Home
Class 11
PHYSICS
If an electric fan be switched on in a c...

If an electric fan be switched on in a closed room, will the air of the room be cooled? If not, why do we feel cold?

Text Solution

Verified by Experts

No, rather the air will be heated, because due to motion of the fan, the speed of air molecules will increase. Infact, we feel cold due to evaporation of our sweat.
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    PRADEEP|Exercise Long answer questions|11 Videos

  • THERMODYNAMICS

    PRADEEP|Exercise Advanced problems for competitions|10 Videos

  • THERMODYNAMICS

    PRADEEP|Exercise Very short answer questions|31 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    PRADEEP|Exercise Assertion- Reason Type questions|20 Videos

  • WORK, ENERGY AND POWER

    PRADEEP|Exercise Assertion-Reason Type Questions|24 Videos

Similar Questions

Explore conceptually related problems

Assertion : If an electric fan be switched on in a closed room, the air of the room will be cooled. Reason : Fan air decrease the temperature of the room.

Statement- 1 : When an electric fan is switched on in a closed room, the air of the room is cooled. Statement- 2 : When fan is switched on, the speed of the air molecules will increase.

Why dust generally sttles down in a closed room?

PRADEEP-THERMODYNAMICS-Short answer questions
  1. Is the equation PV=RT valid for both, isothermal and adiabatic changes...

    Text Solution

    |

  2. A gas expands in such a way that PV^(2)= constant. Will the gas cool g...

    Text Solution

    |

  3. The temperature of the surface of sun is about 6000K. Can we produced ...

    Text Solution

    |

  4. If an electric fan be switched on in a closed room, will the air of th...

    Text Solution

    |

  5. Which one among a solid, liquid and gas of same mass and at the same t...

    Text Solution

    |

  6. A thermos flask contains coffee. It is shaken vigorously. (i) Has any ...

    Text Solution

    |

  7. By what method can the internal energy of an ideal gas be changed?

    Text Solution

    |

  8. Internal energy of a compressed gas is less than that of a rarefield g...

    Text Solution

    |

  9. On a hot summer day we want to cool our room by opening the refrigerat...

    Text Solution

    |

  10. Discuss whether the following phenomena are reversible? (i) Water fa...

    Text Solution

    |

  11. Is the efficiency of a heat engine more in hilly areas than in plains?

    Text Solution

    |

  12. To increase the efficiency of a carnot engine, will you prefer to (i) ...

    Text Solution

    |

  13. Give briefly the concept of internal energy.

    Text Solution

    |

  14. Define the four thermodynamic processes. What is meant by indicator di...

    Text Solution

    |

  15. State the sign conventions used in all thermodynamic processes?

    Text Solution

    |

  16. What do you learn by applying first law of thermodynamics to isotherma...

    Text Solution

    |

  17. Show that the slope of p-V diagram is greater for an adiabatic process...

    Text Solution

    |

  18. Discuss work done in an isothermal/adiabatic process in terms of indic...

    Text Solution

    |

  19. Briefly discuss the limitations of first law of thermodynamics.

    Text Solution

    |

  20. State second law of thermodynamics.

    Text Solution

    |