Medium
Fill in the blanks:
$(i)$ The cohesive force between the molecules of liquid is more than the adhesive force between the molecules of the plate, then the angle of contact obtained is ...... (acute/obtuse) and the free surface has a shape of ...... (concave/convex).
$(ii)$ The cohesive force between the molecules of liquid is less than the adhesive force between the molecules of the plate, then the angle of contact obtained is ...... (acute/obtuse) and the free surface has a shape of ...... (concave/convex).
$(iii)$ $A$ large pressure is exerted on the surface of a liquid having a shape of .......... (concave/convex).
$(i)$ The cohesive force between the molecules of liquid is more than the adhesive force between the molecules of the plate, then the angle of contact obtained is ...... (acute/obtuse) and the free surface has a shape of ...... (concave/convex).
$(ii)$ The cohesive force between the molecules of liquid is less than the adhesive force between the molecules of the plate, then the angle of contact obtained is ...... (acute/obtuse) and the free surface has a shape of ...... (concave/convex).
$(iii)$ $A$ large pressure is exerted on the surface of a liquid having a shape of .......... (concave/convex).
(D) $(i)$ When cohesive force $ > $ adhesive force, the liquid does not wet the surface. The angle of contact is obtuse $( > 90^{\circ})$ and the meniscus is convex.
$(ii)$ When cohesive force $ < $ adhesive force, the liquid wets the surface. The angle of contact is acute $( < 90^{\circ})$ and the meniscus is concave.
$(iii)$ Due to surface tension, the pressure on the concave side is always greater than the pressure on the convex side. Therefore, a large pressure is exerted on the concave side of the liquid surface.
$(ii)$ When cohesive force $ < $ adhesive force, the liquid wets the surface. The angle of contact is acute $( < 90^{\circ})$ and the meniscus is concave.
$(iii)$ Due to surface tension, the pressure on the concave side is always greater than the pressure on the convex side. Therefore, a large pressure is exerted on the concave side of the liquid surface.
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$(i)$ In incompressible flow,the density of a fluid changes with time and position.
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$(iii)$ In a steady flow,the velocity of the fluid at each point remains identical with time.
Medium
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