EPA 608 CORE TEST SAMPLE QUESTIONS
2026 COMPREHENSIVE PRACTICE
QUESTIONS AND VERIFIED CORRECT
ANSWERS WITH DETAILED RATIONALES
EPA SECTION 608 CORE CERTIFICATION
STUDY GUIDE
R-410A - CORRECT ANSWER -R-503
Montreal Protocol is signed in which of the following year:
1994
1995 As of what date did it become unlawful to release Class 1 and Class II
refrigerants to the atmosphere?
a. July 1, 1992
b. July 1, 1993
c. November 14, 1994
d. January 1, 1996 - CORRECT ANSWER -a. July 1, 1992
What is the ozone layer and why is it important to us on Earth?
a. Thin layer of R-22 in the atmosphere that filters UV.
b. Protective shield for Earth from the sun's harmful ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
,earth
c. Thin layer of CFC and HCFC in the atmosphere that filters UV.
d. Protective layer that shields UV in the Troposphere - CORRECT ANSWER
-b. Protective shield for Earth from the sun's harmful ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
earth
The atom found in CFC and HCFC refrigerants that destroys ozone in the
stratosphere is?
a. Fluorine
b. Carbon
c. Hydrogen
d. Chlorine - CORRECT ANSWER -d. Chlorine
What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia. - CORRECT ANSWER -Three oxygen atoms (O3).
Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
,d. R-12 - CORRECT ANSWER -d. R-12
What is the name of the atom that attacks ozone molecules?
a. CFC atoms
b. HCFC atoms
c. Chlorine and bromine atoms emitted into the atmosphere
d. a and b - CORRECT ANSWER -c. Chlorine and bromine atoms emitted
into the atmosphere
Which refrigerant is a HFC?
a. R-134A
b. R-123
c. R-22
d. R-12 - CORRECT ANSWER -a. R-134A
Describe how one Chlorine atom can destroy 100,000 ozone molecules.
a. Chlorine releases one of the oxygen atoms and forms two O2 oxygen
molecules, leaving the chlorine molecule free to attack another
ozone molecule and repeat the process.
b. Chlorine locks up the ozone molecule and then and then goes after
another.
c. Chlorine converts the ozone to bromine and then attacks more ozone
molecules.
, d. Chlorine can bleach 100,000 ozone molecules before it weakens. -
CORRECT ANSWER -a. Chlorine releases one of the oxygen atoms and forms
two O2 oxygen molecules, leaving the chlorine molecule free to attack
another
ozone molecule and repeat the process.
Which refrigerant contains no chlorine?
a. R-134A
b. R-123
c. R-22
d. R-12 - CORRECT ANSWER -a. R-134A
Name the refrigerant types that belong to CFCs, HCFCs and HFCs
a. CFC R-11, R-12, R-500
b. HCFC R-22, R-123
c. HFC R-134a
d. All of the above are correct - CORRECT ANSWER -d. All of the above are
correct
The rule of thumb for refilling approved cylinders is a maximum of ___
percent
liquid?
a. 60%
b. 79%
c. 80%
2026 COMPREHENSIVE PRACTICE
QUESTIONS AND VERIFIED CORRECT
ANSWERS WITH DETAILED RATIONALES
EPA SECTION 608 CORE CERTIFICATION
STUDY GUIDE
R-410A - CORRECT ANSWER -R-503
Montreal Protocol is signed in which of the following year:
1994
1995 As of what date did it become unlawful to release Class 1 and Class II
refrigerants to the atmosphere?
a. July 1, 1992
b. July 1, 1993
c. November 14, 1994
d. January 1, 1996 - CORRECT ANSWER -a. July 1, 1992
What is the ozone layer and why is it important to us on Earth?
a. Thin layer of R-22 in the atmosphere that filters UV.
b. Protective shield for Earth from the sun's harmful ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
,earth
c. Thin layer of CFC and HCFC in the atmosphere that filters UV.
d. Protective layer that shields UV in the Troposphere - CORRECT ANSWER
-b. Protective shield for Earth from the sun's harmful ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above
earth
The atom found in CFC and HCFC refrigerants that destroys ozone in the
stratosphere is?
a. Fluorine
b. Carbon
c. Hydrogen
d. Chlorine - CORRECT ANSWER -d. Chlorine
What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia. - CORRECT ANSWER -Three oxygen atoms (O3).
Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
,d. R-12 - CORRECT ANSWER -d. R-12
What is the name of the atom that attacks ozone molecules?
a. CFC atoms
b. HCFC atoms
c. Chlorine and bromine atoms emitted into the atmosphere
d. a and b - CORRECT ANSWER -c. Chlorine and bromine atoms emitted
into the atmosphere
Which refrigerant is a HFC?
a. R-134A
b. R-123
c. R-22
d. R-12 - CORRECT ANSWER -a. R-134A
Describe how one Chlorine atom can destroy 100,000 ozone molecules.
a. Chlorine releases one of the oxygen atoms and forms two O2 oxygen
molecules, leaving the chlorine molecule free to attack another
ozone molecule and repeat the process.
b. Chlorine locks up the ozone molecule and then and then goes after
another.
c. Chlorine converts the ozone to bromine and then attacks more ozone
molecules.
, d. Chlorine can bleach 100,000 ozone molecules before it weakens. -
CORRECT ANSWER -a. Chlorine releases one of the oxygen atoms and forms
two O2 oxygen molecules, leaving the chlorine molecule free to attack
another
ozone molecule and repeat the process.
Which refrigerant contains no chlorine?
a. R-134A
b. R-123
c. R-22
d. R-12 - CORRECT ANSWER -a. R-134A
Name the refrigerant types that belong to CFCs, HCFCs and HFCs
a. CFC R-11, R-12, R-500
b. HCFC R-22, R-123
c. HFC R-134a
d. All of the above are correct - CORRECT ANSWER -d. All of the above are
correct
The rule of thumb for refilling approved cylinders is a maximum of ___
percent
liquid?
a. 60%
b. 79%
c. 80%
