ANSWERS for Science Quiz Based on NCERT(WASTE WATER)


1: The light materials which float during waste water treatment is
A.sludge
B.scum
C.sewerage
D.biogas

1.b


2: Which of the following is produced during waste water treatment?
A.sludge
B.biogas
C.both biogas and sludge
D.none of these

2.c

3: Contaminated water disease is
A.gastroenteritis
B.malaria
C.flu
D.none of these

3.a

4: Which of the following is a part of waste water treatment plant?
A.clarifier
B.aeration tank
C.vertical bars
D.all of these

4.d

5: Which of the following is a FALSE statement?
A.Solid wastes such as tea leaves and soft toys should be thrown in dustbin.
B.Chemicals like paints and medicines should not be thrown in sink.
C.Cooking oil should be thrown down in the wash basin.
D.Polythene bags should not be thrown in the drains.

5.c

6: Activate sludge is about ______ water.
A.10%
B.25%
C.79%
D.97%

6.d

7: Which of the following trees should be grown nearby sewage ponds?
A.Eucalyptus trees
B.Ashoka trees
C.Mango trees
D.Banana trees

7.a

8: Which of the following is an example of low cost onsite sewage disposal system?
A.septic tanks
B.chemical toilets
C.composting pits
D.all of these

8.d

9: Sewage is a _______ waste which causes which causes water and soil pollution.
A.solid
B.liquid
C.gaseous
D.all of these

9.b

10: Which microbe is used to decompose sludge into bio gas?
A.aerobic bacteria
B.anaerobic bacteria
C.algae
D.fungi

10.b

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