NCERT Class 7 Science Chapter 18 Wastewater Story Extra Questions

NCERT Class 7 Science Chapter 18 Wastewater Story Extra Questions and Answers

Wastewater Story Extra Questions

Class 7 Science Chapter 18 Extra Questions and Answers – Wastewater Story. Here in this Page Class VII Students can Learn Extra Questions & Answer 18th Chapter Science fully Inside.

We Provided Here Wastewater Story Science Chapter 18 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).

Class 7 Science Chapter 18 Extra Question with Answer – Wastewater Story

Science Chapter 18 Wastewater Story Class 7 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.

1) Fill in the blanks:

a) Dried ___ is used as manure. (Sludge)

b) The wastewater released by home is ___. (Sewage)

c) Solids like feces are removed from water with a ___. (Scraper)

d) The microbes which cause dysentery are ___. (Protozoans)

2) Multiple choice questions:

a) A pipe carrying sewage is called ___?

a) Sewer b) Sewerage

Ans. a) Sewer

b) The bacteria which causes cholera is ___?

a) Salmonella paratyphi b) Vibrio cholera

Ans. b) Vibrio cholera

c) The large objects like rags, sticks etc are removed from wastewater by ___?

a) Bar screen b) Water clarifier

Ans. a) Bar screen

 

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d) ___ removes the floatable solids like oil and grease from water?

a) Scraper b) Skimmer

Ans. b) Skimmer

3) Answer the following questions:

a) What is sewage? Why we should plant eucalyptus trees all along sewage ponds?

Ans. Sewage is a liquid waste which causes water and soil pollution.

We should plant eucalyptus trees all along sewage ponds because these trees absorb all surplus wastewater rapidly and release pure water vapor into the atmosphere.

b) What are sullage waste and foul waste?

Ans. The sewage that removed from kitchen is called sullage waste.

The sewage that removed from toilets is called foul waste.

c) Why sanitation is must necessary at public places?

Ans. Railway stations, bus depots, airports, hospitals are very busy places. Thousands of people visit them daily. Large amount of waste is generated here. It must be disposed of properly otherwise epidemics could break out.

4) A very large fraction of our people defecates in the open, on dry riverbeds, on railway tracks, near fields and many a time directly in water. Untreated human excreta is a health hazard. It may cause water pollution and soil pollution. Both the surface water and groundwater get polluted. Groundwater is a source of water for wells, tube wells, springs and many rivers. Thus, it becomes the most common route for water borne diseases. They include cholera, typhoid, polio, meningitis, hepatitis and dysentery.

a) ___ is a source of water for wells, tube wells, springs and many rivers. (Groundwater)

b) Name two water borne diseases.

Ans. Two water borne diseases are cholera and typhoid.

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Updated: April 6, 2023 — 11:57 am

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