Physics
The oil in the wick of lamp rises due to

Force of cohesion
Pressure difference
Low viscosity of oil
Pheonomenon of capillarity

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure of a person increases at high altitudes
The blood pressure fluctuates and finally decreases drastically
The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure

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

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