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NDA 2 2025 GAT, question 66

Topic: Physics

Q66

Which one of the following statements about surface tension is correct ?

  1. (a) It increases when temperature increases
  2. (b) It decreases when temperature increasesCorrect answer
  3. (c) It will remain same with increase or decrease of temperature
  4. (d) It will always decrease with increase or decrease of temperature

Solution.

Answer: (b) It decreases when temperature increases

  1. For an ordinary pure liquid, surface tension decreases as temperature increases, approaching zero at the critical point.
  2. Increased thermal motion weakens the net cohesive effect at the surface.
  3. Option (b) states this standard trend.