{"id":12914,"date":"2022-05-22T19:30:11","date_gmt":"2022-05-22T14:00:11","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=12914"},"modified":"2022-05-13T11:54:36","modified_gmt":"2022-05-13T06:24:36","slug":"mcq-questions-for-class-7-science-chapter-18","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/mcq-questions-for-class-7-science-chapter-18\/","title":{"rendered":"MCQ Questions for Class 7 Science Chapter 18 Wastewater Story"},"content":{"rendered":"

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<\/a> 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.<\/p>\n

Wastewater Story Class 7 MCQs Questions with Answers<\/h2>\n

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.<\/p>\n

Question 1.
\nUntreated human excreta is a:
\n(a) waste water
\n(b) health hazard
\n(c) manure
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) health hazard
\nUntreated human excreta is a health-hazard.<\/p>\n<\/details>\n

\n

Question 2.
\nWhich process removes the solids like foeces and other substances from the waste water:
\n(a) chlorination
\n(b) decomposition
\n(c) evaporation
\n(d) sand and grit removal<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) sand and grit removal
\nSand and grit removal removes the solids from the waste water.<\/p>\n<\/details>\n

\n

Question 3.
\nExcreta from the toilet seats flow through covered drains into a chemicals:
\n(a) chemicals
\n(b) biogas plant
\n(c) vermi-processing toilets
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) biogas plant
\nExcreta from the toilet seats flow through covered drains into biogas plant.<\/p>\n<\/details>\n

\n

Question 4.
\nThe biogas product is used as a source of:
\n(a) rains
\n(b) oils
\n(c) energy
\n(d) all of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) energy
\nThe biogas product is used as a source of energy.<\/p>\n<\/details>\n

\n

Question 5.
\nWhat decomposes the sludge:
\n(a) aerobic bacteria
\n(b) anaerobic bacteria
\n(c) both (a) and (b)
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) anaerobic bacteria
\nAn aerobic bacteria decomposes the sludge.<\/p>\n<\/details>\n

\n

Question 6.
\nWhat helps to clean the clarified water:
\n(a) aerobic bacteria
\n(b) anaerobic bacteria
\n(c) both (a) and (b)
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) aerobic bacteria
\nAerobic bacteria clean the clarified water.<\/p>\n<\/details>\n

\n

Question 7.
\nThe instrument used to remove float-able solids from the waste water is:
\n(a) anemometer
\n(b) thermometer
\n(c) skimmer
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) skimmer
\nSkimmer remove the floatable solids from the waste water.<\/p>\n<\/details>\n

\n

Question 8.
\nBy which we can prevent drains at our houses from getting choked:
\n(a) cooking oil and fats should not be thrown down the drain
\n(b) used tea leaves thrown down the drain
\n(c) motor oil thrown down the drain
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) cooking oil and fats should not be thrown down the drain
\nCooking oil and fats should not be thrown down the drain.<\/p>\n<\/details>\n

\n

Question 9.
\nDifferent sources of waste water are:
\n(a) agricultural activities
\n(b) household activities
\n(c) industrial activities
\n(d) all of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) all of these
\nAll of these activities are the sources of waste water.<\/p>\n<\/details>\n

\n

Question 10.
\nWe use water at home to wash clothes and utensils, bathe and flush toilets, it becomes dirty water is called:
\n(a) drainage
\n(b) sewage
\n(c) wastewater
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) wastewater
\nDirty water called the waste water.<\/p>\n<\/details>\n

\n

Question 11.
\nWhich of these disease is not caused by improper disposal of sewage:
\n(a) cholera
\n(b) heart attack
\n(c) jaundice
\n(d) typhoid<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) heart attack
\nHeart attack is not caused by improper disposal of sewage.<\/p>\n<\/details>\n

\n

Question 12.
\nWhich of these statements are correct about Ozone:
\n(a) it is essential for breathing of living organism
\n(b) it is used to disinfect water
\n(c) it absorbs ultra voilet rays
\n(d) its proportion in air is about 3%<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) it is used to disinfect water & (c) it absorbs ultra voilet rays
\nOzone is used to disinfect water and absorb ultra violet rays.<\/p>\n<\/details>\n

\n

Question 13.
\nThe hyproducts of waste water treatment are:
\n(a) sludge
\n(b) biogas
\n(c) both (a) and (b)
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) both (a) and (b)
\nThe byproducts of waste water treatment are sludge and biogas.<\/p>\n<\/details>\n

\n

Question 14.
\nSewage is a:
\n(a) liquid waste
\n(b) solid waste
\n(c) gaseous waste
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) liquid waste
\nSewage is a bquid waste.<\/p>\n<\/details>\n

\n

Question 15.
\nFollowing process is not a part of waste water treament:
\n(a) chlorination
\n(b) decomposition
\n(c) evaporation
\n(d) grit and sand removal<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) evaporation
\nEvaporation is not a part of waste water treament.<\/p>\n<\/details>\n

\n

Question 16.
\nThis disease is not caused by polluted water:
\n(a) cholera
\n(b) typhoid
\n(c) haemorage
\n(d) hepatitis<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) haemorage
\nHaemorage is not caused by polluted water.<\/p>\n<\/details>\n

\n

Question 17.
\nTo improve sanitation following new technique is being used:
\n(a) onsite sewage disposal
\n(b) vermi processing toilets
\n(c) sewer system
\n(d) both (a) and (c)<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) onsite sewage disposal
\nTo improve sanitation obsite sewage disposal is being used<\/p>\n<\/details>\n

