Question

The spherical shape of rain-drop is due to :-

• A. density of the liquid
• B. surface tension
• C. atmospheric pressure
• D. gravity

Answer 1

Answer: (B)

surface tension

We all know that for a given volume of a liquid, a sphere has the least surface area. Also, the more the surface area of an object, the more is its surface energy.

Now, to remain in stable equilibrium, a body always tries to minimize its surface energy. Therefore it tries to reduce its surface area and hence acquires a spherical shape.

All this phenomena is because of the presence of surface tension of a fluid.