Question

Tooth paste is an example of ————— flui(D)

• A. Newtonian
• B. Power law
• C. Bingham plastic
• D. Pseudo plastic

Hint:

Bingham plastic fluids need an initial stress (yield stress) before they begin to flow, making them behave like solids under low stress and like liquids under higher stress.

Answer 1

The Correct Option is C

Toothpaste exhibits characteristics of Bingham plastic fluids, which behave like a solid until a certain yield stress is applied, and then flow like a viscous flui(D) This property is common for materials like toothpaste, paints, and chocolate. 
Conclusion: Toothpaste is a Bingham plastic fluid because it shows both solid and liquid characteristics depending on the applied stress.