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MCQs

Total Questions : 2096 | Page 6 of 210 pages
Question 51. What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?
  1.    2
  2.    0
  3.    3
  4.    1
 Discuss Question
Answer: Option A. -> 2
Question 52. The second law of thermodynamics states that
  1.    The energy change of a system undergoing any reversible process is zero
  2.    It is not possible to transfer heat from a lower temperature to a higher temperature
  3.    The total energy of system and surrounding remains the same
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 53. The first law of thermodynamics is a restatement of the law of conservation of
  1.    Mass
  2.    Energy
  3.    Momentum
  4.    None of these
 Discuss Question
Answer: Option B. -> Energy
Question 54. Entropy of the system decreases, when
  1.    Snow melts into water
  2.    A gas expands spontaneously from high pressure to low pressure
  3.    Water is converted into ice
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C
Question 55. If we increase the pressure on a substance (which is at its triple point), then the triple point
  1.    Increases
  2.    Decreases
  3.    Remains unchanged
  4.    May increase or decrease ; depends on the substance
 Discuss Question
Answer: Option C. -> Remains unchanged
Question 56. Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.
  1.    Isothermal
  2.    Adiabatic
  3.    Isentropic
  4.    None of these
 Discuss Question
Answer: Option A. -> Isothermal
Question 57. The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by
  1.    Decrease in enthalpy corresponding to evolution of heat
  2.    Decrease of entropy
  3.    Increase in enthalpy corresponding to absorption of heat
  4.    No change in enthalpy
 Discuss Question
Answer: Option C. -> Increase in enthalpy corresponding to absorption of heat
Question 58. The minimum number of phases that can exist in a system is
  1.    0
  2.    1
  3.    2
  4.    3
 Discuss Question
Answer: Option B. -> 1
Question 59. Van Laar equation deals with the activity co-efficients in
  1.    Binary solutions
  2.    Ternary solutions
  3.    Azeotropic mixture only
  4.    None of these
 Discuss Question
Answer: Option A. -> Binary solutions
Question 60. Extensive properties of a thermodynamic system depend upon the __________ of the system.
  1.    Specific volume
  2.    Temperature
  3.    Mass
  4.    Pressure
 Discuss Question
Answer: Option C. -> Mass

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