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Do all objects get charged by rubbing?


Only insulators (materials which do not conduct electricity) can be charged by rubbing, that is by providing friction.


The earth’s plate responsible for causing earthquakes is

(a) the crust of the earth          

(b) the mantle of the earth

(c) the inner core of the earth

(d) the outer core of the earth



(a) the crust of the earth

 Earthquakes are caused by tectonic movements in the Earth's crust.



As per convention, what is the charge on a glass rod when it is rubbed with silk cloth?

  1. Positive
  2. Negative
  3. Either 'a' or 'b'
  4. No charge



  1. Positive

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Chapter 15 Class 8 - Some Natural Phenomena

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.