We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 18 Wastewater Story with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Wastewater Story Class 7 MCQs Questions with Answers here along with a detailed explanation.
Wastewater Story Class 7 MCQs Questions with Answers
Choose the correct option.
Question 1.
Water that is not fit for use is called
(a) clean water
(b) wastewater
(c) both (a) and (b)
(d) none of these
Answer
Answer: (b) wastewater
Question 2.
Which of the following is not a source of wastewater?
(a) Sewers
(b) Homes
(c) Industries
(d) Hospitals
Answer
Answer: (a) Sewers
Question 3.
The period of International Decade for action on ‘Water for Life’ is
(a) 2000-2010
(b) 2005-2015
(c) 2010-2020
(d) 2003-2013
Answer
Answer: (b) 2005-2015
Question 4.
The process of removing pollutants in water before it enter a water body is called
(a) cleaning of water
(b) refining
(c) filtering of water
(d) none of these
Answer
Answer: (a) cleaning of water
Question 5.
Which of the following is a part of inorganic impurities of the sewage?
(a) Pesticides
(b) Urea
(c) Phosphates
(d) Vegetable waste
Answer
Answer: (c) Phosphates
Question 6.
Wastewater released by homes, factories, industries and other users is known as
(a) polluted water
(b) sewage
(c) both (a) and (b)
(d) none of these
Answer
Answer: (b) sewage
Question 7.
Suspended impurities contained by sewage are called
(a) contaminants
(b) sludge
(c) grey water
(d) none of these
Answer
Answer: (a) contaminants
Question 8.
A network of big and small pipes under the ground for wastewater management is known as
(a) sewage
(b) sewerage
(c) manhole
(d) channel
Answer
Answer: (b) sewerage
Question 9.
Solid waste extracted during sewage treatment is known as
(a) sewage
(b) sludge
(c) biogas
(d) contaminants
Answer
Answer: (b) sludge
Question 10.
Which portion of WWTP retains large objects like rags, sticks, etc.?
(a) Bar screen
(b) Sludge
(c) Sedimentation tank
(d) Sewerage
Answer
Answer: (a) Bar screen
Question 11.
Name the scraper that removes solids like forced from the wastewater.
(a) Skimmer
(b) Sludge
(c) Tank
(d) All of these
Answer
Answer: (b) Sludge
Question 12.
The equipment that removes floatable particles from wastewater is
(a) sludge
(b) bar screen
(c) skimmer
(d) sedimentation tank
Answer
Answer: (c) skimmer
Question 13.
The tree that helps in wastewater treatment by absorbing water greatly and releasing pure water in environment through transpiration is
(a) peepal
(b) banyan
(c) eucalyptus
(d) banana
Answer
Answer: (c) eucalyptus
Question 14.
Which of the following is a step of wastewater treatment?
(a) Aeration
(b) Chlorination
(c) Filtration
(d) All of these
Answer
Answer: (d) All of these
Question 15.
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
Answer
Answer: (d) Sand, fine gravel and medium gravel
Question 16.
Open drain system is a breeding place for which of the following?
(a) Flies
(b) Mosquitoes
(c) Organisms which cause diseases
(d) All of these
Answer
Answer: (d) All of these
Question 17.
The full form of WWP is
(a) World Wide Transport Programme
(b) Waste Water Treatment Plant
(c) World Worker Talent Programme
(d) None of these
Answer
Answer: (b) Waste Water Treatment Plant
Question 18.
Sewage is mainly a
(a) liquid waste
(b) solid waste
(c) gaseous waste
(d) Mixture of solid and gas
Answer
Answer: (a) liquid waste
Question 19.
Which of the following is not a water-borne disease?
(a) Cholera
(b) Tuberculosis
(c) Typhoid
(d) Dysentery
Answer
Answer: (b) Tuberculosis
Question 20.
Which of the following is the characteristic quality of wastewater?
(a) Dirty look
(b) Foul smell
(c) Bad taste
(d) All the above
Answer
Answer: (d) All the above
Question 21.
Which of the following is a part of inorganic impurities of the sewage?
(a) Excreta
(b) Garbage
(c) Phosphate
(d) Vegetable waste
Answer
Answer: (c) Phosphate
Question 22.
Which of the following is the step of wastewater treatment?
(a) Chlorination
(b) Aeration
(c) Filtration
(d) All of the above
Answer
Answer: (d) All of the above
Question 23.
The aerobic bacteria can be grown in clarified water by
(a) filtration
(b) sewage
(c) aeration
(d) sedimentation
Answer
Answer: (c) aeration
Question 24.
Chlorine is used in municipal water treatment plant to
(a) change the taste of water
(b) prevent evaporation
(c) kill the harmful microorganisms
(d) prevent sedimentation
Answer
Answer: (c) kill the harmful microorganisms
Question 25.
Which of the following is not an inorganic impurity present in sewage?
(a) Nitrate
(b) Phosphorus
(c) Urea
(d) Metal salt
Answer
Answer: (c) Urea
Fill in the Blanks
Question 1.
Wastewater should be cleaned up by removing ……………..
Answer
Answer: pollutants
Question 2.
Some factors responsible for the increasing scarcity of freshwater are ……………..
Answer
Answer: population growth; pollution; mismanagement
Question 3.
The General Assembly of the …………….. proclaimed the period 2005-2015 as the International Decade for action on ‘Water for Life’.
Answer
Answer: United Nation
Question 4.
