NDA 2022 Physics question

The specific latent heat of vaporization of a substance is the quantity of heat needed to change unit mass from

(A)liquid to vapour with a change of temperature
(B)liquid to vapour without a change of temperatureCorrect
(C)vapour to liquid without a change of temperature
(D)vapour to liquid with a change of temperature

Answer: (B)

Solution

During a change of state the temperature stays constant and the heat supplied is used to change the state. The specific latent heat of vaporization is the heat needed to change unit mass of a liquid into

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Question ID VK-032043