Class 7 Science MCQs (Grade 7) From Textbook
Importance of Water MCQ App Download (Free) | Class 7 Science e-Book PDF
Class 7 Science MCQs – Practice Test 2 (Chapter 13)
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Desalination plant is very expensive because it
When algae grows on the surface of water, it prevents
The percentage of salty water is
As compare to hose for car washing, bucketing uses
The poison gets more concentrated as it moves through
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