Question

Which one of the following is a typical example of non-newtonian fluid of pseudo plastic variety?
1. Air
2. Water
3. Printing ink
4. ​Milk

Answer 1

Correct Answer - Option 4 : ​Milk

For non-Newtonian fluids the shear stress is given as \(\tau = A{\left( {\frac{{du}}{{dy}}} \right)^n} + B\)

Where A and B are constants depend on the type of fluid and condition of flow.

For pseudo plastic fluids, n < 1 and B = 0. e.g Paper pulp, Rubber solution, Lipsticks, Paints, Blood, Polymetric solutions, Milk etc.