Carbon monoxide is a pollutant, which causes_________________?
(A) Respiratory disease (e.g. asthma)
(B) Asphyxiation (suffocation) leading to death
(C) Retardation in crop growth
(D) Damage to building materials like marble
Which of the following is the most detrimental for water used in high pressure boiler ?
(A) Silica
(B) Turbidity
(C) Phenol
(D) Dissolved oxygen
Septic tanks are used for the ______________ of the deposited solids?
(A) Separation
(B) Anaerobic decomposition
(C) Aerobic decomposition
(D) None of these
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?
(A) Radioactive
(B) Organic
(C) Inorganic
(D) None of these
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called_________________?
(A) Fumes
(B) Mists
(C) Smoke
(D) Aerosols
The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?
(A) Anaerobic
(B) Saprophytic
(C) Aerobic
(D) Parasitic
Presence of _____________ hardness is responsible for the temporary hardness in water?
(A) Carbonate
(B) Calcium
(C) Chloride
(D) Sulphate
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is__________________?
(A) Inversely proportional to viscosity of gas
(B) Proportional to the viscosity & density of the gas
(C) Proportional to the pressure of the gas
(D) Both
Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?
(A) Reduce SO2 content in
(B) Catalytically convert SO2 to SO3 in
(C) Increase the dew point of
(D) None of these
The main industrial source of emission of hydrogen sulphide air pollutant is________________?
(A) Petroleum refineries
(B) Coal based thermal power plants
(C) Pulp and paper plant
(D) Metallurgical roasting & smelting plant