Water Treatment MCQ App Download | Class 7 Science PDF e-Book
Class 7 Science Practice Test: MCQs for Exam Prep
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Fluoride is also added to water, which helps in preventing
The tanks that supply water to towns are built at
An addition of small dose of chlorine gas to the filtered water is known as
The process in which water is passed through filter beds of sand and gravel to remove smaller particles of dust is called
Huge strainers are used to
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