4th Class Science Sample Paper Science Olympiad Model Test Paper-18

  • question_answer
    Choose the correct statement from the following.

    A) Burning of fuels like coal, petrol produce oxygen on burning.

    B) Fertilizers and chemicals from agricultural fields when get mixed with river water cleans the water.

    C) Harmful substance which pollutes air, water and land is called pollution.

    D) The harmful substances which pollute air, water and land are called pollutants.

    E) None of these

    Correct Answer: D


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