20. If the radius of a soap bubble is four times that of another, then the ratio of their pressures will be
(a) 1 : 4
(b) 4 : 1
(c) 16 : 1
(d) 1 : 16
Ans. a
(7)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)