Physics
What is refractive index ?

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

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Weighing will depend on their masses
Both silver and gold pieces weigh equal
The silver piece will weigh more
The gold piece will weigh more

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