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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

(3)

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