Class 7 Science Chapter 18 MCQs Questions With Answers NCERT
Students are advised to practice the NCERT MCQ Questions for Class 7 Science Chapter 18 Wastewater Story with Answers Pdf free download is available here. MCQ Questions for Class 7 Science with Answers are prepared as per the Latest Exam Pattern. Students can solve these Wastewater Story Class 7 MCQs Questions with Answers and assess their preparation level.
Wastewater Story Class 7 MCQ
Solving the Wastewater Story Multiple Choice Questions of Class 7 Science Chapter 18 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Wastewater Story Class 7 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 18 Science Class 7 and cross-check your answers during preparation.
Question 1.
Untreated human excreta is a:
(a) waste water
(b) health hazard
(c) manure
(d) none of these
Answer
(b) health hazard
Untreated human excreta is a health-hazard.
Question 2.
Which process removes the solids like foeces and other substances from the waste water:
(a) chlorination
(b) decomposition
(c) evaporation
(d) sand and grit removal
Answer
(d) sand and grit removal
Sand and grit removal removes the solids from the waste water.
Question 3.
Excreta from the toilet seats flow through covered drains into a chemicals:
(a) chemicals
(b) biogas plant
(c) vermi-processing toilets
(d) none of these
Answer
(b) biogas plant
Excreta from the toilet seats flow through covered drains into biogas plant.
Question 4.
The biogas product is used as a source of:
(a) rains
(b) oils
(c) energy
(d) all of these
Answer
(c) energy
The biogas product is used as a source of energy.
Question 5.
What decomposes the sludge:
(a) aerobic bacteria
(b) anaerobic bacteria
(c) both (a) and (b)
(d) none of these
Answer
(b) anaerobic bacteria
An aerobic bacteria decomposes the sludge.
Question 6.
What helps to clean the clarified water:
(a) aerobic bacteria
(b) anaerobic bacteria
(c) both (a) and (b)
(d) none of these
Answer
(a) aerobic bacteria
Aerobic bacteria clean the clarified water.
Question 7.
The instrument used to remove float-able solids from the waste water is:
(a) anemometer
(b) thermometer
(c) skimmer
(d) none of these
Answer
(c) skimmer
Skimmer remove the floatable solids from the waste water.
Question 8.
By which we can prevent drains at our houses from getting choked:
(a) cooking oil and fats should not be thrown down the drain
(b) used tea leaves thrown down the drain
(c) motor oil thrown down the drain
(d) none of these
Answer
(a) cooking oil and fats should not be thrown down the drain
Cooking oil and fats should not be thrown down the drain.
Question 9.
Different sources of waste water are:
(a) agricultural activities
(b) household activities
(c) industrial activities
(d) all of these
Answer
(d) all of these
All of these activities are the sources of waste water.
Question 10.
We use water at home to wash clothes and utensils, bathe and flush toilets, it becomes dirty water is called:
(a) drainage
(b) sewage
(c) wastewater
(d) none of these
Answer
(c) wastewater
Dirty water called the waste water.
Question 11.
Which of these disease is not caused by improper disposal of sewage:
(a) cholera
(b) heart attack
(c) jaundice
(d) typhoid
Answer
(b) heart attack
Heart attack is not caused by improper disposal of sewage.
Question 12.
Which of these statements are correct about Ozone:
(a) it is essential for breathing of living organism
(b) it is used to disinfect water
(c) it absorbs ultra voilet rays
(d) its proportion in air is about 3%
Answer
(b) it is used to disinfect water & (c) it absorbs ultra voilet rays
Ozone is used to disinfect water and absorb ultra violet rays.
Question 13.
The hyproducts of waste water treatment are:
(a) sludge
(b) biogas
(c) both (a) and (b)
(d) none of these
Answer
(c) both (a) and (b)
The byproducts of waste water treatment are sludge and biogas.
Question 14.
Sewage is a:
(a) liquid waste
(b) solid waste
(c) gaseous waste
(d) none of these
Answer
(a) liquid waste
Sewage is a bquid waste.
Question 15.
Following process is not a part of waste water treament:
(a) chlorination
(b) decomposition
(c) evaporation
(d) grit and sand removal
Answer
(c) evaporation
Evaporation is not a part of waste water treament.
Question 16.
This disease is not caused by polluted water:
(a) cholera
(b) typhoid
(c) haemorage
(d) hepatitis
Answer
(c) haemorage
Haemorage is not caused by polluted water.
