A) expanded by adding more molecules to It
B) expanded by adding more heat to it
C) expanded against zero pressure
D) compressed by doing work on it
Correct Answer: A
Solution :
Key Idea: An isothermal process is one, in which the pressure and volume of the system change but temperature remains constant. Internal energy of an ideal gas is given by \[U=\frac{f}{2}\mu RT\] \[=\frac{f}{2}\left( \frac{N}{{{N}_{A}}} \right)RT\] \[\Rightarrow \] \[U\propto NT.\] In isothermal process, T = constant \[\Rightarrow \] \[U\propto N\]ie, internal energy increases by increasing number of molecules (N).
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