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Railways PYQCBT 2 2017

RRB NTPC · Question 59

A liquid drop, contracts because of the attraction of its particles and occupies the smallest possible area. This phenomenon is known as -

  1. Surface Tension

  2. Buoyancy

  3. Cavitation

  4. Viscosity

Show answer & explanation

Answer: (A) Surface Tension

Explanation

The cohesive pull between liquid molecules at the surface makes the surface behave like a stretched film that tries to have the least area. This is surface tension, and it is why drops are spherical.