A) thermal power plant
B) Automobile
C) radioactive power plant
D) hydroelectric power plant
Correct Answer: D
Solution :
Hydroelectric power plants do not cause pollution. The thermal power plants and automobiles cause air pollution. The chief pollutants of thermal power plants are fly ash, \[S{{O}_{2}},\] hydrocarbons and other gases and the pollutants of automobiles are CO, hydrocarbons SPM and other gases. Radioactive power plants are the source of radioactive pollution and thermal pollution. The radioactive pollutants contain strontium-90, iodine-131, caesium-137 and isotopes of iron.
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