$A$ gas is taken through a cyclic process $ABCA$ as shown in the figure. If $2.4 \, cal$ of heat is given in the process,what is the value of $J$ in $J/cal$ (mechanical equivalent of heat)?

$A$ system goes from $A$ to $B$ via two processes $I$ and $II$ as shown in the figure. If $\Delta U_1$ and $\Delta U_2$ are the changes in internal energies in the processes $I$ and $II$ respectively,then

What is the total work done in the given $P-V$ graph?

An ideal gas is made to undergo the cyclic process shown in the figure below. Let $\Delta W$ depict the work done,$\Delta U$ be the change in internal energy of the gas,and $Q$ be the heat added to the gas. The signs of each of these three quantities for the whole cycle will be ($0$ refers to no change):

The given diagram shows an ideal gas taken from state $1$ to $2$ through three different paths $A, B,$ and $C$. Let $Q, W,$ and $\Delta U$ represent the heat supplied to the gas,the work done by the gas,and the change in internal energy of the gas,respectively. Then which of the following conditions is true?

The heat absorbed by a system in going through the given cyclic process is: (in $\,J$)