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Doctors Medicines MCQs Q&A

  1. a and b
  2. a, b and c
  3. a, c and d
  4. All of the above
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1 Answers

Option 3 : a, c and d

The correct answer is option 3 i.e a, c and d.

Concept:

  • Latent Heat is an amount of heat absorbed by a unit mass of the substance to change its state without change of temperature. Hence statement 'a' is correct and the statement 'b' is wrong. 
  • The S.I. unit of Latent heat is Joules per kilogram. Hence statement 'c' is correct. 
  • Latent heat is used up in overcoming the force of attraction between the molecules of the substance. Hence statement 'd' is correct. 
  • For e.g - Latent heat of fusion and latent heat of vaporization involved in phase changes, i.e. a substance condensing or vaporizing at a specified temperature and pressure.

  • Latent heat of vaporization: It is the heat energy required to change 1 kg of the material in its liquid state at its boiling point to 1 kg of the material in its gaseous state.
    • It is also the amount of heat energy released when 1 kg of vapour changes into 1 kg of liquid.
  • Latent heat of fusion: It is the heat energy required to change 1 kg of the material in its solid state at its melting point to 1 kg of the material in its liquid state.
    • It is also the amount of heat energy released when at melting point 1 kg of liquid changes to 1 kg of solid.
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