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20. Surface tension of a soap solution

is 1.9 x 10^-2N/m . Work done in blowing a bubble of 2.0 cm diameter will be

(a) 7.6 x 10^-6 π joule

(b) 15.2 x 10^-6 π joule

(c) 1.9 x 10^-6 π joule

(d) 1 x 10^-4π joule

Ans. b

PrevPrevious20. The rate of steady volume flow of water through a capillary tube of length ‘l’ and radius ‘r’ under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)

Next25. A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is σ, then change in surface energy isNext

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