) CASE STUDY BASED QUESTION ANY FOUR (1X4=4) Evaporation is a process by which water converts to water vapour at temperatures below its boiling point. During evaporation only the surface molecules will absorb heat and increase their kinetic energy to overcome the force of attraction. Evaporation causes cooling effect. Unlike boiling, evaporation depends on various factors like temperature, wind speed, surface area and humidity.
a) Boiling is called as a (1) surface phenomenon (2) bulk phenomenon (3) induction process (4) conduction process
b) Hot tea poured in a saucer cools faster than when kept in cup because of (1) more surface area (2) less surface area (3) more temperature (4) more humidity
c) Evaporation causes cooling effect as (1) latent heat is absorbed during the process (2) kinetic energy is increased (3) latent heat of vaporization is released (4) latent heat of fusion is absorbed
d) The rate of evaporation (1) increases with increase in humidity (2) decreases with decrease in humidity (3) doesn't change with humidity. (4) increases with decrease in humidity.
e) Wind speed and rate of evaporation are (1) directly proportional to each other (2) inversly proportional to each other (3) have no relation with each other (4) none of the above
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a》2. Bulk phenomenon
b》1. More surface area
c》
d》4. Increases with decrease in humidity
e》1. Directly proportional to each other
Sorry I don't know 3rd one. I am completely sure that remaining ones are completely correct. :)
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