71. Which alternative energy source is exhaustible?
72. Which of the following is a Non Renewable Resource of Energy?
73. Which of the following is a renewable resource of energy?
74. The group of solar cells joined together in a definite pattern is called a
75. Which of the following uses a Non Renewable Energy Source?
76. Solar cells work on the principle of
77. Wind and solar energy are examples of
78. Electrostatic precipitator is used to control the pollution of
79. Hydro-electric power is a:
80. Energy that is produced commercially from coal is called
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