WASTEWATER OPERATOR GRADE 1 CERTIFICATION: EXAM STUDY
GUIDE QUESTIONS WITH COMPLETE SOLUTIONS
Basic Chemistry:
1) What piece of laboratory glassware is primarily used to mix chemicals and
measure approximately volumes? -- Answer ✔✔ beaker
2) The electrical potential between two points is measured in -- Answer ✔✔ volts
3) What is the most common use today for a positive-displacement pump -- Answer
✔✔ chemical feed pump
4) Which lab glassware will give the most accurate measurements of liquids --
Answer ✔✔ burettes
5) Which lab glassware is used for measuring volumes -- Answer ✔✔ graduated
cylinders
6) People working in and around wastewater must be immunized for -- Answer ✔✔
tetanus
, 7) Which lab tests has a zero holding time -- Answer ✔✔ chlorine residual
8) Which one of the following statements concerning colloids is false?
a) solutes have a greater effect on freezing and boiling points of liquids
than do colloids
b) only very small colloids will pass through a semipermeable membrane
c) the average wavelength of white light is smaller than the dimensions of
colloidal particles
d) dialysis is the separation of colloids from solutes through a
semipermeable membrane -- Answer ✔✔ d. dialysis is the separation of
colloids from solutes through a semipermeable membrane
9) Describe "colloids" -- Answer ✔✔ an ion opposite in charge to a colloidal
particle will force its way into the colloidal particle
10) Water is used as a standard because it has unique properties and is readily
available in its pure state. Which standard is not correct?
a) Celsius scale
b) the calorie
c) the kilogram
d) specific gravity -- Answer ✔✔ the kilogram
GUIDE QUESTIONS WITH COMPLETE SOLUTIONS
Basic Chemistry:
1) What piece of laboratory glassware is primarily used to mix chemicals and
measure approximately volumes? -- Answer ✔✔ beaker
2) The electrical potential between two points is measured in -- Answer ✔✔ volts
3) What is the most common use today for a positive-displacement pump -- Answer
✔✔ chemical feed pump
4) Which lab glassware will give the most accurate measurements of liquids --
Answer ✔✔ burettes
5) Which lab glassware is used for measuring volumes -- Answer ✔✔ graduated
cylinders
6) People working in and around wastewater must be immunized for -- Answer ✔✔
tetanus
, 7) Which lab tests has a zero holding time -- Answer ✔✔ chlorine residual
8) Which one of the following statements concerning colloids is false?
a) solutes have a greater effect on freezing and boiling points of liquids
than do colloids
b) only very small colloids will pass through a semipermeable membrane
c) the average wavelength of white light is smaller than the dimensions of
colloidal particles
d) dialysis is the separation of colloids from solutes through a
semipermeable membrane -- Answer ✔✔ d. dialysis is the separation of
colloids from solutes through a semipermeable membrane
9) Describe "colloids" -- Answer ✔✔ an ion opposite in charge to a colloidal
particle will force its way into the colloidal particle
10) Water is used as a standard because it has unique properties and is readily
available in its pure state. Which standard is not correct?
a) Celsius scale
b) the calorie
c) the kilogram
d) specific gravity -- Answer ✔✔ the kilogram
