| 1. Gases in hetero sphere 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 troop pause 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 :
Hyden 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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