In summers water kept in a pitcher is cooler as compared to water kept in a brass vessel but in rainy season water kept in brass vessel is cooler as compared to that in pitcher. Why?

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :

Which of the following changes decrease the vapour pressure of water kept in a sealed vessel ?

A capillary is dipped in water vessel kept on a freely falling lift, then

Indian style of cooling drinking water is to kept it is a pitcher having porous walls water comes to the outer surface very alowly and evaporates .Most of the itself and the water is cooles down .Assums that a pitcher containe 10kg water and 0.2g of water comes from the itomsphere decrease by 5^(@)C specific beat capicity of water = 4200J kg^(-1)^(@)C^(-1) and letent head of vaporization of water = 2.27 xx 10^(6)J kg^(-1)