Discussion
Which of the following statements is not true ?
Answer: B
The untrue statement is The output power of solar cell is high.
A single solar cell produces only a small voltage (about 0.5 volt for a silicon cell) and a small power, and typical commercial cells convert only about 15-20% of the sunlight falling on them into electricity. That is why many cells are joined into panels and arrays.
The other statements are true. A solar cooker burns no fuel and so causes no pollution. Ocean thermal energy uses the temperature difference between warm surface water and cold deep water, whereas tidal energy uses the rise and fall of the tides. Nuclear plants do carry a risk of accidental radiation leakage, as Chernobyl and Fukushima showed.
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