Question

GIVE REASONS i) Temperature of Liquid does not change when it boils (ii) Doctors advised to put strips of wet clothes on the forehead of a person having high temperature (iii) A liquid generally flows easily

Answer 1

(i) A liquid generally flows easily.

Ans :- The intermolecular Forces in a liquid are weak. It's molecules are able to slide over one another and liquid generally flows easily.

(ii)Ice at 0 C appears colder to the mouth that water at 0. Why?

Ans:- Latent heat of fusion of ice is quite high. In the mouth, ice absorbs this heat and melts. That is why ice at 0°C gives more cooling sensation in the mouth than water at the same temperature.

(iii)Doctor advise to put strips
of a wet cloth on the forehead of a person having high temperature

Ans :- As water evaporates from the strips of wet cloth placed on the forehead of a person, it absorbs heat from the body. The body temperature gets lowered and the person gets some relief from fever.


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Answer 2

i) At the boiling temperature, adding heat energyconverts the liquid into a gas WITHOUT RAISING THE TEMPERATURE.

ii) When strips of wet cloth are put on the forehead of person having fever, the water in the cloth absorbs heat . it  helps to decrease the extra heat in the body caused due to high fever.

iii) water flow easily because of the intermolecular spaces .

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