Q. No.In a water body polluted with biodegradable organic compounds,
1. the BOD and DO content are low
2. the BOD and DO content are high
3. the BOD is low and DO content is high
4. the BOD is high and DO content is low
1. the BOD and DO content are low
2. the BOD and DO content are high
3. the BOD is low and DO content is high
4. the BOD is high and DO content is low
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The world’s most problematic aquatic weed, “The terror of Bengal”, is the name given to:
| 1. | Zostera | 2. | Ceratophyllum |
| 3. | Eichhornia | 4. | Parthenium |
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An increase in concentration of the intoxicant at successive trophic levels is known as:
| 1. | Eutrophication | 2. | Biomagnification |
| 3. | Bioremediation | 4. | Biofortification |
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High concentrations of accumulated DDT in birds:
1. kills pathogens in their blood
2. causes sterility by affecting gametogenesis
3. leads to premature breaking of eggs
4. causes spasticity of the muscles of the body
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What was added in 1987 as a pollutant to The Air (Prevention and Control of Pollution) Act, [originally passed in 1981]?
1. radioactive wastes
2. CFCs
3. ground level ozone
4. noise
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Which of the following statements is not true regarding CNG?
1. It is non-polluting
2. It burns more efficiently than petrol and diesel
3. It cannot be siphoned off by thieves
4. It cannot be adulterated
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To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
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According to CPCB, what particulate size is most harmful to humans:
1. more than 10 micrometers
2. between 5 to 10 micrometers
3. between 2.5 and 5 micrometers
4. less than 2.5 micrometers
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Photochemical smog is formed in traffic congested cities where the conditions are:
1. cool and intense solar radiation
2. cool and less solar radiation
3. warm and intense solar radiation
4. warm and less solar radiation
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