When a drop of water is dropped on an oil sur | vedclass

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Question

(D) The shape of a liquid drop on a surface is determined by the balance of surface tension forces. When a water drop is placed on an oil surface, the

Vedclass · Accepted Answer

It remains spherical

Vedclass · Answer

(D) The shape of a liquid drop on a surface is determined by the balance of surface tension forces. When a water drop is placed on an oil surface, the surface tension of water $(\gamma_w \approx 72 	imes 10^{-3} 	ext{ N/m})$ is significantly higher than the surface tension of oil $(\gamma_o \approx 20-30 	imes 10^{-3} 	ext{ N/m})$. Because the cohesive forces within the water drop are much stronger than the adhesive forces between the water and the oil, the water drop minimizes its surface area to maintain a spherical shape. Therefore, the correct option is $D$.

Column-$I$	Column-$II$
$(a)$ Cohesive force	$(i)$ Useful for writing by chalk on blackboard.
$(b)$ Adhesive force	$(ii)$ Useful in soldering.
	$(iii)$ Useful for formation of spherical drops of liquid.

When a drop of water is dropped on an oil surface, then:

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Force in Column-$I$ and its use in Column-$II$ are given. Match them appropriately.
Column-$I$ Column-$II$
$(a)$ Cohesive force $(i)$ Useful for writing by chalk on blackboard.
$(b)$ Adhesive force $(ii)$ Useful in soldering.
$(iii)$ Useful for formation of spherical drops of liquid.

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