ANS:A - pseudoplastic

Rubber latex is an example of a pseudoplastic fluid. Here’s why:

• Pseudoplastic Fluid: Pseudoplastic fluids, also known as shear-thinning fluids, are fluids whose viscosity decreases with increasing shear rate. In other words, as the fluid is subjected to higher rates of shear stress (such as during stirring or flowing through a pipe), its viscosity decreases, allowing it to flow more easily. Rubber latex exhibits this behavior—it becomes less viscous and flows more readily when agitated or processed.
• Bingham Plastic: Bingham plastics require a minimum stress, called the yield stress, to start flowing. Rubber latex does not exhibit this behavior; it flows continuously without a yield stress.
• Dilatant: Dilatant fluids, or shear-thickening fluids, increase in viscosity with increasing shear rate, which is the opposite behavior of rubber latex.
• Newtonian: Newtonian fluids have a constant viscosity regardless of the shear rate. Water is an example of a Newtonian fluid.