Class XI

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
The picture of heat as a fluid was discarded in favor of the modern concept of heat as a form of energy because
  1. Count Rumford observed that boring of brass cannon generated a lot of smoke
  2. Count Rumford observed that boring of brass cannon generated a lot of heat
  3. Count Rumford observed that boring of brass cannon generated a lot of noise
  4. Count Rumford observed that boring of brass cannon generated a lot of dust
Internal energy of a system
  1. is the change in the sum of the kinetic energies and potential energies of the molecules of the system
  2. is the difference of the kinetic energies and potential energies of the molecules of the system
  3. is the change in the difference of the kinetic energies and potential energies of the molecules of the system
  4. is the sum of the kinetic energies and potential energies of the molecules 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
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
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