The specific heat of an isothermal process is:

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

An ideal gas is subjected to an isothermal expansion such that its volume changes from $V_i$ to $V_f$ and pressure from $P_i$ to $P_f$. The work done on the gas is:

The temperature of an ideal gas is kept constant as it expands. The gas does external work. During this process,the internal energy of the gas

Two identical vessels $A$ and $B$ with frictionless pistons contain the same ideal gas at the same temperature and the same volume $V$. The masses of gas in $A$ and $B$ are $m_A$ and $m_B$, respectively. The gases are allowed to expand isothermally to the same final volume $2V$. The changes in pressures of the gas in $A$ and $B$ are found to be $\Delta P$ and $1.5 \Delta P$, respectively. Then

$A$ container that suits the occurrence of an isothermal process should be made of