1. Heating or cooling of descending or ascending air respectively without any change in heat content. |
2. Rise in temperature of the air after injecting heat in the air. |
3. Fall in temperature of the air after heat is taken out of air. |
A) 1 only
B) 1 and 2 only
C) 2 and 3 only
D) 1, 2 and 3
Correct Answer: A
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