1. How have fossil fuels been formed?
2. Why are fossil fuels non-renewable sources of energy?
3. Why is a smelling agent added to LPG?
4. Give one reason why LPG is a better fuel than coal.
5. Give one advantage of modem chullah over traditional chullah.


1. Fossil fuels have been formed by the decomposition of pre-historic plants and animals buried under the Earth’s crust millions of years ago.
2. Fossil fuels are non-renewable sources of energy because once exhausted they cannot be re-created in a short period of time.
3. A smelling agent is added to LPG to detect the leakage of gas as LPG is colourless and odourless gas.
4. LPG is a better fuel than coal because of the following reasons:
  • It does not cause pollution.
  • It has a high calorific value.
  • It has a low ignition temperature.
5. Advantages of Modem Chullah over Traditional Chullah :
  • It has high efficiency.
  • It causes less pollution.
  • It consumes less fuel.

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Updated on: 16-Mar-2023

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