42. The work done in blowing a soap bubble of radius 0.2 m is (the surface tension of soap solution being 0.06 N/m)
(a) 192π x 10-4 J (b) 280π x 10-4 J
(c) 200π x 10-3 J (d) None of these
Ans. a
(15)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (126)