Correct option is B
Paper pulp is considered a pseudoplastic fluid. Pseudoplastic fluids exhibit shear-thinning behavior, meaning their viscosity decreases with an increase in shear rate. When subjected to shear forces (like stirring or pumping), the fluid becomes less viscous and flows more easily. This behavior is typical in materials like paper pulp, ketchup, and paints, where the fluid needs to flow under force but retain some consistency when at rest.
In contrast:
- Dilatant fluids increase in viscosity with an increase in shear rate.
- Newtonian fluids have a constant viscosity, regardless of the shear rate.
- Bingham plastic fluids require a yield stress to start flowing and then behave like a viscous fluid.
Thus, paper pulp is best described as a pseudoplastic fluid due to its shear-thinning properties.
