List of top Geography Questions on Ground water hydrology

In the context of the effect of drainage density on the run-off generation and the hydrograph at the catchment outlet, all other factors remaining the same, pick one or more CORRECT statement(s):
 

Find the correct statement/s.
(A) Hardness of water is due to the presence of calcium and magnesium salt.
(B)Permanent hardness of water can not be removed by boiling of water.
(C) Lime can also be used to remove the hardness of water.
(D) Hard water forms scum with soap.
(E) Rain water is not always hard water.
Choose the correct answer from the options given below:
The highest proportion of the total water is used in the country in _____ sector.