Chapter 14: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 14
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MCQ 81: Waste chemicals and harmful metals like mercury make the water
MCQ 82: Poisonous substances from landfills can be washed away into rivers by
MCQ 83: One of the most common water washed diseases is known as
MCQ 84: A cow drinks approximately
MCQ 85: The taste of 'water' is
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