Class XI

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
Thermodynamics is the branch of physics that deals with.
  1. the concepts of heat and dust and the inter-conversion of heat and other forms of matter
  2. the concepts of kinetic energy and temperature and the inter-conversion of mechanical and other forms of energy
  3. the concepts of heat and temperature and the inter-conversion of heat and other forms of energy
  4. the concepts of heat and noise and the inter-conversion of noise and other forms of energy
In Thermodynamics Extensive variables depend
  1. on the ‘temperature’ of the system
  2. on the ‘entropy’ of the system
  3. on the ‘pressure’ of the system
  4. on the ‘size’ of the system
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
Zeroth Law of Thermodynamics
  1. states that two systems in thermal equilibrium with a third system simultaneously are never in thermal equilibrium with each other
  2. states that two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other
  3. states that two systems in thermal equilibrium with a third system separately cannot be in thermal equilibrium with each other
  4. states that a system in thermal equilibrium with a third system separately is in thermal equilibrium with any other
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