Presence of soluble organics in polluted water causes_________________?
(A) Undesirable plants growth
(B) Depletion of oxygen
(C) Fire hazards
(D) Explosion hazards
Persons working in cement plants and limestone quarries are more prone to disease like__________________?
(A) Cancer
(B) Asthma
(C) Silicosis
(D) Fluorosis (bone disease)
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
(A) Bacterial stability factor
(B) Relative stability
(C) Biological oxygen demand (BOD)
(D) Oxygen ion concentration
Siderosis is a disease caused by the inhalation of ______________ dust?
(A) Coal
(B) Silica
(C) Iron
(D) None of these
Lagooning process is mainly a means of the__________________?
(A) Sludge disposal
(B) Reduction of excessive flow in sewers
(C) Biological treatment of wastes
(D) None of these
Peroxyacetyl nitrate (PAN), a pollutant is found in the_________________?
(A) Automobile exhaust
(B) Flue gas of coal based power plant
(C) Exhaust of nitric acid plant
(D) Exhaust of sulphuric acid plant
. Operating principle of cyclone separator is based on the action of _______________ dust particles?
(A) Diffusion of
(B) Centrifugal force on
(C) Gravitational force on
(D) Electrostatic force on
Green house effect is accentuated by________________?
(A) Deforestation
(B) Rapid industrialisation
(C) Increased transportation activity
(D) All
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?
(A) Explosion
(B) Non biodegradable foam
(C) Undesirable plant growth
(D) Corrosion
The widest explosive limit is of _____________, thereby making it the most explosive gas?
(A) Acetylene
(B) Petrol vapor
(C) Hydrogen
(D) Carbon monoxide