Q. No.Limit of BOD prescribed by Central Pollution Control Board for discharge of industrial and municipalwaste waters into natural surface waters is
1. < 3.0 ppm
2. < 10 ppm
3. < 30 ppm
4. < 100 ppm
1. < 3.0 ppm
2. < 10 ppm
3. < 30 ppm
4. < 100 ppm
Montreal protocol which calls for appropriate action to protect the ozone layer from human activitieswas passed in year
1. 1985
2. 1986
3. 1987
4. 1988
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Blue-baby syndrome results from
1. Excess of ODS
2. Excess of chlorides
3. Excess of dissolved oxygen
4. Methaemoglobin
In which one of the following the BOD (Biochemical oxygen demand) of sewage (s), distellary effluent(DE), paper mill effluent (PE) and sugarmill effluent (SE) have been arranged in ascending order.
1. SE < PE < S < DE
2. PE < S < SE < DE
3. S < DE < PE < SE
4. SE < S < PE < DE
In coal fired power plants, electrostatic precipitators are fitted to control emission of:
1.
2. CO
3. SPM
4.
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Which is correct
1. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
2. Cyanobacteria, Anabaena and Nostoc are mobilizers of phosphates and plant nutrition in soil
3. At present it is not possible to grow maize without chemical fertilizers
4. excessive use of chemical fertilizers may lead to eutrophication of nearby water bodies
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Which is not a bio indicator of water pollution
1. Blood worms
2. Stone flies
3. Sewage fungus
4. Sludge worms.
Which one of the following is correct percentage of the two (out of the total of 4) green house gases tocontribute to the total global warming.
1. 6%, 86 %
2. Methane 20% , 18%
3. 40%, CFC 30%
4. CFCs 14%, methane 20%
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According to Central Pollution Control Board (CPCB), Which particulate size in diameter (in
micrometres) of the air pollutants is responsible for greatest harm to human health
1. 1•0 or less
2. 5•2-2•5
3. 2•5 or less
4. 1•5 or less
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