Class 7 science Practice Tests
Class 7 Science Online Tests
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The MCQ: Fluoride is also added to water, which helps in preventing; "Water Treatment" App Download (Free) with answers infection, sickness, fever and tooth decay for online certificate programs. Solve importance of water quiz questions, download Google eBook (Free Sample) for online degree programs.
MCQ 1: Fluoride is also added to water, which helps in preventing
MCQ 2: The tanks that supply water to towns are built at
MCQ 3: An addition of small dose of chlorine gas to the filtered water is known as
MCQ 4: The process in which water is passed through filter beds of sand and gravel to remove smaller particles of dust is called
MCQ 5: Huge strainers are used to
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