Water is the only substance present in nature in three forms: solid, liquid and gaseous. True or false?
a. True
b. False
   
The process that moves water through the earth and rocks until it reaches the water table is called?
a. Precipitation
b. Run-off
c. Percolation
d. Groundwater
       
In Europe, microbiological contamination in bathing water causes how many cases of gastrointestinal disease per year?
a. 500,000
b. 1 million
c. 1.5 million
d. 2 million
       
What percentage of the water used in Europe by man is used by industry?
a. 20
b. 35
c. 44
d. 53
       
Which human activity contributes the most nitrates into waters?
a. Industry
b. Agriculture
c. Transport
d. Energy production
       
Only 0.6 percent of the water on Earth is fit for drinking. True or false?
a. True
b. False
   
What percentage of the water we use serves an essential human need?
a. 3
b. 5
c. 10
d. 20
       
When modern technologies are applied, how much water is saved in industry?
a. 15 percent
b. 30 percent
c. 50 percent
d. 90 percent
       
Which of the following is a source of water pollution?
a. Industrial water discharge in rivers without wastewater treatment
b. Construction of bridges and correction of riverbanks
c. Extraction of sand and rubble from rivers
d. All of the above
       
Which of the following groups of water pollutants causes disease?
a. Oxygen-demanding waste
b. Bacteria, viruses, protozoa and parasitic worms
c. Inorganic plant nutrients
d. Organic chemicals
       
Groundwater reacts slowly to changes on the surface. True or false?
a. True
b. False
   
Secondary sewage treatment is:
a. A mechanical process to filter out stones, sticks and rags
b. A biological process in which aerobic bacteria are used to remove the biodegradable, oxygen-demanding organic waste
c. A series of specialised chemical and physical processes that remove specific pollutants
d. None of the above
       


 
  Main menu
  ABOUT US