1.)Define fluid.
Ans: A fluid is a substance that can't remain at rest under the action of any shear force.
2.)What is nonbarotropic fluid ?
Ans: Fluid such as air for which the density is not a single-valued function of the pressure (aerostatics).
3.)Explain difference between cohesion, adhesion and capillarity ?
Ans: Cohesion is the attraction of like molecules.Adhesion is the attraction of unlike molecules for each other.Capillarity is the elevation or depression of a liquid surface in contact with a solid.
4.)Define surface tension ?
Ans: Surface tension of a liquid is the work that must be done to bring enough molecules from inside the liquid to thesurface to form one new unit area of that surface. (Its unit isNm/m2 or N/m).
5.)What is the difference between perfect and real fluids ?
Ans: Perfect fluids are treated as if all tangential forces created by friction can be ignored. Real fluids refer to the cases in which friction must properly be taken into account.
6.)When the motion of fluid is fully known ?
Ans: The motion of a fluid is fully known when the velocity of each of its particles can be specified.
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