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1st law of thermodynamics is nothing but the law of conservation of

A. Momentum

B. Mass

C. Energy

D. None of these

Correct Answer : C.


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  1. Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called…
  2. As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
  3. Equilibrium constant decreases as the temperature
  4. Chemical potential of ith component of a system is given by
  5. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance,…
  6. The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for
  7. For a single component two phase mixture, the number of independent variable properties are
  8. Pick out the correct statement.
  9. __________ does not change during phase transformation processes like sublimation, melting & vaporisation.
  10. A reasonably general expression for vapourliquid phase equilibrium at low to moderate pressure is φi…
  11. Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).
  12. (∂H/∂T)P is the mathematical expression for
  13. With increase in temperature, the internal energy of a substance
  14. Change of state namely evaporation condensation, freezing and melting is an __________ process.
  15. Pick out the wrong statement.
  16. Which of the following has the minimum value of COP for a given refrigeration effect?
  17. With increase in temperature, the atomic heat capacities of all solid elements
  18. The equation, Cp - Cv = R, is true for __________ gas.
  19. The shape of T-S diagram for Carnot Cycle is a
  20. The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the __________ of a substance.
  21. The expression, nCv(T2 - T1), is for the __________ of an ideal gas.
  22. Which of the following processes cannot be made reversible even under ideal condition of operation?
  23. Gibbs-Duhem equation
  24. With increase in compression ratio, the efficiency of the otto engine
  25. Reduced pressure of a gas is the ratio of its
  26. A change in state involving a decrease in entropy can be spontaneous, only if
  27. At absolute zero temperature, the __________ of the gas is zero.
  28. At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero.…
  29. A gas performs the maximum work, when it expands
  30. For a reversible process involving only pressure-volume work