36. A mercury drop of radius 1cm is sprayed into

10⁸ drops of equal size. The energy expended in joules is (surface tension of Mercury is 460 x 10^-3N/m

(a)  0.057                                         (b)  5.7

(c) 5.7 x 10^-4 N/m                          (d) 5.7 x 10^-6 N/m

Ans.     a

(11)