Question

31.List any three hazards of nuclear waste. How does the disposal of nuclear waste pose a problem for the plant and

animal life?

32. (a) Charcoal is a better fuel than wood. Why?

(b) How does biogas plant help to reduce the problem of pollution?

33. (a) How does construction of dams across the river get linked with production of greenhouse gases?

(b) How do technological inputs improve the efficiency of biomass fuels?

34. Mention any four limitations in harnessing wind energy on a large scale.

35. What happens when wood is burnt in a limited supply of oxygen? Name the residue left behind after the reaction and

state two advantages of using this residue as a fuel over wood.

36. Name four gases commonly present in biogas. State two advantages of using this gas over fossil fuels.

37. In a solar cooker, the following arrangements are made. Write one function of each arrangement.

(a) The box is made of insulating material such as plastic or wood.

(b) The inner walls of the box are painted black.

(c) The box is covered with a transparent glass sheet.

(d) A plane mirror is hinged at an angle at the top of the box.

38. Describe how hydro energy can be converted into electrical energy. Write any two limitations of hydro energy.

39. How has the traditional use of wind and water energy been modified for our convenience?

40. What are the limitations of the energy that can be obtained from the oceans?

41. Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?

42. What are the qualities of an ideal source of energy?

43. What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would

have limited utility?

44. What are the environmental consequences of the increasing demand for energy?

What steps would you suggest to reduce energy consumption?



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Answer 1

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