Question

Q.1.Fill in the blanks a- Sea water is unfit for _______ purpose.

b- Discharge of waste water from industries is called__________.

c- Disinfection is the _________stage of water treatment.

d- Secondary treatment is also known as___________treatment.

e- Waste water discharged from our homes is called__________.

f- ____________is a non biodegradable waste.

Q.2.Write true or false for the following statementsa-Domestic sewage is free from microorganisms. ( )

b-Chlorination kills harmful bacteria in water. ( )

c-The solubility of gases increases with falling temperature. ( )

d-Sewage water should flow in closed drains.( )

e-Sewage water contains solid as well as biological waste.( )

f-Waste is an important environmental and public health issue of global concern.( )

g-Diarrhoea is a disease caused by polluted air.( )

h-Industrial waste contaminate the water.( )

Q.3.Choose the correct answer:

a- Sewage pollutes

i- soil ii-air iii-sea iv-water

b- Improper sewage disposal does not cause

i-Cholera ii-Jaundice iii-Heart Attack iv-Typhoid

c- The solid waste separated from domestic sewage is called

i-Slurry ii-Humus iii-Sludge iv-Manure

d- Biodegradable wastes

i-accumulate in nature ii-enter in food chain

iii-are dangerous iv-decompose in nature

e- Disinfection of water is done by

i-Chlorine ii-Ozone iii-UV radiation iv-All of these

Q.4.Match the following:

i-Malaria a-Non-biodegradable waste

ii-Potable water b-Excessive algae growth

iii-Incineration c-Biodegradable waste

iv-Secondary treatment d-Landfill

v-Plastic e-Open drains

vi-Vegetable matter f-Bio-accumulation

vii-Eutrophication g-Water suitable for drinking

viii-Automobiles h-Burning at high temperature

ix-Modes of waste disposal i-Gaseous waste

x-DDT accumulated in food chain j-Biological treatment

Q.5.Answer the following questions:

a-What happens when there is leakage in sewer pipes?

b-Mention some of the most common water born diseases?

c-What are the different ways of solid waste disposal?

d-Distinguish between Biodegradable and Non-biodegradable wastes?

e-What problem can arise due to improper drainage?

f-Define: i-sewage ii-Landfill iii-Leaching

g-What is sludge? How is it obtained? How can it be used?

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Answer 1

Answer:

A] Drinking

B]Sewage/drainage

F]Plastic

Explanation:

Answer 2

Explanation:

क्लीन द ब्लैंक वन नंबर वन