21. |
Which of the following is a disadvantage of renewable energy?
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Answer:
Option (d) |
22. |
Which fuel having the highest calorific value?
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Answer:
Option (a) |
23. |
Which of the following is not the correct impact of global warming?
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Answer:
Option (b) |
24. |
Which of the following is not a cause of global warming?
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Answer:
Option (a) |
25. |
The function of the ozone layer is
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Answer:
Option (a) |