Match the two columns: Column A Column B 1. Wastewater (i) Cholera 2. Sludge (ii) On site sewage disposal system 3. Water-borne disease (iii) Used water 4. Septic tank (iv) Remove large objects like rags, sticks and plastic bags 5. Bar screens (v) Solid material generated from sewage treatment (vi) Tuberculosis

1. Wastewater (i) Used water Wastewater is used water. It includes substances such as human waste, food scraps, oils, soaps, and chemicals. In homes, this includes water from sinks, showers, bathtubs, toilets, washing machines, and dishwashers. 2. Sludge (ii) Solid material generated from sewage treatment Sludge is the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. 3. Water-borne disease (iii) Cholera Cholera is an infectious disease that causes severe watery diarrhea, which can lead to dehydration and even death if untreated. It is caused by eating food or drinking water contaminated with bacteria. 4. Septic tank (iv) Onsite sewage disposal system A septic tank is an underwater sedimentation tank used for wastewater treatment through the process of biological decomposition and drainage. Septic tanks allow safe disposal of wastewater and hence are widely popular in areas that have a poor drainage system. 5. Bar screens (v) Remove large objects like rags, sticks and plastic bags A bar screen is a mechanical filter used to remove large objects, such as rags and plastics, from wastewater. Column A Column B 1. Wastewater (i) Used water 2. Sludge (ii) Solid material generated from sewage treatment 3. Water-borne disease (iii) Cholera 4. Septic tank (iv) Onsite sewage disposal system 5. Bar screens (v) Remove large objects like rags, sticks and plastic bags

E M B I B E

Start Up Science 7>Chapter 18 - Waste Management>EXERCISES FOR FORMATIVE AND SUMMATIVE ASSESSMENT>Q C

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7th CBSE

IMPORTANT

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Dried sludge can be used as manure.

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Important Questions on Waste Management

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7th CBSE

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Start Up Science 7>Chapter 18 - Waste Management>EXERCISES FOR FORMATIVE AND SUMMATIVE ASSESSMENT>Q C

Contamination of drinking water can happen in covered drains also.

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Start Up Science 7>Chapter 18 - Waste Management>EXERCISES FOR FORMATIVE AND SUMMATIVE ASSESSMENT>Q C

Chemical products such as medicines, motor oils, paints, grease, machine oils and insecticides may kill water-purifying microorganisms and accelerate the degradation process.

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7th CBSE

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Start Up Science 7>Chapter 18 - Waste Management>EXERCISES FOR FORMATIVE AND SUMMATIVE ASSESSMENT>Q C

Match the two columns:

	Column A		Column B
1.	Wastewater	(i)	Cholera
2.	Sludge	(ii)	On site sewage disposal system
3.	Water-borne disease	(iii)	Used water
4.	Septic tank	(iv)	Remove large objects like rags, sticks and plastic bags
5.	Bar screens	(v)	Solid material generated from sewage treatment
		(vi)	Tuberculosis