Chapter 15 Some Natural Phenomena

  • Some objects can be charged by rubbing with other objects.
  • There are two kinds of charges: positive and negative.
  • Like charges repel and unlike charges attracts.
  • The process of transfer of charge from the charged object to the earth is called earthing.
  • The process of electric discharge between clouds and the earth or between different clouds causes lightening.
  • Lightening conductors can protect building from the lightening effects.
  • Earthquake is caused by the disturbance inside the crust.
  • Destructive energy of an earthquake measured on Richter scale. The earthquake measuring one or more on Richter scale can cause damage to life and property.
  • Earthquake generally occurs at the boundaries of the Earth’s plate. These boundaries are called as fault zone.
  • Topmost layer of the earth is called as crust.
  • Discharge may be defined as the transmission of electricity through a medium in an applied electric field.
  • Electroscope is an instrument which is used to detect the presence of the electric charge on body.
  • In a dark sky, on a rainy day, when a shiny streak of light appears accompanied with the thunder is called as lightening. 
  • An instrument which is used to record the details of earthquake is known as seismograph.
  • Sound caused by the lightening is called as thunder.
  • A storm with lightning and thunder is known as thunderstorm.
  • The giant waves which are caused by earthquake or volcanic eruptions under the sea called as tsunami.  

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Exercise 1 ( Page No. : 199 )

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