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

MCQ Tests with Answers for Class 7 Science Chapter 18

Q1

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.
Q2

Sewage is mainly a:

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

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

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

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

[A]. Chlorine
[B]. Washing soda
[C]. Silica
[D]. Coal
Q8

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.
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

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.
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

Which of the following is not a source of wastewater?

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

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

[A]. Nitrate
[B]. Phosphate
[C]. Urea
[D]. Metal salt
Q18

“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)
Q19

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
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

Vacuum toilets are usually used in:

[A]. Superfast trains
[B]. Cinema halls
[C]. Aeroplanes
[D]. Large ships
Q24

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
Q25

Which of the following are used for the safe disposal of human excreta in those areas where sewerage system does not exist and water supply is limited or not available at all?

[A]. Chemical toilets
[B]. Vacuum toilets
[C]. Septic tank toilets
[D]. Composting toilets

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Last Edited: June 13, 2023