| 1 |
The gas use by plants to perform photosynthesis. |
- A. O<sub>2</sub>
- B. CO<sub>2</sub>
- C. N<sub>2</sub>
- D. CO
|
| 2 |
Which one of the following is not air pollutant. |
- A. CO<sub>2</sub>
- B. CO
- C. NO<sub>2</sub>
- D. O<sub>2</sub>
|
| 3 |
Ozone id beneficial for us as it: |
- A. absorbs infrared radiations
- B. absorbs ultraviolet radiation
- C. absorbs chlorofluorocarbons
- D. absorbs air pollutants
|
| 4 |
Just above the Earth's surface is |
- A. Mesosphere
- B. Stratosphere
- C. Theremosphere
- D. Troposphere
|
| 5 |
Which is not an air pollutant? |
- A. CO<sub>2</sub>
- B. CO
- C. SO<sub>2</sub>
- D. NH<sub>3</sub>
|
| 6 |
Which one of the following is not air pollutants? |
- A. N<sub>2</sub>
- B. CO
- C. NO<sub>2</sub>
- D. O<sub>2</sub>
|
| 7 |
99% of atmosphere consists of . |
- A. N<sub>2 </sub>and H<sub>2</sub>
- B. N<sub>2</sub>and O<sub>2</sub>
- C. N<sub>2</sub>and CO<sub>2</sub>
- D. O<sub>2</sub>and CO<sub>2</sub>
|
| 8 |
The region of ozone decomposition in stratosphere is. |
- A. 20 km
- B. 30 km
- C. 40 km
- D. 50 km
|
| 9 |
Which one of the following gas has greater retaining capacity? |
- A. O<sub>2</sub>
- B. N<sub>2</sub>
- C. CO
- D. CO<sub>2</sub>
|
| 10 |
In the bacterial decay, the compound of which element are emitted. |
- A. Sulphur
- B. Carbon
- C. Nitrogen
- D. All of them
|
