7. Coatings used on raincoat are waterproof becauseFlame Institute

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7. Coatings used on raincoat are waterproof because

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 (10)

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 coating (d) Angle of contact decreases Ans. b (15)

7. Coatings used on raincoat are waterproof because

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