\n

Question 18.
\nThis is not the cause of water pollution:
\n(a) floods
\n(b) rains
\n(c) open defection
\n(d) chemicals<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) rains
\nRains is not the cause of water pollution<\/p>\n<\/details>\n

\n

Question 19.
\nFollowing should not be disposed off in the drains:
\n(a) tissue papers
\n(b) wastewater
\n(c) oils and fats
\n(d) excreta<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) oils and fats
\nOil and fats should not be disposed off in the drains.<\/p>\n<\/details>\n

\n

Question 20.
\nThe suspended impurities in sewage are called:
\n(a) contaminants
\n(b) sedimentation
\n(c) both (a) and (b)
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) contaminants
\nThe suspended impurities of sewage are contaminants.<\/p>\n<\/details>\n

\n

Question 21.
\nFull form of WWTP is:
\n(a) white water treatment plant
\n(b) waste water treatment plant
\n(c) both (a) and (b)
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) waste water treatment plant
\nWaste water treatment plant is the full form of WWTP.<\/p>\n<\/details>\n

\n

Question 22.
\nThe network of big and small pipes carrying waste water are called:
\n(a) sludge
\n(b) sullage waste
\n(c) sewers
\n(d) all of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) sewers
\nSewers are the network of big and small pipes for waste water.<\/p>\n<\/details>\n

\n

Question 23.
\nDried sludge is used as:
\n(a) sludge
\n(b) sewers
\n(c) waste water treatment plant
\n(d) manure<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) manure
\nDried sludge is used as manure.<\/p>\n<\/details>\n

\n

Question 24.
\nDrains get blocked by:
\n(a) chemicals
\n(b) kitchen waste
\n(c) both (a) and (b)
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) both (a) and (b)
\nDrains get blocked by both (a) and (b) chemicals and kitchen waste.<\/p>\n<\/details>\n

\n

Question 25.
\nThe water is taken to grit and sand removal tank where impurities are removed by:
\n(a) contaminants
\n(b) sedimentation
\n(c) both (a) and (b)
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) sedimentation
\nImpurities are removed by sedimentation.<\/p>\n<\/details>\n

\n

Question 26.
\nSludge is collected solid waste from the waste water during the treatment in:
\n(a) health hazard
\n(b) white water treatment plant
\n(c) waste water treatment plant
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) waste water treatment plant
\nSludge is collected solid waste during the waste water treatment plant.<\/p>\n<\/details>\n

\n

Question 27.
\nChlorine and ozone are used to:
\n(a) infect water
\n(b) disinfect water
\n(c) filtered
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) disinfect water
\nChlorine and Ozone are used to disinfect water.<\/p>\n<\/details>\n

\n

Match the column A with column B:<\/span><\/p>\n

Question 1.<\/p>\n\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Organic impurities<\/td>\n(i) human faeces, animal waste, oil etc<\/td>\n<\/tr>\n
(b) Inorganic impurities<\/td>\n(ii) such as which cause dysentery<\/td>\n<\/tr>\n
(c) Nutrients<\/td>\n(iii) nitrates, phosphates, metals<\/td>\n<\/tr>\n
(d) Bacteria<\/td>\n(iv) phosphates, nitrogen<\/td>\n<\/tr>\n
(e) Other microbes<\/td>\n(v) such as which cause cholera and typhoid<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n\n\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Organic impurities<\/td>\n(i) human faeces, animal waste, oil etc<\/td>\n<\/tr>\n
(b) Inorganic impurities<\/td>\n(iii) nitrates, phosphates, metals<\/td>\n<\/tr>\n
(c) Nutrients<\/td>\n(iv) phosphates, nitrogen<\/td>\n<\/tr>\n
(d) Bacteria<\/td>\n(v) such as which cause cholera and typhoid<\/td>\n<\/tr>\n
(e) Other microbes<\/td>\n(ii) such as which cause dysentery<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

Fill in the blanks:<\/span><\/p>\n

Question 1.
\n……………….. bacteria decomposes the sludge.<\/p>\n

\nAnswer<\/span><\/summary>\n

anaerobic<\/p>\n<\/details>\n

\n

Question 2.
\nFloat-able solids are removed by ………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

skimmer<\/p>\n<\/details>\n

\n

Question 3.
\n……………….. can be improved by low cost onsite sewage disposal systems are used.<\/p>\n

\nAnswer<\/span><\/summary>\n

Composting pits<\/p>\n<\/details>\n

\n

Question 4.
\nSeptic tanks, ……………….. chemical toilets are the examples of onsite sewage disposal systems.<\/p>\n

\nAnswer<\/span><\/summary>\n

sanitation<\/p>\n<\/details>\n

\n

Question 5.
\nBar screens clear the waste water of all ……………….. impurities.<\/p>\n

\nAnswer<\/span><\/summary>\n

physical<\/p>\n<\/details>\n

\n

Question 6.
\nCleaning of water is a process of removing ………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

pollutants<\/p>\n<\/details>\n

\n

Question 7.
\nWaste water released by house is called ………………..<\/p>\n

\nAnswer<\/span><\/summary>\n

sewage<\/p>\n<\/details>\n

\n

Question 8.
\nDried ……………….. is used as manure.<\/p>\n

\nAnswer<\/span><\/summary>\n

sludge<\/p>\n<\/details>\n

\n

State the following statements are True or False:<\/span><\/p>\n

Question 1.
\nSewage is a solid waste.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 2.
\nDecomposition is not a part of waste water treatment.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 3.
\nZone proportion in air is about 3%.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 4.
\nUntreated human excreta is a health-hazard.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

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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 …<\/p>\n

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