27. The work done in increasing the size of a soap film from
10 cm× 6 cm to 10 cm × 11 cm is 3 ×10-4 joule. The surface tension of the film is
(a) 1.5 x 10-2N/m
(b) 3.0 x 10-2N/m
(c) 6.0 x 10-2N/m
(d) 11 x 10-2N/m
Ans. b
(6)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)