# NEET Physics Thermodynamics Questions Solved

P-V plots for two gases during adiabatic process are shown in the figure. Plots 1 and 2 should correspond respectively to -

(1) He and O2

(2) O2 and He

(3) He and Ar

(4) O2 and N2

(2) In adiabatic process, slope of PV-graph.

$\frac{dP}{dV}=-\gamma \frac{P}{V}$ ⇒ |Slope| ∝ γ

From the given graph (Slope)2 > (Slope)1${\gamma }_{2}>{\gamma }_{1}$

therefore 1 should correspond to O2 (γ = 1.4) and 2 should correspond to He (γ = 1.66)

Difficulty Level:

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