MHTCET 11 Apr 2026 Shift 1 Paper

Concept: For an ideal gas, internal energy depends only on temperature.Explanation:In an ideal gas, the internal energy $U$ is a function of temperature alone.Therefore, the change in internal energy is directly proportional to the change in temperature:$$\Delta U \propto \Delta T$$In an isothermal process, the temperature of the system remains constant.So, the change in temperature is zero:$$\Delta T = 0$$Substituting this condition gives:$$\Delta U = 0$$Other processes involve changes in temperature or heat transfer, so they do not satisfy this condition.Hence, the process in which $\Delta U = 0$ is the isothermal process.Answer: The correct option is B. Isothermal process.