A mass of diatomic gas  at a pressure of 2 atm is compressed a

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91.

A mass of diatomic gas left parenthesis straight gamma space equals space 1.4 right parenthesis at a pressure of 2 atm is compressed adiabatically so that its temperature rise from 27oC to 927o C. The pressure of the gas is final state is 

  • 28 atm

  • 68.7 atm

  • 256 atm

  • 256 atm


C.

256 atm

T1 = 273 + 27 = 300k
T2 = 273+927 = 1200 K
Gas equation for adiabatic process

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92.

If ΔU and ΔW represent the increase in internal energy and work done by the system respectively in the thermodynamical process, which of the following is true?

  • ΔU = - ΔW, in a adiabatic process

  • ΔU = ΔW, in an isothermal process

  • ΔU = ΔW, in an adiabatic process

  • ΔU = ΔW, in an adiabatic process

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93.

A monatomic gas at pressure p1 and V1 is compressed adiabatically to 1/8 th its original volume. What is the final pressure of the gas?

  • 64 p1

  • p1

  • 16 p1

  • 16 p1

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94.

The internal energy change in a system that has absorbed 2 Kcal of heat and done 500 J of work is 

  • 8900 J

  • 6400 J

  • 5400 J

  • 5400 J

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95.

In a thermodynamic process which of the following statements is not true?

  • In an adiabatic process, the system is insulated from the surroundings

  • In an isochoric process pressure remains constant

  • In an isothermal process, the temperature remains constant

  • In an isothermal process, the temperature remains constant

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96.

If Q, E andW denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then

  • W =0

  • Q = W = 0

  • E=0

  • E=0

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97.

In producing chlorine through electrolysis 100 W power at 125 V is being consumed. How much chlorine per min is liberated? ECE of chlorine is 0.367 x 10-6 kg/C

  • 17.6 mg

  • 21.3 mg

  • 24.3 mg

  • 24.3 mg

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98.

A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency?

  • 275 K

  • 175 K

  • 250 K

  • 250 K

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99.

The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio of specific heat at constant pressure to that at constant volume is

  • 7/5

  • 8/7

  • 5/7

  • 5/7

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100.

Two rods A and B of different materials are welded together as shown in the figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be

  • fraction numerator straight K subscript 1 space plus space straight K subscript 2 over denominator 2 end fraction
  • fraction numerator 3 space left parenthesis straight K subscript 1 space plus space straight K subscript 2 right parenthesis over denominator 2 end fraction
  • k1 + k2

  • k1 + k2

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