Q. 27. Differentiate between renewable and non-renewable sources of energy. Give two example of each.
Q. 28. What is wind energy? Write its application and limitations:
Q. 29. Describe how electricity is produced in hydroelectric power plants. State the constraints and disadvantages associated with it.
Q. 30. What is geothermal energy? How is it harnessed? Write its advantages over conventional energy.
Q. 31. What is bio-mass? Mention any two sources of biomass? Which are uses as fuels.
Q. 32. What is you understand by smokeless chulha? Write the advantages of a smokeless chulha over the traditional chulha.
Q. 33. Write the laboratory procedure for the preparation of charcoal. Why charcoal is a better fuel than wood?
Q. 34. Explain the composition of sunlight. What is meant by infra-red-rays and ultra vivlet rays? Give characteristic properlies of each. Write the application of intra-red-rays.
Q. 35. What are differences between ultra-violet and infra-red light?
Q. 36. How can solar energy be harnessed? Describe the construction and working of a solar cooler.
Q. 37. With the help of a diagram, explain the working of a solar water heater.
Q. 38. What is a solar cell? Explain why solar cell have gained so much importance.
Q. 39. What are semi-conductors? Explain the principle of working of a solar cell made of semiconductor. Why are solar cell panels used in artificial satellite?
Q. 40. What is biogas? Name the major constituents of biogas. Describe the practical designs of bio-gas plants.
Q. 41. Mention five characteristics of an ideal fuel. Why is bio-gas considered an idea fuel for domestic use? Why is hydrogen not used as a domestic fuel?
Q. 42. A biogas plant solve the fuel as well as the environ mental problem. Discuss.
Q. 43. What are fossil fuels? Give examples. Describe the process of formation of fossil fuels.
Q. 44. What is LPG? State its composition, properties and applications. State the precautions to be observed when lighting an LPG stove.
Q. 45. What are the conditions necessary for combustion? Explain with examples.
