Physics · 2013
JEE Main · 9 April 2013, Shift 1 · Q30
There are two identical chambers, completely thermally insulated from surroundings. Both chambers have a partition wall dividing the chambers in two…
There are two identical chambers, completely thermally insulated from surroundings. Both chambers have a partition wall dividing the chambers in two compartments. Compartment $\displaystyle 1$ is filled with an ideal gas and Compartment $\displaystyle 3$ is filled with a real gas. Compartments $\displaystyle 2$ and $\displaystyle 4$ are vacuum. A small hole (orifice) is made in the partition walls and the gases are allowed to expand in vacuum.
Statement $\displaystyle 1$ : No change in the temperature of the gas takes place when ideal gas expands in vacuum. However, the temperature of real gas goes down (cooling) when it expands in vacuum.
Statement $\displaystyle 2$ : The internal energy of an ideal gas is only kinetic. The internal energy of a real gas is kinetic as well as potential.Official answer
(2)
Statement $\displaystyle 1$ and Statement $\displaystyle 2$ both are true. Statement $\displaystyle 2$ is the correct explanation of Statement 1.
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.