Pick from the following one chemical used to disinfect water.
(a) Chlorine
(b) Washing soda
(c) Silica
(d) Coal
Water polluted by various human activities causes a number
of water borne diseases. Which of the following is not a water
borne disease?
(a) Cholera
(b) Typhoid
(c) Asthma
(d) Dysentry
Open drain system is a breeding place for which of the
following.
(a) Flies
(b) Mosquitoes
(c) Organisms which cause diseases
(d) All of these
Which of the following is/are products of wastewater
treatment?
(a) Biogas
(b) Sludge
(c) Both biogas and sludge
(d) Aerator
Sewage is mainly a
(a) liquid waste.
(b) solid waste.
(c) gaseous waste.
(d) mixture of solid and gas.
Which of the following is waste water?
(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
“A bunch of seedlings were seen sprouting on a heap of animal
dropping in a forest.” How do you think is the seedling benefited
from the animal dung?
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