Sewage is mainly a

1

(a)

liquid waste

(b)

solid waste

(c)

gaseous waste

(d)

mixture of solid and gas

Which of the following is/are products of wastewater treatment?

1

(a)

Biogas

(b)

Sludge

(c)

Both biogas and sludge

(d)

Aerator

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

1

(a)

sewers

(b)

sewerage

(c)

transport system

(d)

treatment plant

One of the following type of trees are said to help in purifying wastewater quite rapidly when planted all along the sewage ponds. These are

1

(a)

Eucalyptus trees

(b)

Ficus trees

(c)

neem trees

(d)

peepal trees

Which one of the following is a quality of wastewater?

1

(a)

Fowl smell

(b)

Bad taste

(c)

Dirty look

(d)

All of these

Wastewater is treated in ______________ treatment plant.

1

(a)

waste

Stagnant water blocked in drains is good breeding place for _______________

1

(a)

insect vectors

All portable toilets are ________________ toilets.

1

(a)

chemical

The full form of WWTP is _______________

1

(a)

wastewater treatment plant

Bacteria play important _______________ in sewage treatment.

1

(a)

role

Poor sanitation and contaminated drinking water is the cause of a large number of diseases.

1

(a) False

(b) True

Wastewater is transparent, colourless, odourless.

1

(a) True

(b) False

Tuberculosis is a water-borne disease.

1

(a) True

(b) False

Aerobic bacteria produces biogas sludge in the digester tank.

1

(a) True

(b) False

Urea is an inorganic impurity present in sewage.

1

(a) True

(b) False

The Eucalyptus trees are planted along sewage ponds. Give reason.

2

(a)

Mention the use of dried sludge.

2

(a)

Give some examples of onsite sewage disposal systems.

2

(a)

Protozoa is causative organism of which waterborne disease?

2

(a)

In the chemical process of water treatment water is treated with some chemicals. Describe chlorination in light of it.

2

(a)

Untreated human excreta is a health hazard. Explain.

3

(a)

A man travelling in a train threw an empty packet of food on the platform. Do you think this is a proper waste disposal method? Elaborate.

3

(a)

With reference to the treatment of polluted water at home by aeration, filtration, chlorination processes answer the following questions.
What is removed by the sand filter?

3

(a)

With reference to the treatment of polluted water at home by aeration, filtration, chlorination processes answer the following questions.
Do chlorine have an odour?

3

(a)

Observe the given figure and answer the following: State the functions of each part of the figure?

3

(a)

There are many alternative sewage disposal systems which have been developed as per needs of the community, persons, occasions, etc. Few situations/specifications of the sewage need are given below. Write the name of sewage which can be used in the following conditions.
(a) A toilet which can provide high quality manure.
(b) The toilet which is used in aeroplane during flight.
(c) A toilet which can be used in some out door gathering.
(d) A toilet used in limited water supply.
(e) A toilet which contaminates water of hand pump installed nearby.

5

(a)

Think and suggest some ways to minimise waste and pollutants at their source, taking your home as an example.

5

(a)