Class 7 Science Chapter 13 MCQ (Multiple Choice Questions) of Wastewater Story in English Medium updated for CBSE Session 2025-26. 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 2025-26
Class: 7 | Science |
Chapter: 18 | Wastewater Story |
Contents: | MCQ Online Quiz with answers |
MCQ Tests with Answers for Class 7 Science Chapter 18
Q1
Sewage is mainly a:
[A]. Liquid waste
[B]. Solid waste
[C]. Gaseous waste
[D]. Mixture of solid and gas
Q2
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.
Q3
Which of the following is or are products of wastewater treatment?
[A]. Biogas
[B]. Sludge
[C]. Both biogas and sludge
[D]. Aerator
Q4
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.
Q5
Read the following sentences carefully, and choose the incorrect one:
[A]. Use water is waste water which can be recycled.
[B]. Wastewater is treated in a sewage treatment plant.
[C]. By products of wastewater treatment are sludge and biogas.
[D]. Sewage is a liquid waste which causes water pollution.
Q6
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
Q7
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.
Q8
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
Q9
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.
Q10
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.
Q11
Which is used in vermi processing toilets?
[A]. Cockroaches
[B]. Earthworms
[C]. Snail
[D]. Silkworms
Q12
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
Q13
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.
Q14
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
Q15
“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
Q16
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
Q17
“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)
Q18
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
Q19
Which of the following can be used to disinfect the clean water in a sewage treatment plant before releasing it into the distribution system?
[A]. Iodine and Ozone
[B]. Ozone and Oxygen
[C]. Ozone and Chlorine
[D]. Chlorine only
Q20
Which of the following is not a water-borne disease?
[A]. Cholera
[B]. Tuberculosis
[C]. Typhoid
[D]. Dysentery
Q21
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
Q22
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
Q23
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.
Q24
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
Q25
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.
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Last Edited: June 13, 2023