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7. Coatings used on raincoat are waterproof because

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7. Two capillary tubes P and Q are dipped in water. The height of water level in capillary P is 2/3 to the height in Q capillary. The ratio of their diameters is

(a)  2 : 3 (b)  3 : 2 (c)   3 : 4 (d)  4 : 3 Ans. b (12)

7. Coatings used on raincoat are waterproof because

(a)  water is absorbed by the coating (b)  Cohesive force becomes greater (c)   Water is not scattered away by the...
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