16. If the surface tension of a liquid is T, the gain in surface energy for an increase in liquid surface by A is
(a) AT-1
(b) AT
(c) A2T
(d) A2T2
Ans. b
(6)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)