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25. 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 is

(a) π D2 σ

(b) 2 π D2 σ

(c) 3 π D2 σ

(d) 4 π D2 σ

Ans. b

(4)

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(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (118)

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