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.Management Sciences
Category: Chemical Environmental Engineering
In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
A. Filtration
B. Coagulation
C. Sedimentation
D. Disinfection
World environment day is observed every year on the 5th of___________________?
A. June
B. December
C. July
D. September
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?
A. Sedimentation tank
B. Circular clarifier
C. Mechanical flocculation
D. Chemical coagulation
Which of the following is the most widely used disinfectant in water treatment ?
A. Chlorine
B. Irradiation of water by ultraviolet light
C. Cation exchanger
D. Coagulation
Carcinogenic air pollutants cause__________________?
A. Bone decay
B. Cancer
C. Asphyxiation (suffocation)
D. Anemia
Higher concentration of CO2 in atmosphere_____________________?
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.
Which of the following is not a practical method of low level radioactive waste disposal ?
A. Dilution with inert material
B. Discharging to atmosphere through tall stacks after dilution
C. Disposing off in rivers & oceans
D. Filling in steel crates and shooting it off out of earth’s gravity
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