7. If the surface tension of a soap solution is 0.03 MKS units, then the excess of pressure inside a soap bubble of diameter 6 mm over the atmospheric pressure will be
(a) Less than 40 N/m2
(b) Greater than 40 N/m2
(c) Less than 20 N/m2
(d) Greater than 20 N/m2
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a