| Examine the following statements and select the correct answer using the code given below. |
| 1. Gases in heterosphere are not evenly mixed |
| 2. Troposphere contains over 90% of the earth's water vapour |
| 3. Hydrogen is confined to lower layers of the atmosphere |
| 4. Temperature at tropopause is less at the equator than at the poles |
A) 1, 2 and 3 only
B) 1, 2 and 4 only
C) 2, 3 and 4 only
D) 1, 3 and 4 only
Correct Answer: B
Solution :
Hydrogen is a light gas and extends to 1100 km over heavier gases. Temperature at tropopause is less at the equator than at the poles because height of tropopause is 18 km at the equator and 10 km at the poles.
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