done 8th Science Coal and Petroleum

• question_answer1)
  What are the advantages of using CNG and LPG as fuels?
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• question_answer2)
  Name the petroleum product used for surfacing of roads.
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• question_answer3)
  Describe how coal is formed from dead vegetation. What is this process called?
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• question_answer4)
  Fill in the blanks: (a) Fossil fuels are ........................... and............... . (b) Process of separation of different constituents from petroleum is called................ (c) Least polluting fuel for vehicles is..............  
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• question_answer5)
  Tick true/false against the following statements. (a) Fossil fuels can be made in the laboratory. (b) CNG is more polluting fuel than petrol. (c) Coke is almost pure form of carbon. (d) Coal tar is a mixture of various substances. (e) Kerosene is not a fossil fuel.  
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• question_answer6)
  Explain why fossil fuels are exhaustible natural resources.                
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• question_answer7)
  Describe characteristics and uses of coke.
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• question_answer8)
  Explain the process of formation of petroleum.
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• question_answer9)
  The following table shows the total power shortage in India from 1991-1997. Show the data in the form of graph. Plot shortage percentage for the year on the y-axis and the year on  axis.

  S. No.	Year	Shortage (%)
  1	1991	7.9
  2	1992	7.8
  3	1993	8.3
  4	1994	7.4
  5	1995	7.1
  6	1996	9.2
  7	1997	11.5

     
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