23. The amount of work done in forming a soap film of
size 10 cm x 10 cm is (Surface tension T= 3 x 10-2 Nm
(a)6 x 10-4 j
(b) 3 x 10-4 j
(c) 6 x 10-3 j
d) 3 x 10-4 j
Ans. a
(10)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (126)