30. The excess pressure in a soap bubble is thrice that in other one. Then the ratio of their volume is
(a) 1 : 3
(b) 1 : 9
(c) 27 : 1
(d) 1 : 27
Ans. d
(5)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)