| Column - $\mathrm{I}$ | Column - $\mathrm{II}$ |
| $(a)$ Cohesive force | $(i)$ Useful for writing by chalk on blackboard. |
| $(b)$ Adhesive force | $(ii)$ Useful in soldering. |
| $(iii)$Useful for formation of spherical drops of liquid. |
$(A)$ the net elongation of the spring is $\frac{4 \pi R^3 \rho g}{3 k}$
$(B)$ the net elongation of the spring is $\frac{8 \pi R^3 \rho g}{3 k}$
$(C)$ the light sphere is partially submerged.
$(D)$ the light sphere is completely submerged.

(The coefficient of viscosity of water is $9.8 \times 10^{-6}$ $\left.\mathrm{N} \mathrm{s} / \mathrm{m}^2\right)$