Hydrogen ion concentration in distilled water is___________________?
Hydrogen ion concentration in distilled water is___________________?
A. 10-7
B. 7 × 10-7
C. 107
D. 7 × 107
Chemical Environmental Engineering
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The progressive warming up of the earth’s surface is mainly due to the___________________?
The progressive warming up of the earth’s surface is mainly due to the___________________?A. Automobile exhaust
B. Blanketing effect of CO2 in the atmosphere
C. De-forestation
D. Thickening of ozone layer -
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?A. Ionosphere
B. Troposphere
C. Stratosphere
D. None of these -
TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?
TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?A. Skin disorder
B. Bronchitis
C. Bone disease
D. Cancer -
The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?
The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?A. 10
B. 200
C. 1000
D. 2000 -
Which of the following processes is involved in the biochemical treatment of sewage effluents ?
Which of the following processes is involved in the biochemical treatment of sewage effluents ?A. Oxidation
B. Reduction
C. Dehydration
D. Fermentation -
The maximum CO2 is emitted into the atmosphere by_________________?
The maximum CO2 is emitted into the atmosphere by_________________?A. Combustion
B. Urea
C. Biomass burning
D. Trees -
Color test of water is done with an instrument called__________________?
Color test of water is done with an instrument called__________________?A. Tintometer
B. Colorimeter
C. Electro-chemical cell
D. Turbidimeter -
Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?A. 10 to 20
B. 100 to 200
C. 1500 to 2500
D. 4000 to 5000 -
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?A. Cesspool
B. Lagoon
C. Skimming mill
D. Septic tank