For the $P-V$ diagram given for an ideal gas,which of the following correctly represents the $T-P$ diagram?

The condition $dQ = dW$ holds good in which of the following?

Is the melting of ice an adiabatic or an isothermal process?

Two identical containers $A$ and $B$ with frictionless pistons contain the same ideal gas at the same temperature and the same volume $V$. The mass of the gas in $A$ is ${m_A}$ and that in $B$ is ${m_B}$. The gas in each cylinder is now allowed to expand isothermally to the same final volume $2V$. The changes in the pressure in $A$ and $B$ are found to be $\Delta P$ and $1.5 \Delta P$ respectively. Then:

Can the change in internal energy of an ideal gas be non-zero during an isothermal process?

Heat is given to an ideal gas in an isothermal process. Then