We have three beakers A, B and C containing glycerine, water and kerosene respectively. They are stirred vigorously and placed on a table. The liquid which comes to rest at the earliest is

The correct option is Glycerin.

When liquids are stirred vigorously, they acquire kinetic energy and are set into rotational motion. When the stirring is stopped, the internal friction between the different layers of the liquid acts to oppose this relative motion. This internal frictional force within a fluid is known as viscosity.

Viscous force is directly proportional to the coefficient of viscosity of the liquid. The coefficient of viscosity is a measure of a fluid's resistance to gradual deformation by shear or tensile stress (i.e., its "thickness" or resistance to flow).

Among the given liquids (glycerin, water, and kerosene), the coefficients of viscosity vary significantly. Glycerin is highly viscous (thick and sticky) compared to water and kerosene, while kerosene is less viscous than water. The order of viscosity for the three liquids is:
Glycerin > Water > Kerosene

Because glycerin has the highest viscosity, it experiences the greatest internal frictional force (viscous drag) between its layers. This strong resistive force dissipates the kinetic energy of the liquid much faster than in water or kerosene. Consequently, glycerin comes to rest at the earliest.