Physics
Oil rises up the wick in a lamp because

Of the capillary action phenomenon
Of the surface tension phenomenon
Oil is very light
Of the diffusion of oil through the wick

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Physics
What is refractive index ?

It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
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 product of speed of light in medium and in vacuum.

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Physics
Air moves from the region where the air ________

Humidity is high to the region where the humidity is low
Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high
Pressure is high to the region where the pressure is low

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