Question

Choose the correct option.
1. The process that involves the change of state from liquid to its gaseous state at any temperature
below its boiling point is called
(a) condensation
(b) evaporation (c) sublimation (d) melting
2. The size of the molecules is of the order of
(a) 10-8 to 10-12 m
(b) 10 to 10-8 m (c) 10 % to 10-15 m (d) 10-8 to 10-10 m
3. On cooling down a substance, there is a loss of heat and the kinetic energy of its molecules
(a) increases
(b) decreases
(c) remains the same (d) none of these​

Answer 1

Explanation:

1- (b):-evaporation

2-(????

3-(b) :-decreases

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Answer 2

1. (b)evaporation
2. size of molecules is diffrent for different molecule of matter
3. decrease (because kinetic energy is directly proportional to temprature)