1. Yusuf is studying water pollution. He knows that phosphates from detergents can cause problems. What is a major issue caused by phosphates in water?
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Ch 12
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2. Waseem is studying the disadvantages of natural substances found in water. He knows that some substances can be harmful. Which of the following is a harmful substance that can be found in water?
3. Ming is studying the disadvantages of natural substances in water. He knows that some substances can affect water quality. Which of the following is a disadvantage of phosphates in water?
4. Nora is studying water treatment. She knows that distilled water is used in laboratories. What is the main difference between distilled water and tap water?
5. Ming is comparing distilled water and tap water. He knows that distilled water is pure water. Which of the following is true about distilled water?
6. Which salt causes permanent hardness?
7. Fatima is studying water pollution from agriculture. She knows that fertilizers can run off into water bodies. What is a way to prevent fertilizer runoff?
8. Uma is studying water treatment. She knows that coagulation involves the addition of chemicals. What is the purpose of adding alum in coagulation?
9. Soft water is suitable for:
10. Bilal is studying the benefits of natural substances in water. He knows that some substances are beneficial. Which of the following is a benefit of dissolved oxygen in water?
11. David is studying the treatment of domestic water. He knows that raw water treatment involves several steps. What is the first step in the treatment of raw water?
12. Tina is learning about fertilizers and water pollution. She knows that excessive use of fertilizers can lead to water pollution. What is a way to reduce the negative effects of fertilizers on water?
13. Which practice helps prevent water-borne diseases?
14. Which household method improves drinking water quality?
15. Typhoid is a:
16. Which of the following is a physical pollutant of water?
17. Yusuf is studying ways to deal with water pollution. He knows that proper waste disposal is important. What is a proper way to dispose of household chemicals?
18. Khalid is studying the properties of water. He knows that water has a high specific heat capacity. What is the significance of high specific heat capacity?
19. George is studying the treatment of domestic water. He knows that chlorination is the final step. What is the purpose of chlorination?
20. Water is called a universal solvent because it:
21. Which state of water is less dense?
22. Clean water is essential mainly for:
23. Ibrahim is studying the effects of fertilizers on water quality. He knows that nitrates from fertilizers can enter water bodies. What is a disadvantage of nitrates in water?
24. Khalid is studying the treatment of domestic water. He knows that filtration is an important step. What is removed during the filtration process?
25. Water has maximum density at:
26. Fatima is studying the benefits of natural substances found in water. She knows that some minerals are beneficial for health. Which of the following is a benefit of natural substances in water?
27. Which parameter indicates the amount of salts dissolved in water?
28. Which activity increases water pollution?
29. George is learning about water pollution. He knows that plastics are a major pollutant in water bodies. What is a disadvantage of plastics in water?
30. Tina is studying the disadvantages of metals in water. She knows that certain metals are toxic. Which of the following is a toxic metal that can contaminate water?