13. A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is
(a) Flat
(b) Concave
(c) Convex
(d) Cylindrical
Ans. b
(7)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)