[amp_mcq option1=”pressure” option2=”kinematic viscosity” option3=”dynamic viscosity” option4=”surface tension” correct=”option3″]
The correct answer is C. dynamic viscosity.
Pascal-second is the unit of dynamic viscosity, which is a measure of a fluid’s resistance to flow. It is defined as the ratio of the shear stress to the shear rate. The shear stress is the force per unit area that is required to maintain a constant velocity gradient in a fluid. The shear rate is the rate of change of velocity with respect to distance.
Kinematic viscosity is a measure of a fluid’s resistance to flow, but it is independent of density. It is defined as the ratio of dynamic viscosity to density.
Pressure is a measure of the force per unit area that is exerted by a fluid on a surface. It is defined as the force per unit area that is perpendicular to the surface.
Surface tension is the force that acts at the surface of a liquid and tends to minimize the surface area of the liquid. It is caused by the attraction of the molecules in the liquid to each other.