16. If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is
(a) Acute angle
(b) Obtuse angle
(c) 90°
(d) 0°
Ans. (d) Tangent drawn at point of contact makes 0° with wall of container.
(9)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)