28. If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because
(a) Angle of contact is acute
(b) Cohesion force is more
(c) Adhesion force is more
(d) Density of mercury is more
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a