Page 2 - H.A-2 (PRACTICE WORKSHEET)

5. The solid matter produced during sewage is R 1
a) Slurry
b) Sludge
c) Humus
d) Microbes
6. Bio gas is produced in the following process U 1

a) Digestion
b) Circulation
c) Excretion
d) Respiration

7. Which of the following is not a step involved in U 1
alternative method of sewage disposal?

a) Septic tank
b) Chemical treatment
c) Incineration
d) Landfill

8. Give reason for the following s. R 3
a) It is necessary to treat the sewage before
disposal to water bodies.
b) UV light is used in the wastewater treatment
method.
c) Oil or paint should not be thrown in water.

9. Define the following: - U 3
Landfill
Septic tank
Incineration

10 Give two examples of the following. U& 5
a) Organic impurities A
b) Inorganic impurities
c) Nutrients
d) Bacteria
e) Microbes

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