Class 7 Science Chapter 13 MCQ (Multiple Choice Questions) of Wastewater Story in English Medium updated for CBSE Session 2024-25. 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 2024-25

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

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.

Which of the following is or are products of wastewater treatment?

[A]. Biogas
[B]. Sludge
[C]. Both biogas and sludge
[D]. Aerator

Rupali is writing some statements, choose the incorrect statement and help her:

[A]. The sewage released by houses and other buildings contain a large number of harmful substances and a disease-causing microorganism.
[B]. Drinking of water contaminated with sewage, spread disease in people which can even lead to death.
[C]. The discharge of untreated sewage into rivers can also kill fish and other aquatic animals.
[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

Pick from the following one chemical which is used to disinfect water?

[A]. Chlorine
[B]. Washing soda
[C]. Silica
[D]. Coal

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

[A]. Sewers
[B]. Sewerage
[C]. Transport system
[D]. Treatment plant

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 of the following is a part of inorganic impurities of the sewage?

[A]. Pesticides
[B]. Urea
[C]. Phosphate
[D]. Vegetable waste

Which is used in vermi processing toilets?

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

In a filtration plant, water is filtered using layers of:

[A]. Sand and clay
[B]. Clay and fine gravel
[C]. Sand and fine gravel
[D]. Sand, fine gravel and medium gravel

Select the one that is incorrect for wormy processing toilet:

[A]. It is a new method and has been recently tested in India.
[B]. In it the human excreta are treated by cockroaches and round worms.
[C]. In it the human excreta are completely converted into vermi-cakes.
[D]. It is an ideal, low water use toilet that is safe for processing of human waste.

“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 statements about ozone are correct?

[A]. It is essential for breathing of living organisms and it is used to disinfect water.
[B]. It is used to disinfect water and it absorbs ultraviolet rays.
[C]. It is essential for breathing of living organisms and it absorbs ultraviolet rays.
[D]. It is used to disinfect water and its proportion in air is about 3%.

The General Assembly of United Nation on the World Water Day on 22nd march 2005 has declared the period as the international decade for action on:

[A]. Water for Life
[B]. Nature for Water
[C]. Water and Disaster
[D]. Water for Future

“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

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.

The examples of onsite sewage disposal system for human waste are:

[A]. Septic tanks
[B]. Composting pits and
[C]. Chemical toilets.
[D]. All the above

Vacuum toilets are usually used in:

[A]. Superfast trains
[B]. Cinema halls
[C]. Aeroplanes
[D]. Large ships

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