Question 17.
To improve sanitation following new technique is being used:
(a) onsite sewage disposal
(b) vermi processing toilets
(c) sewer system
(d) both (a) and (c)
Answer
(a) onsite sewage disposal
To improve sanitation obsite sewage disposal is being used
Question 18.
This is not the cause of water pollution:
(a) floods
(b) rains
(c) open defection
(d) chemicals
Answer
(b) rains
Rains is not the cause of water pollution
Question 19.
Following should not be disposed off in the drains:
(a) tissue papers
(b) wastewater
(c) oils and fats
(d) excreta
Answer
(c) oils and fats
Oil and fats should not be disposed off in the drains.
Question 20.
The suspended impurities in sewage are called:
(a) contaminants
(b) sedimentation
(c) both (a) and (b)
(d) none of these
Answer
(a) contaminants
The suspended impurities of sewage are contaminants.
Question 21.
Full form of WWTP is:
(a) white water treatment plant
(b) waste water treatment plant
(c) both (a) and (b)
(d) none of these
Answer
(b) waste water treatment plant
Waste water treatment plant is the full form of WWTP.
Question 22.
The network of big and small pipes carrying waste water are called:
(a) sludge
(b) sullage waste
(c) sewers
(d) all of these
Answer
(c) sewers
Sewers are the network of big and small pipes for waste water.
Question 23.
Dried sludge is used as:
(a) sludge
(b) sewers
(c) waste water treatment plant
(d) manure
Answer
(d) manure
Dried sludge is used as manure.
Question 24.
Drains get blocked by:
(a) chemicals
(b) kitchen waste
(c) both (a) and (b)
(d) none of these
Answer
(c) both (a) and (b)
Drains get blocked by both (a) and (b) chemicals and kitchen waste.
Question 25.
The water is taken to grit and sand removal tank where impurities are removed by:
(a) contaminants
(b) sedimentation
(c) both (a) and (b)
(d) none of these
Answer
(b) sedimentation
Impurities are removed by sedimentation.
Question 26.
Sludge is collected solid waste from the waste water during the treatment in:
(a) health hazard
(b) white water treatment plant
(c) waste water treatment plant
(d) none of these
Answer
(c) waste water treatment plant
Sludge is collected solid waste during the waste water treatment plant.
Question 27.
Chlorine and ozone are used to:
(a) infect water
(b) disinfect water
(c) filtered
(d) none of these
Answer
(b) disinfect water
Chlorine and Ozone are used to disinfect water.
Match the column A with column B:
Question 1.
| Column-A | Column-B |
| (a) Organic impurities | (i) human faeces, animal waste, oil etc |
| (b) Inorganic impurities | (ii) such as which cause dysentery |
| (c) Nutrients | (iii) nitrates, phosphates, metals |
| (d) Bacteria | (iv) phosphates, nitrogen |
| (e) Other microbes | (v) such as which cause cholera and typhoid |
Answer
| Column-A | Column-B |
| (a) Organic impurities | (i) human faeces, animal waste, oil etc |
| (b) Inorganic impurities | (iii) nitrates, phosphates, metals |
| (c) Nutrients | (iv) phosphates, nitrogen |
| (d) Bacteria | (v) such as which cause cholera and typhoid |
| (e) Other microbes | (ii) such as which cause dysentery |
Fill in the blanks:
Question 1.
……………….. bacteria decomposes the sludge.
Answer
anaerobic
Question 2.
Float-able solids are removed by ………………..
Answer
skimmer
Question 3.
……………….. can be improved by low cost onsite sewage disposal systems are used.
Answer
Composting pits
Question 4.
Septic tanks, ……………….. chemical toilets are the examples of onsite sewage disposal systems.
Answer
sanitation
Question 5.
Bar screens clear the waste water of all ……………….. impurities.
Answer
physical
Question 6.
Cleaning of water is a process of removing ………………..
Answer
pollutants
Question 7.
Waste water released by house is called ………………..
Answer
sewage
Question 8.
Dried ……………….. is used as manure.
Answer
sludge
State the following statements are True or False:
Question 1.
Sewage is a solid waste.
Answer
False
Question 2.
Decomposition is not a part of waste water treatment.
Answer
False
Question 3.
Zone proportion in air is about 3%.
Answer
False
Question 4.
Untreated human excreta is a health-hazard.
Answer
True
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