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Q1. Distinguish between renewable and non renewable sources of energy and give two examples of each.

Q2. Why is wood not used as a fuel although forests can be replenished?

Q3. Why are fossil fuels considered as non renewable sources of energy?

Q4. Name the major fuel component of bio gas. What are its other combustible components? Draw the diagram of a fixed dome type bio gas plant and also explain its functioning. What is the use of the slurry which is left and why?

Q5. Name the largest component of the bio gas. Why is it also called gobar gas?

Q6. What is a solar cell? Name two materials which are mostly used in the fabrication of solar cells.

Q7. Draw the diagram of a box type solar cooker. What is the function of the blacked surface, glass cover plate and the mirror in the solar cooker. What would happen if we replace the glass mirror with a concave glass mirror?

Q8. What is geothermal energy? Write its advantages and disadvantages.

Q9. a)Draw the diagram of a fixed dome type bio gas plant.
b) Write any two uses of bio gas.

Q10. Compare the nuclear energy to electric energy and thermal energy is being eco friendly.

Q11. Explain the generation of energy in a hydro power plant.

Q12. What prevents us from using solar cells for domestic uses.

Q13. How can we harness wind and hydro energy?

Q14. Give 2 examples of fossil fuels.

Q15. Mention any 4 places where solar cells are used for generation of energy.

Q16. Name two energy sources which can be considered renewable and two which are non
renewable sources, also state reasons to support your answer.

Q17. Classify the following as renewable and nonrenewable sources of energy.
Coal, wind, tides, petroleum, wood, bio gas what is the basis of this classification?

Q18. Explain the principle of thermal and hydro energy.