Class 7 Science Chapter 13 MCQ (Multiple Choice Questions) of Wastewater Story in English Medium updated for CBSE Session 2023-24. All the questions are important and useful of terminal exams and class tests. MCQs are design in such a way it covers the entire chapter 13 of class 7 science. There are about 60 questions in all divided into 10 MCQ online tests.

Class 7 Science Chapter 13 MCQ for 2023-24

Class: 7Science
Chapter: 18Wastewater Story
Contents: MCQ Online Quiz with answers

MCQ Tests with Answers for Class 7 Science Chapter 18


Which of the following is wastewater?

[A]. Water trickling from a damaged tap
[B]. Water coming out of a shower
[C]. Water flowing in a river
[D]. Water coming out of a laundry

Consider the following statements and choose the incorrect one:

[A]. Clean water is a basic necessity of our life.
[B]. The wastewater may also contain pieces of human excreta.
[C]. Use water or waste water could not be reused after cleaning it.
[D]. The cleaning of water is a process of removing pollutants harmful substances from it.

Sewage is mainly a:

[A]. Liquid waste
[B]. Solid waste
[C]. Gaseous waste
[D]. Mixture of solid and gas

Which of the following statement is or are incorrect?

[A]. The wastewater and faeces from homes and other buildings which is carried away in sewers, is called sewage.
[B]. The bacteria present in sewage include those bacteria which cause water-borne diseases such as cholera and typhoid.
[C]. An underground pipe which carries away dirty drainage water and waste water, is called a sewer.
[D]. None of the above.

Open drain system is a breeding place for which of the following?

[A]. Flies
[B]. Mosquitoes
[C]. Organisms which cause disease
[D]. All the above

Water polluted by various human activities cause a number of water-borne diseases. Which of the following is not a water-borne disease?

[A]. Cholera
[B]. Typhoid
[C]. Asthma
[D]. Dysentry

Arpit appeared in class test but he confused to know the correct statement. Would you help him to know that?

[A]. Open drain system is a breeding ground for flies, mosquitoes and organisms which spread diseases.
[B]. Waste water is produced in houses, industries, agricultural fields and other human activities which is known as sewage.
[C]. When underground sewage system and refuse disposal system not possible, the low cost on site sanitation system may be adopted.
[D]. All the above.

Which of the following statement is or are correct?

[A]. Water that is fit for use and safe for drinking is known as clean water.
[B]. The dissolved and suspended impurities present in water are called contaminants.
[C]. The gas that is produced by decomposition of sludge by the anaerobic bacteria is known as biogas.
[D]. All the above.

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. Bacteria which can grow and multiply in absence of free oxygen are called anaerobic bacteria.
[B]. Water which is cleared from the floatable substances like oil and grease by a skimmers is called clarified water.
[C]. Waste water solids like faeces, which settle down at the bottom of a large tank and are removed with a scraper are called sludge.
[D]. None of the above.

The full form of WWTP is:

[A]. World Wide Transport Programme
[B]. Waste Water Treatment Plant
[C]. World Workers’ Talent Programme
[D]. None of these.

Which is used in vermi processing toilets?

[A]. Cockroaches
[B]. Earthworms
[C]. Snail
[D]. Silkworms

Gunja is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Gunja wants to take help from you:

[A]. The wastewater or sewage entering the sewage treatment plant is the first passed through bar screens.
[B]. The wastewater passing through the bar screen is made to flow slowly through a tank called “grit and sand removal tank”.
[C]. The sludge is taken out from the bottom of first sedimentation tank and put into a large, closed tank called “digester tank”.
[D]. None of the above.

Which of the following is a good practice be followed?

[A]. Cooking oil and paint should not be thrown down a drain.
[B]. Used tea leaves, solid food and cotton should not be thrown in the drain.
[C]. Chemicals like insecticides should not throw in the drain.
[D]. All of the above

Which of the following is not a source of wastewater?

[A]. Sewers
[B]. Homes
[C]. Industries
[D]. Hospitals

“No one need to wait for anyone else to adopt a humane and enlightened course of action.” – said by:

[A]. Mahatma Gandhi
[B]. Pandit Jawaharlal Nehru
[C]. Sardar Vallabhbhai Patel
[D]. Subhas Chandra Bose

Which of the following is not an inorganic impurity present in sewage?

[A]. Nitrate
[B]. Phosphate
[C]. Urea
[D]. Metal salt

“By providing clean water and sanitation to the poorest people on the planet, we can reduce poverty and suffering and ensure education for all children.”— said by:

[A]. International Labour Organisation (ILO)
[B]. International Monetary Fund (IMF)
[C]. Food and Agricultural Organisation (FAO)
[D]. United Nations International Children’s Emergency Fund (UNICEF)

Which of the following organisms produce biogas from sludge in the digester tank of a wastewater treatment plant?

[A]. Anaerobic bacteria
[B]. Fungi
[C]. Aerobic bacteria
[D]. Protozoa

In this year board examination, Ajju were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

[A]. World Water Day 2020, on 22 March, is about water and climate change.
[B]. The theme of 2019 was about tackling the water crisis by addressing the reasons why so many people are being left behind
[C]. In 2017, the theme was “Why Waste Water?” which was about reducing and reusing wastewater.
[D]. All the above

Durgesh is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?

[A]. Waste cooking oils and fats should not be thrown in the kitchen sink to go down the drain.
[B]. The climate like paints, solvents, insecticides, medicines and motor oil etc., should not be thrown down the drain.
[C]. The wastes such as solid food remains, used tea leaves, sanitary towels, polythene bags used cotton, hair etc., should not be thrown the drains.
[D]. All the above

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. Untreated human excreta is a health hazard.
[B]. The untreated human excreta cause soil pollution and water pollution.
[C]. More than one billion people in the world do not get safe drinking water.
[D]. None of the above

One of the following type of trees are said to help in purifying wastewater quite rapidly when planted all along the sewage ponds. These are:

[A]. Eucalyptus tree
[B]. Ficus tree
[C]. Neem tree
[D]. Peepal trees

Which of the following statement is or are incorrect?

[A]. All the portable toilets are chemical toilets.
[B]. Septic tanks and composting pits are called on-site sewage facility.
[C]. Septic tanks are suitable for those places where there is no sewage system.
[D]. The human waste can not be used in a biogas plant for making biogas.

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. Poor sanitation in crowded public places can result in the spread of diseases.
[B]. Open dirty water drains are breeding place for flies, mosquitoes and other disease-causing organisms.
[C]. If all the wastes produced at public places are not disposed at of regularly and properly, even epidemics could break out.
[D]. Only the responsibility of the municipality of the area to maintain sanitization or hygienic condition.

Consider the following statements and choose the correct one:

[A]. We should never urinate on the roadside.
[B]. We should not spit in public places.
[C]. After eating a banana, we should not throw banana peels on the road side.
[D]. All the above

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Last Edited: June 13, 2023