• # question_answer The terminal velocity of small sphere falling in a viscous fluid is: A) Proportional to the diameter of the sphereB) Inversely proportional to the viscosity of the fluidC) Inversely proportional to the diameter of the sphereD) Proportional to the density of the fluid.

Terminal velocity of a small sphere falling in a viscous fluid, $v=\frac{{{d}_{2}}({{y}_{s}}-{{y}_{f}})}{18\mu }$