GS PrelimsScience and TechnologyGeneral Science1997

The tendency of a liquid drop to contract and occupy minimum area is due to

viscosity

surface tension

density

vapour pressure

Correct Answer: Option B

Explanation

1. The cohesive forces between liquid molecules are responsible for the phenomenon of surface tension. 2. Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible. 3. This tendency causes a liquid drop to assume a spherical shape (which has the minimum surface area for a given volume) and contract. 4. Viscosity relates to resistance to flow. 5. Density is mass per unit volume. 6. Vapour pressure relates to the tendency to evaporate.

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