Q3 of 269 Page 161

How long are the energy resources of the earth like coal, petroleum and natural gas expected to last?

Coal is expected to last for about 200 years,

Petroleum is expected to last for 40 years and


Natural Gas may last for 60 years


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1

Which of the two is a cleaner fuel: hydrogen or CNG? Why?

 2

Which of the two is more energy efficient : filament type electric bulb or CFL ? Why?

 4

Name two devices which can be utilized for the cooking of food so as to save fuel.

 5

What are the various factors which we should keep in mind while choosing a source of energy?