CHMM PRACTICE STUDY
TEST EXAM QUESTIONS
AND CORRECT ANSWERS
GRADED A+ 2025-2026
When polonium (atomic mass 210 & atomic number 84) emits an alpha particle, which
of the following decay products results?
a. Bismuth (atomic mass 209 & atomic number 83)
b. Lead (atomic mass 206 & atomic number 82)
c. Thallium (atomic mass 204 & atomic number 81)
d. Mercury (atomic mass 201 & atomic number 80) - ANS-b. Lead (atomic mass 206 &
atomic number 82)
Atomic Mass is:
a. the number of protons in the nucleus
b. the total number of protons & neutrons in the nucleus
c. a nuclear particle that has an atomic weight of one and is electrically neutral
d. a particle that contains all the positive charge and essentially all the weight of the
atom - ANS-b. the total number of protons & neutrons in the nucleus
Which of the following is not a chemical asphyxiant?
a. carbon monoxide
b. carbon dioxide
c. hydrogen sulfide
d. hydrogen cyanide - ANS-c. hydrogen sulfide
Which of the following displaces oxygen but does not actually interfere with
the human body's ability to use oxygen?
a. carbon dioxide
b. nitrogen
,c. noble gases
d. all of the above - ANS-d. all of the above
Which of the following statements regarding oxidation is always correct?
a. oxygen must be a chemical reactant for an oxidation reaction to occur
b. oxidation is a violent reaction that always produces heat and light
c. oxidation always results in at least one electron being transferred from one atom to
another
d. the valence of the atom is reduced occurs when it gives up an oxidation electron -
ANS-c. oxidation always results in at least one electron being transferred from one
atom to another
Which of the following seven steps for preparing hazardous materials for transport is
in the correct order?
a. proper shipping name, classify, package, mark, label, paperwork, placard
b. classify, proper shipping name, package, mark, label, paperwork, placard
c. package, classify, proper shipping name, mark, label, paperwork, placard
d. package, mark, label, classify, proper shipping name, paperwork, placard - ANS-b.
classify, proper shipping name, package, mark, label, paperwork, placard
Boiling Point is the temperature at which:
a. the vapor pressure of a solid just equals atmospheric pressure
b. the vapor pressure of a liquid is greater than atmospheric pressure
c. the vapor pressure of a liquid is less than atmospheric pressure
d. the vapor pressure of a liquid just equals atmospheric pressure - ANS-d. the vapor
pressure of a liquid just equals atmospheric pressure
Flash point is the:
a. maximum temperature of a liquid at which it give off vapors sufficient to form an
ignitable mixture with air
b. maximum temperature of a liquid at which it gives off vapors sufficient to form an
ignitable mixture with water
c. minimum temperature of a liquid at which it gives off vapors sufficient to form an
ignitable mixture with air
d. minimum temperature of a liquid at which it gives off vapors sufficient to form an
ignitable mixture with water - ANS-c. minimum temperature of a liquid at which it
gives off vapors sufficient to form an ignitable mixture with air
, BLEVE is the acronym for:
a. Boiling Liquids Evaporate Very Expensively
b. Boiling Liquids Erode Very Efficiently
c. Boiling Liquids End Vapor Explosions
d. Boiling Liquid Expanding Vapor Explosion - ANS-d. Boiling Liquid Expanding Vapor
Explosion
Cobalt-60 has a 5 year half life. If the initial activity of a Cobalt-60 source is 20 mCi,
what is the activity after 10 years in mCi?
a. 5
b. 0
c. 2
d. 10 - ANS-a. 5
The exposure rate at a distance of 1 foot from a radioactive source is 20 rnR/hr. What
is the exposure rate in mR/hr. at 10 feet?
a. 0.1
b. 0.2
c. 0.3
d. 0.4 - ANS-b. 0.2
Which of the following is not regulated by EPA as an environmentally toxic metal?
a. arsenic
b. lead
c. cadmium
d. iron - ANS-d. iron
Which of the following chemicals is heavier than air?
Chemical Name Vapor Density
a. Methane 0.55
b. Carbon Monoxide 0.97
c. Nitrogen 0.97
d. Propane 1.52 - ANS-d. Propane 1.52
Which federal statute regulates both stationary and mobile pollutant sources?
