29. Mercury does not wet glass, wood or iron because
(a) Cohesive force is less than adhesive force
(b) Cohesive force is greater than adhesive force
(c) Angle of contact is less than 90o
(d) Cohesive force is equal to adhesive force
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a