A) residual pressure
B) thrust on drop
C) surface tension
D) viscosity
Correct Answer: C
Solution :
Key Idea: Surface area of a sphere is least. The behaviour of liquids is controlled not only by gravitational force (weight) but some other force also acts upon it which depends upon the nature of the surface in contact. If the weight of liquid is negligible then its shape is perfectly spherical. Also we know that for a given volume, the surface area of a sphere is least, hence we may say that the free surface of a liquid has a tendency to contract to a minimum possible area. In this respect it behaves like a stretched elastic membrane which also has a natural tendency to contract. Thus, a liquid surface is always in a state of tension known as surface tension.
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