| Consider the following statements: |
| 1. Clouds generally reflect some of the sunlight in different directions and the rest is absorbed |
| 2. Nearly 90% of the water vapour lies below 12 km of the atmosphere |
| 3. Water vapour does not exceed 3 percent to 4 percent of total volume of air |
| 4. Nitrogen serves mainly as diluent and dissolver |
| Which of the above statements is/are not correct? |
A) 1 and 2
B) 2 and 3
C) 3 only
D) 3 and 4
Correct Answer: A
Solution :
[a] Below 12 km refers to area in the troposphere and the troposphere contains approximately 75% of the atmosphere's mass and 99% of its water vapour and aerosols. The average depth of the troposphere is approximately 17 km in the middle latitudes.
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