Class 7 Science e-Book's MCQs - Complete
Water Treatment Quiz App Free Download & e-Book - 356
Apps:
MCQ:
The process in which water is passed through filter beds of sand and gravel to remove smaller particles of dust is called
- coagulation
- sedimentation
- filtration
- chlorination
c
Class 7 Science App & e-Book Tests PDF Download
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7th Grade Science MCQs eBook Download
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