Sewage is a …………….. waste.
Answer
Answer: liquid
Question 5.
Sewage contains some organic impurities like oil, …………….. , …………….. and ……………..
Answer
Answer: urea; human faeces; animal waste
Question 6.
Air is pumped into the clarified water to help …………….. bacteria to grow.
Answer
Answer: aerobic
Question 7.
The full form of WWTP is ……………..
Answer
Answer: wastewater treatment plant
Question 8.
Sewage causes …………….. and …………….. pollution.
Answer
Answer: water, soil
Question 9.
Activated sludge mainly contains water and ……………..
Answer
Answer: microbes
Question 10.
Dried sludge is used as ……………..
Answer
Answer: manures
Question 11.
Water is the basic constituent of all ………………….
Answer
Answer: living beings
Question 12.
Sewage is a liquid waste which causes …………………. and …………………. pollution.
Answer
Answer: water, soil
Question 13.
Untreated human excreta is a …………………. hazard.
Answer
Answer: health
Question 14.
During the aeration of clarified water, …………………. bacteria can be grown.
Answer
Answer: aerobic
Question 15.
Cleaning of water is a process of removing ………………….
Answer
Answer: pollutants
Question 16.
Wastewater released by household is called ………………….
Answer
Answer: sewage
Question 17.
Vermi-composting toilets use …………………. to treat human waste.
Answer
Answer: earthworms
True or False
Question 1.
Wastewater is suitable for drinking purpose.
Answer
Answer: False
Question 2.
Wastewater can be revised.
Answer
Answer: True
Question 3.
Clean water is available for every person.
Answer
Answer: False
Question 4.
Pollution is one of the factors of the increasing scarcity of freshwater.
Answer
Answer: True
Question 5.
World Water Day is celebrated on 22 March every year.
Answer
Answer: True
Question 6.
Cleaning of water is also known as sewage treatment.
Answer
Answer: True
Question 7.
Sewage is wastewater.
Answer
Answer: True
Question 8.
The water that washes off the road and rooftop is fit for drinking.
Answer
Answer: False
Question 9.
Sewage contains many harmful substances which are known as sewerage.
Answer
Answer: False
Question 10.
From wastewater, skimmer remove the floating particles like oil and grease.
Answer
Answer: True
Question 11.
Where underground sewerage systems and refuse disposal systems are not available, the high cost on-site sanitation system can be adopted.
Answer
Answer: False
Question 12.
The activated sludge is about 94% water.
Answer
Answer: False
Question 13.
Dried sludge is used as manure.
Answer
Answer: True
Question 14.
After cleaning the sewage, it is directly used by humans.
Answer
Answer: False
Question 15.
Nutrient-rich sewage water supports the growth of algae.
Answer
Answer: True
Question 16.
Clean water is a basic need of human beings.
Answer
Answer: True
Question 17.
Used water is clean water.
Answer
Answer: False
Question 18.
Treatment plants reduce pollutants in wastewater to a level where nature can take care of it.
Answer
Answer: True
Question 19.
Open drain system is a breeding place for flies, mosquitoes and organisms which cause diseases.
Answer
Answer: True
Question 20.
People should defecate in the open.
Answer
Answer: False
Question 21.
Biogas is released by anaerobic bacterial.
Answer
Answer: True
Question 22.
Sanitation is not important for a community.
Answer
Answer: False
Match the following
| Column I | Column II |
| 1. Organic impurities | (a) Sewage treatment |
| 2. WWTP | (b) Required oxygen |
| 3. Inorganic impurities | (c) Removal of large objects |
| 4. Aerobic bacteria | (d) Decomposes sludge |
| 5. Vermi-processing toilet | (e) Nitrates, phosphates |
| 6. Bar screens | (f) Disinfect water |
| 7. Chlorine and ozone | (g) Herbicides and pesticides |
| 8. Anaerobic bacteria | (h) Earthworms |
| 9. Last stage of WWTP | (i) Chemical treatment |
| 10. First stage of WWTP | (j) Physical treatment |
Answer
Answer:
| Column I | Column II |
| 1. Organic impurities | (g) Herbicides and pesticides |
| 2. WWTP | (a) Sewage treatment |
| 3. Inorganic impurities | (e) Nitrates, phosphates |
| 4. Aerobic bacteria | (b) Required oxygen |
| 5. Vermi-processing toilet | (h) Earthworms |
| 6. Bar screens | (c) Removal of large objects |
| 7. Chlorine and ozone | (f) Disinfect water |
| 8. Anaerobic bacteria | (d) Decomposes sludge |
| 9. Last stage of WWTP | (i) Chemical treatment |
| 10. First stage of WWTP | (j) Physical treatment |
| Column A | Column B |
| 1. Bacteria | (a) Pesticides and herbicides |
| 2. Inorganic impurities | (b) Transport system that carries sewage |
| 3. Sewerage | (c) Cholera and typhoid |
| 4. Earthworm | (d) Nitrates and phosphates |
| 5. Organic impurities | (e) Used in verminprocessing toilets |
Answer
Answer:
| Column A | Column B |
| 1. Bacteria | (c) Cholera and typhoid |
| 2. Inorganic impurities | (d) Nitrates and phosphates |
| 3. Sewerage | (b) Transport system that carries sewage |
| 4. Earthworm | (e) Used in verminprocessing toilets |
| 5. Organic impurities | (a) Pesticides and herbicides |
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