Q. No.The reaction/s involved during the formation of photochemical smog are:
\(1. \space NO_2(g) \rightarrow NO(g) + \stackrel{\cdot}{O(g)}\)
\(2. \stackrel{\cdot}{O(g)} + O_2(g) \rightarrow O_3(g)\)
\(3.\space O_3(g) + NO(g) \rightarrow NO_2(g) + O_2(g)\)
4. All of the above
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 |
The major source(s) of soil pollution is/are:
1. Industrial waste.
2. Fertilizers and pesticides.
3. Organic compost.
4. Both (1) are (2)
The example(s) of pesticide is/are-
1. Aldrin
2. Sodium chlorate
3. Dieldrin
4. Both (1) and (3)
Gases responsible for greenhouse effect are :
1. Carbon dioxide (CO2)
2. Ozone (O3)
3. Nitrous oxide (N2O)
4. All of the above.
CO gas is more dangerous than CO2 gas because :
1. CO is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is more stable than the oxygen-haemoglobin complex.
2. CO is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is less stable than the oxygen-haemoglobin complex.
3. CO2 is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is more stable than the oxygen-haemoglobin complex.
4. CO2 is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is less stable than the oxygen-haemoglobin complex.
In the absence of greenhouse gases -
| 1. | Life on earth would be impossible. |
| 2. | Average temperature of the earth will decrease drastically. |
| 3. | There will be no effect on Earth |
| 4. | Both (1) and (2) |
The correct statement about domestic waste is :
| 1. | Only biodegradable domestic waste can be used as manure. |
| 2. | Non-biodegradable waste should be sent to industries for recycling. |
| 3. | It can be disposed off in a landfill. |
| 4. | All of the above. |
Among the following gases, the one that is not a greenhouse gas is :
1. CO
2. O3
3. CH4
4. H2O vapor
Match the terms given in Column I with the compounds given in Column II.
| Column I | Column II |
| A. Acid rain | 1. |
| B. Photochemical smog | 2. |
| C. Combination with hemoglobin | 3. Unsaturated hydrocarbons |
| D. Depletion of the ozone layer | 4. |
Codes
| A | B | C | D | |
| 1. | 4 | 2 | 3 | 1 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 4 | 3 | 2 | 1 |
| 4. | 4 | 1 | 3 | 2 |
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