Which of the following pollutants is absent in the emissions from a fertiliser plant ?
(A) SO2 & SO3
(B) NO2
(C) NH3
(D) CO
During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank?
(A) Filtration
(B) Digestion
(C) Sedimentation
(D) Both
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes____________________?
(A) Cancer
(B) Silicosis
(C) Respiratory disease (e.g., asthma)
(D) Reduced crop yield
Exposure to chemicals having carcinogenic properties cause___________________?
(A) Dermatitis (skin disorder)
(B) Cancer
(C) Asphyxiation
(D) Asthma
Which of the following air pollutants is not toxic to vegetation i.e., doesn’t cause vegetation damage ?
(A) Smog & ozone
(B) Hydrogen fluoride & nitrogen oxides
(C) Sulphur dioxide & spray of weed killers
(D) Carbon monoxide
Presence of high concentration of ozone and smog in atmospheric air causes the __________________?
(A) Embrittlement & decrease of folding resistance of paper
(B) Cracking of rubber products
(C) Fading of dye on textiles
(D) Damage of electrical insulator on high tension power line
Main pollutants released from petroleum refineries is__________________?
(A) CO, SO2 & H2S
(B) CO2, NO & SO3
(C) CO2, H2S & NO2
(D) SO3, NO2 & CO2
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?
(A) Coal ash
(B) Potassium cyanide
(C) Ortho-xylene
(D) None of these
In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
(A) Hydrochloric acid
(B) Lime
(C) Copper sulphate
(D) Sodium sulphate
What are the methods of treatment & disposal of radioactive wastes ?
(A) Evaporation & chemical precipitation
(B) Biological methods & adsorption in ion exchange materials
(C) Fixing into a solid mass with cement and sinking deep in the sea
(D) All