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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
sedimentation
B
filtering
C
bacterial and plant action
D
evaporation
2) What naturally removes most of the smaller particles from water?
A
sedimentation
B
bacterial and plant action
C
evaporation
D
infiltration
3) What breaks down organic matter into carbon dioxide and water
A
evaporation
B
sedimentation
C
infiltration
D
bacterial and plant action
4) What is the removal of particles by passing water through materials with smaller and smaller holes?
A
filtering
B
sedimentation
C
bacterial and plant action
D
evaporation
5) What process removes virtually all dissolved materials from water?
A
infiltration
B
evaporation
C
bacterial and plant action
D
sedimentation
6) What process easily removes large particles from water as the movement of water slows?
A
sedimentation
B
bacterial and plant action
C
evaporation
D
infiltration
7) What is the first step in cleaning wastewater?
A
clarifier tanks
B
digesters
C
grit tank
D
bar screens
8) What step in the treatment of wastewater produces methane gas that can be used for electricity and heat?
A
bar screens
B
digesters
C
settling tanks
D
clarifier tanks
9) What can be used to kill disease-causing bacteria in treated wastewater?
A
ozone
B
chlorine
C
all of these
D
UV radiation
10) Which agent for purifying water, does not kill bacteria but makes them unable to reproduce?
A
all of these
B
UV radiation
C
chlorine
D
ozone
11) What happens in the clarifier tanks?
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
bacteria, without oxygen, break down organic matter releasing methane
D
organic matter settles to the bottom and is removed
12) What happens in the digester tanks?
A
organic matter in the form of sludge cakes are taken to the landfill, burned or used as fertilizer
B
bacteria, without oxygen, break down organic matter releasing methane
C
bacteria using oxygen break organic matter into carbon dioxide and water
D
organic matter settles to the bottom and is removed
13) What happens in settling tanks?
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
bacteria, without oxygen, break down organic matter releasing methane
D
organic matter settles to the bottom and is removed
14) What happens to the waste after the digester?
A
bacteria, without oxygen, break down organic matter releasing methane
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
organic matter settles to the bottom and is removed
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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