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A sheet can be made water proof by coating it with a substance that changes the angle of contact (a) To ^/2 (b) To zero (c) From acute to obtuse (d) From obtuse to acute

A sheet can be made water proof by coating it with a substance that changes the angle of contact
(a) To ^/2
(b) To zero
(c) From acute to obtuse
(d) From obtuse to acute

Grade:12

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
2 years ago

If the clothes are sprayed with waterproofing agent, then itchanges the angle of contact from acute to obtuse, in this way, water beads up on the surface and does not easily penetrate the clothing.
Vikas TU
14149 Points
2 years ago
If the clothes are sprayed with waterproofing agent, then it changes the  angle of contact from acute to obtuse, in this way, water beads up on the surface and does not easily penetrate the clothing. 

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