A. only when the fluid is frictionless
B. only when the fluid is incompressible and has zero viscosity
C. when there is no motion of one fluid layer relative to an adjacent layer
D. irrespective of the motion of one fluid layer relative to an adjacent layer
E. in case of an ideal fluid
Correct Answer: when there is no motion of one fluid layer relative to an adjacent layer ✔
Last Updated: May 18, 2023