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
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
Q2
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.
Q3
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.
Q4
Which of the following is or are products of wastewater treatment?
[A]. Biogas
[B]. Sludge
[C]. Both biogas and sludge
[D]. Aerator
Q5
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
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
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.
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
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
Q14
Which of the following is not a source of wastewater?
[A]. Sewers
[B]. Homes
[C]. Industries
[D]. Hospitals
Q15
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%.
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
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
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
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.
Q22
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
Q23
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.
Q24
Vacuum toilets are usually used in:
[A]. Superfast trains
[B]. Cinema halls
[C]. Aeroplanes
[D]. Large ships
Q25
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