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Water Purification
Test Description: What and how is water purified by nature and by man
Instructions: Answer all questions to get your test result.
1) What is the dropping of particles from water due to slowing of water movement?
A
filtering
B
evaporation
C
sedimentation
D
bacterial and plant action
2) What naturally removes most of the smaller particles from water?
A
sedimentation
B
infiltration
C
bacterial and plant action
D
evaporation
3) What breaks down organic matter into carbon dioxide and water
A
infiltration
B
evaporation
C
bacterial and plant action
D
sedimentation
4) What is the removal of particles by passing water through materials with smaller and smaller holes?
A
bacterial and plant action
B
sedimentation
C
evaporation
D
filtering
5) What process removes virtually all dissolved materials from water?
A
infiltration
B
sedimentation
C
evaporation
D
bacterial and plant action
6) What process easily removes large particles from water as the movement of water slows?
A
evaporation
B
bacterial and plant action
C
infiltration
D
sedimentation
7) What is the first step in cleaning wastewater?
A
bar screens
B
grit tank
C
digesters
D
clarifier tanks
8) What step in the treatment of wastewater produces methane gas that can be used for electricity and heat?
A
settling tanks
B
bar screens
C
clarifier tanks
D
digesters
9) What can be used to kill disease-causing bacteria in treated wastewater?
A
UV radiation
B
ozone
C
chlorine
D
all of these
10) Which agent for purifying water, does not kill bacteria but makes them unable to reproduce?
A
chlorine
B
all of these
C
ozone
D
UV radiation
11) What happens in the clarifier tanks?
A
organic matter settles to the bottom and is removed
B
bacteria using oxygen break organic matter into carbon dioxide and water
C
organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
D
bacteria, without oxygen, break down organic matter releasing methane
12) What happens in the digester tanks?
A
organic matter settles to the bottom and is removed
B
organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
C
bacteria using oxygen break organic matter into carbon dioxide and water
D
bacteria, without oxygen, break down organic matter releasing methane
13) What happens in settling tanks?
A
organic matter settles to the bottom and is removed
B
bacteria using oxygen break organic matter into carbon dioxide and water
C
bacteria, without oxygen, break down organic matter releasing methane
D
organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
14) What happens to the waste after the digester?
A
organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
B
bacteria using oxygen break organic matter into carbon dioxide and water
C
organic matter settles to the bottom and is removed
D
bacteria, without oxygen, break down organic matter releasing methane
15) How do plants help clean water?
A
they perform transpiration that releases clean water vapor
B
all of the above
C
they help the water to slow and allow for sedimentation
D
they remove contaminants from the water
*select an answer for all questions
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