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  3. 5th Class
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5th Class Science Sample Paper Science Olympiad Model Test Paper-12

  • question_answer
    Which of these is a natural cause of air pollution?

    A) Volcanic eruption

    B) Burning of non-biodegradable substances

    C) Smoke from factories

    D) Burning of fossil fuel

    E) None of these

    Correct Answer: A

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