TEST EXAM QUESTIONS
AND CORRECT ANSWERS
GRADED A+ 2025-2026
When polonium (atomic mass 210 & atomic number 84) emits an alpha particle, which
of the following decay products results?
a. Bismuth (atomic mass 209 & atomic number 83)
b. Lead (atomic mass 206 & atomic number 82)
c. Thallium (atomic mass 204 & atomic number 81)
d. Mercury (atomic mass 201 & atomic number 80) - ANS-b. Lead (atomic mass 206 &
atomic number 82)
Atomic Mass is:
a. the number of protons in the nucleus
b. the total number of protons & neutrons in the nucleus
c. a nuclear particle that has an atomic weight of one and is electrically neutral
d. a particle that contains all the positive charge and essentially all the weight of the
atom - ANS-b. the total number of protons & neutrons in the nucleus
Which of the following is not a chemical asphyxiant?
a. carbon monoxide
b. carbon dioxide
c. hydrogen sulfide
d. hydrogen cyanide - ANS-c. hydrogen sulfide
Which of the following displaces oxygen but does not actually interfere with
the human body's ability to use oxygen?
a. carbon dioxide
b. nitrogen
,c. noble gases
d. all of the above - ANS-d. all of the above
Which of the following statements regarding oxidation is always correct?
a. oxygen must be a chemical reactant for an oxidation reaction to occur
b. oxidation is a violent reaction that always produces heat and light
c. oxidation always results in at least one electron being transferred from one atom to
another
d. the valence of the atom is reduced occurs when it gives up an oxidation electron -
ANS-c. oxidation always results in at least one electron being transferred from one
atom to another
Which of the following seven steps for preparing hazardous materials for transport is
in the correct order?
a. proper shipping name, classify, package, mark, label, paperwork, placard
b. classify, proper shipping name, package, mark, label, paperwork, placard
c. package, classify, proper shipping name, mark, label, paperwork, placard
d. package, mark, label, classify, proper shipping name, paperwork, placard - ANS-b.
classify, proper shipping name, package, mark, label, paperwork, placard
Boiling Point is the temperature at which:
a. the vapor pressure of a solid just equals atmospheric pressure
b. the vapor pressure of a liquid is greater than atmospheric pressure
c. the vapor pressure of a liquid is less than atmospheric pressure
d. the vapor pressure of a liquid just equals atmospheric pressure - ANS-d. the vapor
pressure of a liquid just equals atmospheric pressure
Flash point is the:
a. maximum temperature of a liquid at which it give off vapors sufficient to form an
ignitable mixture with air
b. maximum temperature of a liquid at which it gives off vapors sufficient to form an
ignitable mixture with water
c. minimum temperature of a liquid at which it gives off vapors sufficient to form an
ignitable mixture with air
d. minimum temperature of a liquid at which it gives off vapors sufficient to form an
ignitable mixture with water - ANS-c. minimum temperature of a liquid at which it
gives off vapors sufficient to form an ignitable mixture with air
, BLEVE is the acronym for:
a. Boiling Liquids Evaporate Very Expensively
b. Boiling Liquids Erode Very Efficiently
c. Boiling Liquids End Vapor Explosions
d. Boiling Liquid Expanding Vapor Explosion - ANS-d. Boiling Liquid Expanding Vapor
Explosion
Cobalt-60 has a 5 year half life. If the initial activity of a Cobalt-60 source is 20 mCi,
what is the activity after 10 years in mCi?
a. 5
b. 0
c. 2
d. 10 - ANS-a. 5
The exposure rate at a distance of 1 foot from a radioactive source is 20 rnR/hr. What
is the exposure rate in mR/hr. at 10 feet?
a. 0.1
b. 0.2
c. 0.3
d. 0.4 - ANS-b. 0.2
Which of the following is not regulated by EPA as an environmentally toxic metal?
a. arsenic
b. lead
c. cadmium
d. iron - ANS-d. iron
Which of the following chemicals is heavier than air?
Chemical Name Vapor Density
a. Methane 0.55
b. Carbon Monoxide 0.97
c. Nitrogen 0.97
d. Propane 1.52 - ANS-d. Propane 1.52
Which federal statute regulates both stationary and mobile pollutant sources?
