Which of the following is false about viscosity?

a. The greater the viscosity, the greater is the opposition to flow.
b. Viscosity is most important under condi-tions of turbulent flow.
c. The stronger the cohesive forces, the greater the viscosity.
d. Fluid viscosity is equivalent to friction between solids.

ANS: B
Laminar flow consists of concentric layers of fluid flowing parallel to the tube wall at velocities that increase toward the center.