MCQs: Fluoride is also added to water, which helps in preventing
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MCQs: The tanks that supply water to towns are built at
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MCQs: Polar ice caps are found near the
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MCQs: Oil can be poison for
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MCQs: The largest ocean on earth is
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MCQs: Desalination plant is very expensive because it
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MCQs: When algae grows on the surface of water, it prevents
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MCQs: The percentage of salty water is
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MCQs: As compare to hose for car washing, bucketing uses
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MCQs: The poison gets more concentrated as it moves through
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MCQs: In our body, percentage of water is
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MCQs: An addition of small dose of chlorine gas to the filtered water is known as
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MCQs: Skin diseases, eye infections and diarrhea are the examples of
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MCQs: The process in which water is passed through filter beds of sand and gravel to remove smaller particles of dust is called
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MCQs: The sea which joins the ocean is
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MCQs: Water of oceans and seas is
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MCQs: The average depth of the largest ocean is
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MCQs: Water can be kept pure if we throw
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MCQs: Fish in the ponds and lakes die because the algae
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MCQs: Huge strainers are used to
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