Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
A. 20
B. 100
C. 400
D. 200
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Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?A. 105
B. 135
C. 160
D. 185H2S present in gaseous stream can be removed by adsorption on _____________________?
H2S present in gaseous stream can be removed by adsorption on _____________________?A. Silica gel
B. Active carbon
C. Bog iron
D. Limestone powderPresence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?A. 84
B. 88
C. 80
D. 92Pick out the one which is not a chemical coagulant ?
Pick out the one which is not a chemical coagulant ?A. Aluminium sulphate
B. Ferrous sulphate
C. Hydrated lime
D. ChloramineSmoke is produced due to__________________?
Smoke is produced due to__________________?A. Insufficient supply of combustion air and insufficient time for combustion
B. Poor quality of fuel and improper mixing of fuel & combustion air
C. Poor design & overloading of furnace
D. All A., B. and C.Iron & manganese present in the polluted water is removed by __________________?
Iron & manganese present in the polluted water is removed by __________________?A. Simple filtration
B. Oxidation followed by settling & filtration
C. Chemical coagulation
D. Chlorination only