Category: Chemical Environmental Engineering

A. Foaming from boilers
B. Its dissolved oxygen content
C. Its silica content
D. Caustic embrittlement

A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven
automobile exhaust
B. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light
C. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees
D. H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is
oxidised to SO2

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

A. Grey
B. Dark brown
C. Red
D. Black

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

A. Sedimentation tank
B. Circular clarifier
C. Mechanical flocculation
D. Chemical coagulation

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

A. < 1
B. 10-100
C. 100-200
D. 100-1000

A. Bone decay
B. Cancer
C. Asphyxiation (suffocation)
D. Anemia

A. Allows visible solar radiation (ultraviolet) of short wave-length to pass through
B. Reflects and absorbs the longer wavelength (infra-red) radiations
C. Prevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming
D. All A., B. and C.