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 Multiple Choice QuestionsMultiple Choice Questions

271.

For adiabatic process  γ = CpCV

  • pγV = constant

  • TpγV = constant

  • pVγ = constant

  • pV = constant


272.

A Carnot engine works between temperature 72°C and 27°C. The efficiency of the engine is

  • 70 %

  • 30 %

  • 0 %

  • 10 %


273.

Boyle's law is applicable for an

  • adiabatic process

  • isothermal process

  • isobaric process

  • isochoric process


274.

During adiabatic expansion, the volume of air increases by 4%. The percentage decrease in the pressure will be

  • 3.2 %

  • 5.6 %

  • 1.5 %

  • 4.8 %


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275.

Consider two containers P and Q containing identical gases at same temperature, pressure and volume. The gas in container P is compressed to half of its original volume isothermally while the gas in container Q is compressed to half of its original value adibatically. The ratio of final pressure of gas is

  • 2γ-1

  • 12γ-1

  • 11 - γ2

  • 1γ - 12


276.

A refrigerator is driven by 1000 W electric motor having an efficiency of 60%. The refrigerator is considered as a reversible heat engine operating between 273 K and 303 K. Time required by it to freeze 32.5 kg of water at 0°C is. (Given, latent heat of fusion of ice = 336 × 103 J-kg-1 and heat lost may be neglected).

  • 53 min 20 s

  • 33 min 20 s

  • 48 min 40 s

  • 28 min 32 s


277.

Work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically and in this process the temperature ofthe gas increases by 7° C. The gas is (R = 8.3 J mol-1 K-1 )

  • diatomic

  • triatomic

  • a mixture of monoatomic and diatomic

  • monoatomic


278.

Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion, the average time of collision between molecules increases to Vq , where V is the volume of the gas. The value of q is where γ = CpCV

  • 3γ + 56

  • 3γ - 56

  • γ + 12

  • γ - 12


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279.

An ideal heat engine exhausting heat at 27° C is to have 25% efficiency. It must take heat at

  • 127 °C

  • 227° C

  •  327° C

  • None of these


280.

Two spherical soap bubbles of radii r1 and r2 in vacuum combine under isothermal conditions. The resulting bubble has a radius equal to

  • r1 + r22

  • r1r2r1 + r2

  • r1r2

  • r12 + r22 


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