Home
Class 12
PHYSICS
Even Carnot engine cannot give 100% effi...

Even Carnot engine cannot give `100%` efficiency because we cannot

A

reach absolute zero temperature

B

find ideal sources

C

eliminate friction

D

prevent radiation

Text Solution

Verified by Experts

The correct Answer is:
A
`eta=1-Q_(2)/Q_(1)=1-T_(2)/T_(1)`
For 100% efficiency, either `T_(2)=0orT_(1)=infty`
(This option is not given)
But we cannot reach absolute zero of temperature. Hence 100% efficiency is not possible.
Promotional Banner

Topper's Solved these Questions

  • KINETIC THEORY OF GASES ,THERMODYNAMICS AND RADIATION

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 9|30 Videos

  • INTERFERENCE AND DIFFRACTION

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|20 Videos

  • MAGNETIC EFFECTS OF ELECTRIC CURRENT

    MARVEL PUBLICATION|Exercise MCQ|195 Videos

Similar Questions

Explore conceptually related problems

Even carnot heat engine cannot give 100% efficiency. Explain why OR can you design a heat engine of 100% efficiency? Explain ypur answer. OR A heat engine with 100% efficiency is only a theoretical possibility. Explain.

Explain why a Carnot engine cannot have 100% efficiency?

Efficiency of Carnot engine is 100% if

Assertion: The efficiency of a carnot engine cannot be 100% . Reason: This is because sink of heat engine cannot be maintained at 0 K .

A fritionless heat engine can be 100% efficient only if its exhaust temperature is

An ideal heat engine can be 100% efficient if its sink is at

Assertion: Efficiency of a heat engine can't be greater than efficiency of Carnot engine. Reason: Effieciency of any engine is never 100%

Why can't a machine be 100% efficient?

A carnot engine has an efficiency of 30% .Its efficiency is to be increased to 50% .By what must the temperature (in K) of the source be increased if the sink is at 300K ?

MARVEL PUBLICATION-KINETIC THEORY OF GASES ,THERMODYNAMICS AND RADIATION-TEST YOUR GRASP - 9
  1. Even Carnot engine cannot give 100% efficiency because we cannot

    Text Solution

    |

  2. The velocities of 4 molecules are 4m/s, 5m/s, 6m/s and 2m/s respective...

    Text Solution

    |

  3. Oxygen and hydrogen gas are at same temperature and pressure. And the ...

    Text Solution

    |

  4. The mean free path of nitrogen molecules at 27^(@)C is 3xx10^(-7)m//s....

    Text Solution

    |

  5. The equation of state for 15 gram of oxygen at pressure P, volume V an...

    Text Solution

    |

  6. The rms velocity of the molecules of a gas at temperature T is 1200 m/...

    Text Solution

    |

  7. If atmospheric pressure P=1xx10^(5)N//m^(2)andR=8J//"mole"//""^(@)K, t...

    Text Solution

    |

  8. At what temperature is the K.E. Of a gas molecules half that of its va...

    Text Solution

    |

  9. Each molecule of a gas has F degrees of freedom . The ratio (C(p))/(C(...

    Text Solution

    |

  10. Argon gas is heated at constant volume through 1^(@)C. The heat suppli...

    Text Solution

    |

  11. C(v) denotes the molar specific heat of a gas at constant volume and g...

    Text Solution

    |

  12. One mole of a monoatomic ideal gas is mixed with one mole of a diato...

    Text Solution

    |

  13. Which one of the following is not true about the following thermodynam...

    Text Solution

    |

  14. During an adiabatic process, the pressure of gas is found to be propor...

    Text Solution

    |

  15. The difference between the principal specific heats of a gas is 300J/k...

    Text Solution

    |

  16. When the temperature of 4 moles of a gas was increased from 80^(@)C to...

    Text Solution

    |

  17. 100g of water is heated from 30^@C to 50^@C. Ignoring the slight expan...

    Text Solution

    |

  18. The temperature of sink of Carnot engine is 27^(@)C. Efficiency of eng...

    Text Solution

    |

  19. In an ideal refrigerator, heat from inside at 280 K is transferred to ...

    Text Solution

    |

  20. Which one of the following statements is true in the case of radiation...

    Text Solution

    |

  21. A perfectly black sphere of diameter 0.2 m is in thermal equilibrium w...

    Text Solution

    |