Question

The terminal velocity of a small sphere settling in a viscous fluid varies as the

• A. Inverse square of the diameter
• B. Inverse of the diameter
  
• C. First power of its diameter
• D. Inverse of the fluid viscosity

Answer 1

The correct option is D Inverse of the fluid viscosity

Terminal velocity of small sphere setting in viscous fluid

$v_t=\frac{g{d}^2({\rho }_s-{\rho }_u)}{18\mu }$

$v_t\propto \frac{1}{\mu }$