Science Question answer collection & Notes page number 6

51. How can you say that an individual can contribute or make a difference to the management of –(i) Forests and wildlife (ii) Water resources, and (iii) Coal and petroleum? - 52. Write the importance of electricity in our everyday life. - 53. List the properties of magnetic field lines. - 54. Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes? - 55. Debate the merits and demerits of each source and select the best source of energy on this basis. - 56. Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices. - 57. Compare and contrast fossil fuels and the sun source of energy. - 58. What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility? - 59. Fill in the blanks:(a) Horizontal rows are known as _____________. 2020 60. Match the column: (a) Vinegar (i) 2.3 cm 2020