Here we are providing Class 7 Science Objective Chapter – 18 Wastewater Story because its very important for Class 7 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 7 Science Objective Chapter – 18 Wastewater Story is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 7 Science Objective Chapter – 18 Wastewater Story 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 7 Science ObjectiveChapter – 18 Wastewater Story
1.Untreated human excreta is a:
( A ) waste water
( B ) health hazard
( C ) manure
( D ) none of these
Ans – ( B )
2.Which one of the following is a quality of wastewater?
( A ) Foul smell
( B ) Bad taste
( C ) Dirty look
( D ) All of these
Ans – ( D )
3.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
Ans – ( D )
4.Period 2005-2015 is being celebrated as the international decade for action on
( A ) water for life
( B ) education for all
( C ) global war
( D ) terrorism
Ans – ( A )
5.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
Ans – ( B )
6.In sewerage manholes are located at every
( A ) 20-25 m
( B ) 50-60 m
( C ) 90-100 m
( D ) 100-110 m
Ans – ( B )
7.The biogas product is used as a source of:
( A ) rains
( B ) oils
( C ) energy
( D ) all of these
Ans – ( C )
8.What decomposes the sludge:
( A ) aerobic bacteria
( B ) anaerobic bacteria
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( B )
9.Which one of the following is a step in wastewater treatment?
( A ) Aeration
( B ) Filtration
( C ) Chlorination
( D ) All of these
Ans – ( D )
10.What helps to clean the clarified water:
( A ) aerobic bacteria
( B ) anaerobic bacteria
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( A )
11.Which one of the following is used in vermi-processing toilet?
( A ) Earthworm
( B ) Cockroach
( C ) Both of these
( D ) None of these
Ans – ( A )
12.The instrument used to remove float-able solids from the waste water is:
( A ) anemometer
( B ) thermometer
( C ) skimmer
( D ) none of these
Ans – ( C )
13.Sewage is mainly a
( A ) liquid waste
( B ) Solid waste
( C ) gaseous waste
( D ) Mixture of solid and gas
Ans – ( A )
14.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
Ans – ( A )
15.Which of the following is/are products of wastewater treatment?
( A ) Biogas
( B ) Sludge
( C ) Both Biogas and sludge
( D ) Aerator
Ans – ( C )
16.Different sources of waste water are:
( A ) agricultural activities
( B ) household activities
( C ) industrial activities
( D ) all of these
Ans – ( D )
17.Which of the following is/are products of wastewater treatment?
( A ) Biogas
( B ) Sludge
( C ) Both Biogas and sludge
( D ) Aerator
Ans – ( D )
18.Which of the following is/are products of wastewater treatment?
( A ) Biogas
( B ) Sludge
( C ) Both Biogas and sludge
( D ) Aerator
Ans – ( C )
19.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
Ans – ( C )
20.Which of the following is not a source of waste water?
( A ) Sewers
( B ) Homes
( C ) Industries
( D ) Hospitals
Ans – ( A )
21.Which of the following is not a source of waste water?
( A ) Sewers
( B ) Homes
( C ) Industries
( D ) Hospitals
Ans – ( A )
22.Which of these disease is not caused by improper disposal of sewage:
( A ) cholera
( B ) heart attack
( C ) jaundice
( D ) typhoid
Ans – ( B )
23.Water that is not fit for use is called
( A ) clean water
( B ) wastewater
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( B )
24.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%
Ans – ( B )
25.Which of the following is not a source of wastewater?
( A ) Sewers
( B ) Homes
( C ) Industries
( D ) Hospitals
Ans – ( A )
26.The hyproducts of waste water treatment are:
( A ) sludge
( B ) biogas
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( C )
27.The period of International Decade for action on ‘Water for Life’ is
( A ) 2000-2010
( B ) 2005-2015
( C ) 2010-2020
( D ) 2003-2013
Ans – ( B )
28.Sewage is a:
( A ) liquid waste
( B ) solid waste
( C ) gaseous waste
( D ) none of these
Ans – ( A )
29.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
Ans – ( A )
30.Following process is not a part of waste water treament:
( A ) chlorination
( B ) decomposition
( C ) evaporation
( D ) grit and sand removal
Ans – ( C )
31.Which of the following is a part of inorganic impurities of the sewage?
( A ) Pesticides
( B ) Urea
( C ) Phosphates
( D ) Vegetable waste
Ans – ( C )
32.This disease is not caused by polluted water:
( A ) cholera
( B ) typhoid
( C ) haemorage
( D ) hepatitis
Ans – ( C )
33.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
Ans – ( B )
34.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)
Ans – ( A )
35.Suspended impurities contained by sewage are called
( A ) contaminants
( B ) sludge
( C ) grey water
( D ) none of these
Ans – ( A )
36.This is not the cause of water pollution:
( A ) floods
( B ) rains
( C ) open defection
( D ) chemicals
Ans – ( B )
37.A network of big and small pipes under the ground for wastewater management is known as
( A ) sewage
( B ) sewerage
( C ) manhole
( D ) channel
Ans – ( B )
38.Following should not be disposed off in the drains:
( A ) tissue papers
( B ) wastewater
( C ) oils and fats
( D ) excreta
Ans – ( C )
39.Solid waste extracted during sewage treatment is known as
( A ) sewage
( B ) sludge
( C ) biogas
( D ) contaminants
Ans – ( B )
40.The suspended impurities in sewage are called:
( A ) contaminants
( B ) sedimentation
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( A )
41.Sludge in separate tanks is decomposed to get biogas by
( A ) yeasts
( B ) aerobic bacteria
( C ) anaerobic bacteria
( D ) none of these
Ans – ( C )
42.Full form of WWTP is:
( A ) white water treatment plant
( B ) waste water treatment plant
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( B )
43.Sewage is mainly a
( A ) liquid waste
( B ) Solid waste
( C ) gaseous waste
( D ) Mixture of solid and gas
Ans – ( A )
44.The network of big and small pipes carrying waste water are called:
( A ) sludge
( B ) sullage waste
( C ) sewers
( D ) all of these
Ans – ( C )
45. 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
Ans – ( D )
46.Dried sludge is used as:
( A ) sludge
( B ) sewers
( C ) waste water treatment plant
( D ) manure
Ans – ( D )
47. Water that is not fit for use is called
( A ) clean water
( B ) wastewater
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( B )
48.Drains get blocked by:
( A ) chemicals
( B ) kitchen waste
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( C )
49.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
Ans – ( B )
50. Which one of the following is a quality of wastewater?
( A ) Foul smell
( B ) Bad taste
( C ) Dirty look
( D ) All of these
Ans – ( D )
51.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
Ans – ( C )
52. Which one is not a of household garbage
( A ) Vegetable peels
( B ) Dal packets
( C ) Crockery pieces
( D ) Cow dung
Ans – ( D )
53.Chlorine and ozone are used to:
( A ) infect water
( B ) disinfect water
( C ) filtered
( D ) none of these
Ans – ( B )
