Physics
Oil raise up the wick in a lamp. The principle involves

the diffusion of oil through the wick
volatility of oil
capillary action phenomenon
the liquid state of oil

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Physics
Which one of the following is the correct sequence of passage of light in a compound microscope?

Condenser -Objective lens -Body tube -Eyepiece
Objective lens -Condenser -Body tube -Eye piece
Eyepiece -Objective lens -Body tube -Mirror
Condenser -Objective lens -Eye -piece -Body tube

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.
the friction between sand and feet is more than that between concrete and feet.
the friction between sand and feet is less than that between concrete and feet.

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