Chapter 14: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 14
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MCQ 61: In sewage treatment plants, large material is removed by
MCQ 62: Desalination plants are used to convert
MCQ 63: The population which does not have tap water in their homes, is
MCQ 64: Water can be kept clean by detergents, if they are
MCQ 65: 'Distillation' can also be used to treat
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