The graph below shows V-p curve for three processes. Choose the correct statement(s) :

Options

A. Work done is maximum in process `1` .
B. Temperature must increase in process `2` & `3` .
C. Heat must be supplied in process `1`.
D. If final volume of gas in process `1,2` and `3` are same then temperature must be same.

Answer

A, C

Explanation

Area `P-V` curve and volume axis represent work.
Internal energy in `1` decreases (expansion at constant pressure)
In process `2` and `3` internal energy may decreased depending on the process .
Since final pressure of `1, 2` & `3` are different, final temperature must also be different.