91. The source of the Sun's energy is the process of
92. Hot springs are heated geothermally by underlying
93. Which of the following is the cleanest source of energy?
94. The Solar energy produced by
95. The oldest type of energy known to man is
96. The energy emitted by the Sun is due to
97. Where does hydroelectric energy come from?
98. Which colour has the highest energy?
99. Red is used as an emergency or danger signal as
100. Which of these travels in glass with minimum velocity ?
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