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MCQs

Total Questions : 1058 | Page 79 of 106 pages
Question 781. The state of a substance whose evaporation from its liquid state is complete, is known as
  1.    Vapour
  2.    Perfect gas
  3.    Air
  4.    Steam
 Discuss Question
Answer: Option B. -> Perfect gas
Question 782. In S. I. units, the value of the universal gas constant is
  1.    831.4 J/kg mole-K
  2.    83.14 J/kg mole-K
  3.    8314 J/kg mole-K
  4.    8.314 J/kg mole-K
 Discuss Question
Answer: Option C. -> 8314 J/kg mole-K
Question 783. Petrol is distilled at
  1.    345° to 470°C
  2.    470° to 550°C
  3.    220° to 345°C
  4.    65° to 220°C
 Discuss Question
Answer: Option D. -> 65° to 220°C
Question 784. The calorific value of gaseous fuel is expressed in
  1.    kJ/m3
  2.    kJ/m2
  3.    kJ/kg
  4.    kJ
 Discuss Question
Answer: Option A. -> kJ/m3
Question 785. The efficiency of Carnot cycle is maximum for
  1.    Gas engine
  2.    Petrol engine
  3.    Reversible engine
  4.    Steam engine
 Discuss Question
Answer: Option C. -> Reversible engine
Question 786. A closed system is one in which
  1.    Neither mass nor energy crosses the boundaries of the system
  2.    Mass crosses the boundary but not the energy
  3.    Both energy and mass cross the boundaries of the system
  4.    Mass does not cross boundaries of the system, though energy may do so
 Discuss Question
Answer: Option D. -> Mass does not cross boundaries of the system, though energy may do so
Question 787. An open system is one in which
  1.    Mass crosses the boundary but not the energy
  2.    Both energy and mass cross the boundaries of the system
  3.    Mass does not cross boundaries of the system, though energy may do so
  4.    Neither mass nor energy crosses the boundaries of the system
 Discuss Question
Answer: Option B. -> Both energy and mass cross the boundaries of the system
Question 788. For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)
  1.    P/T = constant, if v is kept constant
  2.    T/P = constant, if v is kept constant
  3.    V/T = constant, if p is kept constant
  4.    P v = constant, if T is kept constant
 Discuss Question
Answer: Option D. -> P v = constant, if T is kept constant
Question 789. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
  1.    Possible
  2.    Possible, but with lot of sophistications
  3.    Impossible
  4.    Feasible
 Discuss Question
Answer: Option B. -> Possible, but with lot of sophistications
Question 790. Addition of heat at constant pressure to a gas results in
  1.    Raising its temperature and doing external work
  2.    Raising its volume
  3.    Raising its temperature
  4.    Raising its pressure
 Discuss Question
Answer: Option A. -> Raising its temperature and doing external work

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