9. Write four characteristics of a good source of energy?
10. Compare and contrast bio-mass and hydro electricity
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Explanation:
What are the characteristics of a good source of energy?
It should produce a large amount of energy per unit.
It must be economical and pollution-free.
It must be able to produce over a long period of time.
It must be easy to handle or carry and store.
It should be of low cost but high calorific value.
Both bio-mass and hydro electricity are renewable sources of energy. Biomass is obtained from dead plants and animal wastes whereas hydro electricity is obtained from energy stored in water at some height. Energy from both these sources can be obtained again and again.
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