Wastewater Story (CBSE Class-7 Science): Questions 1 - 7 of 23
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Question number: 1
» Wastewater Story » Waste Water Treatment Plant » Water Clarifier
Question
In secondary clarifier sludge is used as:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Manure |
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| b. | Construction materials |
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| c. | Fertilizers |
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| d. | All a. , b. and c. are correct |
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Question number: 2
» Wastewater Story » Waste Water Treatment Plant » Sludge
Question
Processes of sludge treatment are:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Solid Composting, Incinerating |
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| b. | Incinerating, Dewatering, solid composting |
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| c. | Dewatering, Solid composting |
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| d. | All a. , b. and c. are correct |
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Question number: 3
» Wastewater Story » Sanitation and Disease » Sanitation at Public Places
Question
The practice of open defecation leads to:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Contamination of sources of underground water like wells, tubewells |
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| b. | Soil Contamination |
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| c. | Contamination of water tables |
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| d. | All a. , b. and c. are correct |
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Question number: 4
» Wastewater Story » Sewage » Sewers and Sewerages
Question
The underground pipes, which carry away, dirty drainage water and waste matter from the house is called as:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Sewer |
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| b. | Sewerage |
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| c. | Gutter |
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| d. | Both a. and c. are correct |
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Question number: 5
» Wastewater Story » Waste Water Treatment Plant » Bar Screen
Question
Bar screen removes the:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Sludge |
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| b. | Coarse and floating solids from the sewage |
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| c. | Grit and sand removal |
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| d. | None of the above |
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Question number: 6
» Wastewater Story » Water, Our Lifeline » Cleaning of Water
Question
Cleaning water is the process of removing:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Suspended solids and gases from water |
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| b. | Undesirable chemicals from water |
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| c. | Biological contaminants from water |
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| d. | All a. , b. and c. are correct |
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Question number: 7
» Wastewater Story » Waste Water Treatment Plant » Grit and Sand Removal Tank
Question
In the wastewater treatment plant wastewater is passed after screening into the:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Grit and sand removal tank |
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| b. | Aeration |
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| c. | Sedimentation tank |
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| d. | None of the above |
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