Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances? A. Radioactive B. OrganicC. 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. SmokeD. Aerosols
The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria? A. Anaerobic B. SaprophyticC. Aerobic D. Parasitic
Presence of _____________ hardness is responsible for the temporary hardness in water? A. CarbonateB. 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…
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 refineriesB. Coal based thermal power plants C. Pulp and paper plant D. Metallurgical roasting & smelting plant
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________? A. Natural aeration of water stream B. Photosynthetic action of algaeC. Both A. & B. D. Neither A. nor B.
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________? A. Food industry B. Municipal sewage treatment C. Petroleum refinery D. Iron & steel plant
Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________________? A. Blood poisoning B. Anaemia C. Nervous system disorderD. All A., B. and C.