80% less than 200 mesh size particles are called____________________?
80% less than 200 mesh size particles are called____________________?
A. Smoke
B. Powder
C. Grit
D. Aggregates
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TLV of lead for public sewer/waste water is about ______________ ppm?
TLV of lead for public sewer/waste water is about ______________ ppm?A. 1
B. 25
C. 150
D. 650The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?A. Chlorine
B. Alkalis
C. Benzene hexachloride
D. Alkyl benzene sulphonate (ABS)Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?
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 plantA shallow pond in which the sewage is retained and biologically treated is called__________________?
A shallow pond in which the sewage is retained and biologically treated is called__________________?A. Oxidation
B. Imhoff tank
C. Lagoon
D. Skimming tankSuspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?A. Biological oxygen pond
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Lagoons
D. FiltrationPresence of _____________ bacteria in water causes disease like typhoid?
Presence of _____________ bacteria in water causes disease like typhoid?A. Aerobic
B. Pathogenic
C. Anaerobic
D. Non-pathogenic