1. A liquid does not wet the sides of a solid, if the angle of contact is
(a) Zero
(b) Obtuse (More than 90°)
(c) Acute (Less than 90°)
(d) 90°
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a