### Class XI

In a quasi-static process,
1. the temperature of the surrounding reservoir and the external pressure differ substantially from the temperature and pressure of the system
2. the temperature of the surrounding reservoir and the external pressure equal the temperature and pressure of the system
3. the temperature of the surrounding reservoir differ only infinitesimally from the temperature of the system
4. the temperature of the surrounding reservoir and the external pressure differ only infinitesimally from the temperature and pressure of the system
Thermodynamic state of a system is an equilibrium state
1. if the macroscopic variables that characterize the system change decrease in time
2. if the macroscopic variables that characterize the system do not change in time
3. if the macroscopic variables that characterize the system change randomly
4. if the macroscopic variables that characterize the system change linearly in time
In case of isobaric process the volume of an ideal gas change the work done by the gas is given by
1. P ΔΔV
2. P + ΔΔV
3. P - ΔΔV
4. P / ΔΔV
Diathermic wall is
1. a thermally insulating wall that does not allow flow of heat from one body to many
2. a thermally conducting wall that allows flow of heat from one body to another
3. a thermally insulating wall that allows flow of heat from one body to another
4. a thermally conducting wall that does not allow flow of heat from one body to another
If ΔΔQ is the energy supplied to the system ΔΔU the change in internal energy, and ΔΔW the work done on the environment, First Law of Thermodynamics states that
1. ΔΔQ = ΔΔU + ΔΔW
2. ΔΔQ = ΔΔU - ΔΔW
3. ΔΔQ = ΔΔU ×× ΔΔW
4. ΔΔU + ΔΔW = 0
0
0

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