Given pictures show the method of removing _____________ water from the Earth's surface.

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Fig. 4.62 shows a point source P inside a water container. Three rays A, B and C starting from the source P are shown up to the water surface.
(a) Show in the diagram the path of these rays after striking the water surface. The critical angle for water-air surface is $48^{\circ}$ .
(b) Name the phenomenon which the rays A, B and C exhibit.

Which of the following is a suitable method of removing hardness from water?

Q. The earth is assumed to be a sphere a radius

R .

A platform is arranged at a height

R

from the surface of the earth. The escape velocity of a body from this platform is

f v_{s}

where

v_{s}

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is :-

Q. Which of the following is not a method of removing impurities from a colloidal sol?

The diagram shows a point source A inside a liquid container. Four rays P, Q, R and S starting from A are shown up to the water surface. Which of the following ray(s) will reflected inside the liquid?

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