- 1(current)
Q. No.Biochemical Oxygen Demand (BOD) is-
| 1. | Amount of oxygen required by bacteria to decompose organic matter in a certain volume of a sample of water. |
| 2. | Amount of CO2 required by bacteria to decompose organic matter in a certain volume of a sample of water. |
| 3. | Amount of O3 required by bacteria to decompose organic matter in a certain volume of a sample of water. |
| 4. | None of the above |
Subtopic: Â Water Pollution - Biological Oxygen Demand |
 92%
From NCERT
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Incorrect statement among the following is:
1. Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutant.
2. pH of drinking water should be between 6.5 and 8.5.
3. Concentration of dissolved oxygen below 6 ppm is good for the growth of fish.
4. Clean water would have a BOD value of less than 5 ppm.
Subtopic: Â Gaseous Pollutants - Oxides of C & N |Â Air Pollution - Ozone |Â Water Pollution - Biological Oxygen Demand |
 71%
From NCERT
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Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be :
1. Highly polluted.
2. Poor in dissolved oxygen.
3. Rich in dissolved oxygen.
4. Not suitable for aquatic life.
Subtopic: Â Water Pollution - Biological Oxygen Demand |
 71%
From NCERT
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- 1(current)
Q. No.
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