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MCQs

Total Questions : 2096 | Page 7 of 210 pages
Question 61. 1m³ of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be
  1.    35 K
  2.    174 K
  3.    274 K
  4.    154 K
 Discuss Question
Answer: Option C. -> 274 K
Question 62. When pressure is applied on the system, ice ⟷ water, then
  1.    Equilibrium can not be established
  2.    More ice will be formed
  3.    More water will be formed
  4.    Evaporation of water will take place
 Discuss Question
Answer: Option C. -> More water will be formed
Question 63. If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law.
  1.    Hess's
  2.    Kirchoff's
  3.    Lavoisier and Laplace
  4.    None of these
 Discuss Question
Answer: Option A. -> Hess's
Question 64. If atmospheric temperature and dew point are nearly equal, then the relative humidity is
  1.    Zero
  2.    50%
  3.    Almost 100%
  4.    Unpredictable
 Discuss Question
Answer: Option C. -> Almost 100%
Question 65. First law of thermodynamics deals with the
  1.    Direction of energy transfer
  2.    Reversible processes only
  3.    Irreversible processes only
  4.    None of these
 Discuss Question
Answer: Option A. -> Direction of energy transfer
Question 66. In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is
  1.    More
  2.    Less
  3.    Same
  4.    Unpredictable; depends on the particular reaction
 Discuss Question
Answer: Option C. -> Same
Question 67. COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
  1.    0.5
  2.    3.5
  3.    4.5
  4.    8.5
 Discuss Question
Answer: Option B. -> 3.5
Question 68. Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.
  1.    Infinity
  2.    Minus infinity
  3.    Zero
  4.    None of these
 Discuss Question
Answer: Option B. -> Minus infinity
Question 69. The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is
  1.    3
  2.    1
  3.    2
  4.    0
 Discuss Question
Answer: Option B. -> 1
Question 70. Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?
  1.    Air cycle
  2.    Carnot cycle
  3.    Ordinary vapour compression cycle
  4.    Vapour compression with a reversible expansion engine
 Discuss Question
Answer: Option A. -> Air cycle

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