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Q20 (CDS-II/2009) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic mechanics concepts Answer Verified

Which one of the following is not result of surface tension?

Result
Your answer: —  Â·  Correct: A
Explanation

Surface tension is the property of a liquid where its surface behaves like a stretched elastic membrane to minimize surface area [t2][t3]. This phenomenon is responsible for the spherical shape of mercury drops, as a sphere has the minimum surface area for a given volume [t2][t3]. It also causes the formation of a meniscus (convex or concave) due to the balance of cohesive and adhesive forces [t1][t5]. Capillary rise is another direct result of surface tension and pressure differences across the curved meniscus [t2][t4]. In contrast, vapour formation (evaporation) is a phase transition process occurring at the surface when molecules gain enough kinetic energy to overcome intermolecular attractions [c1]. While surface tension is related to intermolecular forces, vapour formation is primarily driven by temperature and vapour pressure rather than the elastic tendency of the surface film [c1][c5].

Sources

  1. [1] https://www.usgs.gov/water-science-school/science/water-meniscus
  2. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 7: Particulate Nature of Matter > 7.2.2 Liquid state > p. 105
  3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 24: Hydrological Cycle (Water Cycle) > Factors Affecting Rate of Evaporation > p. 328
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