# NEET Physics Mechanical Properties of Fluids Questions Solved

A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is $\mathrm{\sigma }$, then change in surface energy is

(a) ${\mathrm{\pi D}}^{2}\mathrm{\sigma }$                          (b) $2{\mathrm{\pi D}}^{2}\mathrm{\sigma }$

(c) $3{\mathrm{\pi D}}^{2}\mathrm{\sigma }$                         (d) $4{\mathrm{\pi D}}^{2}\mathrm{\sigma }$