Correct option is C
A static fluid, by definition, cannot support shear stress because there is no relative motion between fluid layers. However, it can support normal stress (pressure). For a static fluid:
- Normal stress refers to the pressure exerted by the fluid in all directions.
- Shear stress in a static fluid is always zero because shear stress arises from velocity gradients, which do not exist in a static fluid.
Thus, the correct answer is that a static fluid can have negative normal stress (which corresponds to pressure) and zero shear stress.
