A thermally insulated container is divided into two parts by a screen. In one part the pressure and temperature are $P$ and $T$ for an ideal gas filled. In the second part it is vacuum. If now a small hole is created in the screen, then the temperature of the gas will
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(c)This is the case of free expansion of gas.
In free expansion $\Delta U = 0$==> Temp. remains same.
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