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NDA 2 2025 GAT, question 64

Topic: Physics

Q64

The quantity of heat needed to change unit mass of a substance from liquid to vapour without changing the temperature, is called

  1. (a) specific heat
  2. (b) specific latent heatCorrect answer
  3. (c) thermal capacity
  4. (d) heat energy

Solution.

Answer: (b) specific latent heat

  1. Specific latent heat of vaporisation is heat required per unit mass for the liquid-to-vapour change at constant temperature: L=Q/m.
  2. Its unit is J/kg.
  3. Specific heat instead concerns changing temperature without a phase change.