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प्रश्न
Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted.
Reason(R): High biological oxygen demand means high activity of bacteria in water.
विकल्प
Both (A) and R are correct and (R) is the correct explanation of (A)
Both (A) and R are correct and (R) is not the correct explanation of (A)
Both (A) and (R) are not correct
(A) is correct but (R) is not correct
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उत्तर
(A) is correct but (R) is not correct
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संबंधित प्रश्न
Bhopal Gas Tragedy is a case of ________.
Photo chemical smog formed in congested metropolitan cities mainly consists of ______.
Living in the atmosphere of CO is dangerous because it ______.
Match the List I with List II and select the correct answer using the code given below the lists.
| List I | List II | ||
| A | Depletion of ozone layer |
1 | CO2 |
| B | Acid rain | 2 | NO |
| C | Photochemical smog | 3 | SO2 |
| D | Green house effect | 4 | CFC |
What would happen, if the greenhouse gases were totally missing in the earth’s atmosphere?
Define smog.
From where does ozone come in the photo chemical smog?
Explain how does greenhouse effect cause global warming.
Explain the effects of acid rain.
Differentiate the following:
Viable and non-viable particulate pollutants
