List of top Physics Questions on First law of thermodynamics asked in WBJEE

Three engines A, B and C take steam at \( 130^\circ\text{C} \) and reject it at \( 20^\circ\text{C} \), \( 40^\circ\text{C} \) and \( 50^\circ\text{C} \) respectively. The most efficient engine will be
Adiabatic free expansion of ideal gas must be
$X$ is an extensive property and $x$ is an intensive property of a thermodynamic system. Which of the following statement(s) is/are correct?