Question

A drop of water is always spherical due to:
$\left( a \right)$ Viscosity
$\left( b \right)$ Surface tension
$\left( c \right)$ Atmospheric Pressure
$\left( d \right)$ Gravity

Answer 1

Using the idea in this problem that the binding force between the molecules of water helps to change the shape so that the surface tension can be reduced to a minimum. Sphere is a form that helps to do so, this definition should provide the right response to this statement about the issue.

Complete step-by-step answer :
Owing to the surface tension of water which is induced by the tendency of water molecules to bind together, raindrops take on the spherical shape.
The spherical shape has the least possible surface area due to which it can resist any of the atmospheric external forces.
The superficial tension is responsible for the unified forces between liquid molecules.
The surface molecules of water don't have molecules like those around it.
And due to unified forces, the water droplets appear to be drawn into spherical form.
Hence, water drop is still spherical.
So that's the response they need.
So overall we can say that surface tension is the reason to bind the force between the molecules of water or rain drops such that the rain drops remain in spherical shape (i.e. least possible shape a raindrop can be taken when it is freely falling or a drop of water rest on any smooth surface).
So surface tension is the required answer.
So this is the required answer.
Hence the correct answer is option (B).

Note :The intermolecular forces at the interface influence the surface tension greatly. Surface stress often depends on the temperature, surrounding and liquid nature. The magnitude of intermolecular forces will be greater the more the surface tension will be.