defined as

At which liquid Helium boils
At which the volume becomes zero
The temperature at which all molecular motion ceases
At which water boils at 298K

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Physics
What is refractive index ?

None of above
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the product of speed of light in medium and in vacuum.

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