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. 650
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Turbidity of water is an indication of the presence of__________________?
Turbidity of water is an indication of the presence of__________________?A. Suspended inorganic matter
B. Dissolved solids
C. Floating solids
D. Dissolved gasesArsenic pollutant is not generated in _______________ industries?
Arsenic pollutant is not generated in _______________ industries?A. Tanneries
B. Glass & ceramic
C. Beverages
D. Any of theseCorrosion in boilers can be prevented by _________________?
Corrosion in boilers can be prevented by _________________?A. Deaeration of feed water
B. Enhancing pH of feed water by adding alkali
C. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen
and prevents corrosion
D. All A., B. and C.In the context of the chemical process industries, the term BOD is normally associated with the_____________________?
In the context of the chemical process industries, the term BOD is normally associated with the_____________________?A. Characterisation of solid wastes
B. Organic concentration in gaseous effluents
C. Characterisation of liquid effluents
D. Characterisation of boiler feed waterReplenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?A. Natural aeration of water stream
B. Photosynthetic action of algae
C. Both A. & B.
D. Neither A. nor B.Salt content in sea water is about ______________ percent?
Salt content in sea water is about ______________ percent?A. 0.5
B. 1
C. 3.5
D. 9.05