Home
Class 7
PHYSICS
Give reason. : A crackling sound is hea...

Give reason. :
A crackling sound is heard when we take off wollen clothes during winter but it is not observed if we take off cotton clothes.

Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF NATURAL RESOURCES

    TARGET PUBLICATION|Exercise SOLVED|76 Videos

Similar Questions

Explore conceptually related problems

Give scientific reasons: We feel tired when we do exercise.

Give reasons : The loud explosions taking place on the surface of the Sun cannot be heard on the earth.

We observe that land becomes barren soon after monsoon. But in the next monsoon it flourishes again with varieties we observed in season earlier. How you think it takes place?

Give Scientific Reason : We cannot use the optical telescope during the day.

Give reasons : Why does your mother put folded cloth strips soaked in cold water on your forehead when you have high fever ?

In airfoil, the streamline are crowed above the wings of aeroplane more than those below it. This causes (during take off)

TARGET PUBLICATION-STATIC ELECTRICITY-SOLVED
  1. Refer the apparatus and procedure given on textbook page no. 53. Rcord...

    Text Solution

    |

  2. To charge an object by contact. : Rub a plastic comb against paper. T...

    Text Solution

    |

  3. To charge an object by induction. : Rub a comb or a balloon on your h...

    Text Solution

    |

  4. Keep a spent tubelight in a dark place. Rub it vigorouly with a thin p...

    Text Solution

    |

  5. Oral work : When do we say that asn object is electrically neutral?

    Text Solution

    |

  6. Oral work : When is an object said to be charged?

    Text Solution

    |

  7. Oral work : Why should the experiments of static electricity be perfo...

    Text Solution

    |

  8. Oral work : Which device is used to detect the electric charge on an ...

    Text Solution

    |

  9. Oral work : Name the device installed on the top of the buildings to ...

    Text Solution

    |

  10. Activities : Find out where is the concept os static electricity used...

    Text Solution

    |

  11. Fill in the blanks. : In …………….. Objects, the positive and negative c...

    Text Solution

    |

  12. Fill in the blanks. : Two like charges push each other away. This cal...

    Text Solution

    |

  13. Fill in the blanks. : Each atom is electrically …………

    Text Solution

    |

  14. Fill in the blanks. : Benjamin Franklin conducted an experiment of fl...

    Text Solution

    |

  15. Fill in the blanks. : When a charged object is brought near to a neut...

    Text Solution

    |

  16. Odd one out. : Copper, plastic, cotton, nylon.

    Text Solution

    |

  17. Odd one out. : Bringing rubbed silk cloth near neutral glass rod, bri...

    Text Solution

    |

  18. Distinguish between Charging by Conduction and Charging by Induction.

    Text Solution

    |

  19. Give reason. : A crackling sound is heard when we take off wollen clo...

    Text Solution

    |

  20. Give reason. : There is a provision for pouring water into the pit of...

    Text Solution

    |