The molar specific heats of an ideal gas at constant pressure an

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81.

A thermodynamic system undergoes cyclic process ABCDA as shown in the figure. The work done by the system in the cycle is:

  • po Vo

  • 2 po Vo

  • zero

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82.

One mole of an ideal gas goes from an initial state A to final state B via two processes. It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct p-V diagram representing the two processes is

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83.

A thermodynamic system is taken through the cycle ABCD as shown in a figure. Heat rejected by the gas during the cycle is

  • 2 pV

  • 4 pV

  • 1/2 pV

  • 1/2 pV

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84.

The molar specific heats of an ideal gas at constant pressure and volume are denoted by CP and CV respectively. If straight gamma space equals space straight C subscript straight P over straight C subscript straight V and R is the universal gas constant, then CV is equal to

  • fraction numerator 1 plus straight gamma over denominator 1 minus straight gamma end fraction
  • fraction numerator straight R over denominator straight gamma space minus 1 end fraction
  • fraction numerator left parenthesis straight gamma minus 1 right parenthesis over denominator straight R end fraction
  • fraction numerator left parenthesis straight gamma minus 1 right parenthesis over denominator straight R end fraction


B.

fraction numerator straight R over denominator straight gamma space minus 1 end fraction

The value of Cv

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85.

A gas is taken through the cycle A → B → C → A, as shown, What is the net work done by the gas?


  • 2000 J

  • 1000 J

  • Zero

  • Zero

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86.

During an adiabatic process, the pressure of a gas found to be proportional to the cube of its temperature. The ratio of Cp/Cv for the gas is

  • 4/3

  • 2

  • 5/3

  • 5/3

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87.

When 1 kg of ice at 0oC  melts to water 0oC, the resulting change in its entropy, taking latent heat of ice to be 80 cal/oC, is

  • 8 x 104 cal /K

  • 80 cal/K

  • 293 cal/ K

  • 293 cal/ K

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88.

During an isothermal expansion, a confined ideal gas does - 150 J of work against its surroundings. This implies that

  • 300 J of heat has been added to the gas

  • no heat is transferred because the process is isothermal

  • 150 J of heat has been added to the gas

  • 150 J of heat has been added to the gas

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89.

4.0 g of a gas occupies 22.4 L at NTP. The specific heat capacity of the gas at constant volume is 5.0 JK-1 mol-1. If the speed of sound in this gas at NTP is 952 ms-1, then the heat capacity at constant pressure is.
(Take gas constant R = 8.3 Jk-1 mol-1)

  • 8.0 JK-1mol-1

  • 7.5 JK-1mol-1

  • 7.0 JK-1mol-1

  • 7.0 JK-1mol-1

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90.

An ideal gas is compressed to half its initial volume by means of several process. Which of the process results in the maximum work done on the gas?

  • Adiabatic

  • Isobaric

  • Isochoric 

  • Isochoric 

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