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NDA 2 2025 GAT, question 65

Topic: Physics

Q65

The temperature at which “vapour pressure of the liquid in an open vessel becomes equal to the atmospheric pressure” is called

  1. (a) Melting point
  2. (b) Boiling pointCorrect answer
  3. (c) Liquid point
  4. (d) None of the above

Solution.

Answer: (b) Boiling point

  1. Boiling occurs when vapour pressure matches the surrounding pressure, so bubbles can persist throughout the liquid.
  2. In an open vessel the surrounding pressure is atmospheric pressure, defining the boiling point under those conditions.