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Water vapour in the air varies from zero to what per cent by volume?
AFour
BNine
CTwo
DSix
Answer & Solution
Correct answer: A. Four
1. It plays a key role in weather.
2. It ranges from zero to four per cent.
3. Water exists in the air as gas, liquid and solid.
_Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 11, Water in the Atmosphere._
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