Wastewater Treatment Grade 1 Exam
Questions with Answers
Which of the following are the ideal indicator for pathogens? - ✔✔Coliform group bacteria
Acids, bases, and salts lacking carbon are - ✔✔inorganic compounds
The organisms used to indicate the likelihood that pathogenic bacteria may be present are -
✔✔coliform bacteria
A physical property, as opposed to a chemical property, important to water treatment is -
✔✔turbidity
Which of the following are the two principal chemicals that cause water hardness? -
✔✔Calcium and magnesium
Which of the following statements about viruses is not correct?
a. Viruses have no independent metabolism and depend on living cells for reproduction
b. Viruses range in diameter from 10 to 25 nanometers (nm), which is smaller that can be seen
with an optical microscope
c. Viruses cannot survive in the environment for any length of time outside of a human's or an
animal's body
d. Some types of viruses can cause acute epidemics of gastroenteritis - ✔✔c. Viruses cannot
survive in the environment for any length of time outside of a human's or and animal's body
Which of the following are commonly used as an indicator of drinking water quality?
a. Protozoan parasites
b. Coliform bacteria
,c. Cryptosporidium oocysts
d. Viruses - ✔✔b. Coliform bacteria
What is the term for the smallest particle that retains the characteristics of the element that it
helps form? - ✔✔Atom
What is a radical? - ✔✔A radical is a group of elements that bond together and act like single
atoms or ions in forming compounds
What measurements are used to express the weight of solute dissolved in a given volume of
solution? - ✔✔Milligrams per liter (mg/L) and grains per gallon (gpg)
Replacing the final digits of a number with zeros, thus expressing the number as tens,
hundreds, thousands, etc., is referred to as - ✔✔rounding
In solving for an unknown value, you must - ✔✔know all the values for all but one of the terms
of the equation to be used
What is the purpose of scientific notation? - ✔✔Scientific notation allows people to express any
number as a term multiplied by a power of 10
In performing treatment plant operations, what can you expect to happen if one of the
operating conditions changes? - ✔✔A proportionate change will occur in some other condition
What is linear measurement? - ✔✔Linear measurement defines the distance along a line; it is
the measurement between two points
Provisions of which regulation are intended to protect drinking water consumers against the
unintended public health consequences associated with consumption of treated drinking water
, containing residual disinfectants and disinfection by-products? - ✔✔Disinfectants and
Disinfection By-products Rule
Under the Stage 1 DBPR, the compliance value for TTHM and HAA5 is determined by calculating
a _____ during the previous 12 months for each DBP for all monitoring locations at each plant. -
✔✔running annual average
Which of the following is not typically a section covered in a sanitary survey? - ✔✔Fire
department hydrants
The maximum contaminant level for arsenic - ✔✔is higher than technically feasible
MCL for Nitrate and Nitrite - ✔✔10 mg/L and 1 mg/L
MCL for Fluoride - ✔✔4.0 mg/L
MCL for TTHM and HAA5 - ✔✔0.080 mg/L and 0.060 mg/L
MCL for Arsenic - ✔✔0.010 mg/L
List and explain the treatment technic requirements for the following: Copper, Lead - ✔✔Action
levels of 1.3 mg/L and 0.015 mg/L
Explain the regulations for microbiological contaminates included in the total coliform rule and
its revisions. - ✔✔MCL goal is zero for E. coli. Total coliform positive samples require three
repeat samples tested for E. coli, A positive E. coli repeat sample triggers a violation notice and
further actions to eliminate the contamination
Questions with Answers
Which of the following are the ideal indicator for pathogens? - ✔✔Coliform group bacteria
Acids, bases, and salts lacking carbon are - ✔✔inorganic compounds
The organisms used to indicate the likelihood that pathogenic bacteria may be present are -
✔✔coliform bacteria
A physical property, as opposed to a chemical property, important to water treatment is -
✔✔turbidity
Which of the following are the two principal chemicals that cause water hardness? -
✔✔Calcium and magnesium
Which of the following statements about viruses is not correct?
a. Viruses have no independent metabolism and depend on living cells for reproduction
b. Viruses range in diameter from 10 to 25 nanometers (nm), which is smaller that can be seen
with an optical microscope
c. Viruses cannot survive in the environment for any length of time outside of a human's or an
animal's body
d. Some types of viruses can cause acute epidemics of gastroenteritis - ✔✔c. Viruses cannot
survive in the environment for any length of time outside of a human's or and animal's body
Which of the following are commonly used as an indicator of drinking water quality?
a. Protozoan parasites
b. Coliform bacteria
,c. Cryptosporidium oocysts
d. Viruses - ✔✔b. Coliform bacteria
What is the term for the smallest particle that retains the characteristics of the element that it
helps form? - ✔✔Atom
What is a radical? - ✔✔A radical is a group of elements that bond together and act like single
atoms or ions in forming compounds
What measurements are used to express the weight of solute dissolved in a given volume of
solution? - ✔✔Milligrams per liter (mg/L) and grains per gallon (gpg)
Replacing the final digits of a number with zeros, thus expressing the number as tens,
hundreds, thousands, etc., is referred to as - ✔✔rounding
In solving for an unknown value, you must - ✔✔know all the values for all but one of the terms
of the equation to be used
What is the purpose of scientific notation? - ✔✔Scientific notation allows people to express any
number as a term multiplied by a power of 10
In performing treatment plant operations, what can you expect to happen if one of the
operating conditions changes? - ✔✔A proportionate change will occur in some other condition
What is linear measurement? - ✔✔Linear measurement defines the distance along a line; it is
the measurement between two points
Provisions of which regulation are intended to protect drinking water consumers against the
unintended public health consequences associated with consumption of treated drinking water
, containing residual disinfectants and disinfection by-products? - ✔✔Disinfectants and
Disinfection By-products Rule
Under the Stage 1 DBPR, the compliance value for TTHM and HAA5 is determined by calculating
a _____ during the previous 12 months for each DBP for all monitoring locations at each plant. -
✔✔running annual average
Which of the following is not typically a section covered in a sanitary survey? - ✔✔Fire
department hydrants
The maximum contaminant level for arsenic - ✔✔is higher than technically feasible
MCL for Nitrate and Nitrite - ✔✔10 mg/L and 1 mg/L
MCL for Fluoride - ✔✔4.0 mg/L
MCL for TTHM and HAA5 - ✔✔0.080 mg/L and 0.060 mg/L
MCL for Arsenic - ✔✔0.010 mg/L
List and explain the treatment technic requirements for the following: Copper, Lead - ✔✔Action
levels of 1.3 mg/L and 0.015 mg/L
Explain the regulations for microbiological contaminates included in the total coliform rule and
its revisions. - ✔✔MCL goal is zero for E. coli. Total coliform positive samples require three
repeat samples tested for E. coli, A positive E. coli repeat sample triggers a violation notice and
further actions to eliminate the contamination
