31. The surface tension for pure water in a capillary tube experiment is
(a) ρg/2hr
(b) 2/hrρg
(c) rρg/2h
(d) hrρg/2
Ans. d
(14)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)