A. Oxides of sulphur
B. Oxides of nitrogen
C. Carbon monoxide
D. Hydrogen sulphide
Which of the following is the most major constituents of air pollutants ? Read More »
Chemical Environmental Engineering A. Use of silencers
B. Green house gases
C. Vibration damg
D. Tree plantation
______________ cannot control the noise pollution ? Read More »
Chemical Environmental Engineering A. Hydrocarbons
B. Hydrogen fluoride
C. Hydrogen sulphides
D. Nitrogen dioxide
A. 20
B. 100
C. 400
D. 200
Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm? Read More »
Chemical Environmental Engineering A. 90
B. 120
C. 150
D. 180
A. Stratosphere
B. Thermosphere
C. Troposphere
D. Mesosphere
A. Foul smell and taste
B. Iron and manganese
C. Temporary hardness
D. Permanent hardness
____________ is removed from water by lime-soda process? Read More »
Chemical Environmental Engineering A. Thermosphere
B. Stratosphere
C. Troposphere
D. Mesosphere
A. Silica
B. Turbidity
C. Phenol
D. Dissolved oxygen
Which of the following is the most detrimental for water used in high pressure boiler ? Read More »
Chemical Environmental Engineering A. Separation
B. Anaerobic decomposition
C. Aerobic decomposition
D. None of these
Septic tanks are used for the ______________ of the deposited solids? Read More »
Chemical Environmental Engineering