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.Management Sciences
Category: Chemical Environmental Engineering
TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
A. 5
B. 100
C. 1000
D. 2000
Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?
A. Carbonates
B. Bi-carbonates
C. Iron & manganese
D. Arsenic
Which of the following pollutants, if present in atmosphere is detectable by its odour ?
A. CO
B. SO2
C. NO2
D. CO2
Out of the following, TLV of _______________ is maximum (about 500 ppm)?
A. Carbon dioxide
B. Toluene
C. Carbon disulphide
D. Acetaldehyde
Pick out the wrong statement ?
A. Low ozone layer thickness in polar regions is due to cold climatic conditions
B. Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to
that emitted by a four stroke engine
C. Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to
that emitted from a four stroke engine
D. Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is
responsible for causing Minamata disease
Removal of ______________ is accomplished by aeration of water?
A. Dissolved gases
B. Suspended solids
C. Dissolved solids
D. None of these
Presence of excess fluorine in water causes__________________?
A. Dental cavity
B. Tooth decay
C. Fluorosis
D. Respiratory disease
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?
A. Paralysis of muscles & loss of appetite
B. Nervous depression
C. Gastritis and diarrhea
D. All A., B. and C.
The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?
A. Anaerobic
B. Saprophytic
C. Aerobic
D. Parasitic
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?
A. Explosion
B. Non biodegradable foam
C. Undesirable plant growth
D. Corrosion
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