Question

Which of the following is not an example of a Non- Newtonian fluids?

(a) Gels

(b) Water

(c) Suspensions

(d) Pudding

The question was asked in a national level competition.

Question is from Classification of Fluids in division Fluid Flow and Mixing of Bioprocess Engineering

Answer 1

Correct choice is (b) Water

To elaborate: Water is a Newtonian fluid, because it continues to display fluid properties no matter how much it is stirred or mixed. A slightly less rigorous definition is that the drag of a small object being moved slowly through the fluid is proportional to the force applied to the object. (Compare friction). Important fluids, like water as well as most gases, behave – to good approximation – as a Newtonian fluid under normal conditions on Earth.