If a system undergoes contraction of volume,then the work done by the system will be:

The first law of thermodynamics confirms the law of . . . . . . .

$7$ mole of a certain monoatomic ideal gas undergoes a temperature increase of $40 K$ at constant pressure. The increase in the internal energy of the gas in this process is $.... J$ (Given $R = 8.3 J K^{-1} mol^{-1}$)

$A$ diatomic gas has an initial internal energy of $80 cal$. $A$ work of $18 cal$ is done on the gas and the gas releases heat energy of $42 J$. The final internal energy of the gas is

$A$ source supplies heat to a system at the rate of $1000 \, W$. If the system performs work at a rate of $200 \, W$,the rate at which the internal energy of the system increases is $....... \, W$.

In a cyclic process,the work done by the system is