31. Which of the following is not a type of water infrastructure?
a) Dams
b) Canals
c) Power plants
d) Pipelines
32. What is the name of the process by which water is treated and reused for irrigation and other non-potable uses?
a) Graywater recycling
b) Blackwater recycling
c) Wastewater treatment
d) Water harvesting
33. Which of the following is not a type of water storage facility?
a) Reservoir
b) Aquifer
c) Tank
d) River
34. What is the name of the process by which water is naturally purified as it passes through layers of soil and rock?
a) Filtration
b) Disinfection
c) Distillation
d) Reverse osmosis
35. Which of the following is not a type of water treatment plant?
a) Reverse osmosis plant
b) Desalination plant
c) Wastewater treatment plant
d) Coal-fired power plant
