Which of the following is not a natural source of air pollution ?

Related Mcqs:

The upper layer of atmosphere is called the ____________________?

A. Stratosphere B. Troposphere C. Ionosphere D. None of these...

Which of the following is the most widely used disinfectant in water treatment ?

A. Chlorine B. Irradiation of water by ultraviolet light C. Cation exchanger D. Coagulation...

World environment day is observed every year on the 5th of___________________?

A. June B. December C. July D. September...

In a sedimentation tank, the detention period for water ranges from _____________ hours?

A. 2 to 4 B. 8 to 12 C. 16 to 20 D. 24 to 32...

In water treatment, alum [Al2(SO4)3] is used for the process of __________________?

A. Filtration B. Coagulation C. Sedimentation D. Disinfection...