CWEA PRACTICE EXAM TEST FOR
GRADE 2 COLLECTIONS 2025 GUIDE
LATEST SOLUTIONS.
1. Why are gasoline and volatile solvents objectionable when present in a
sewer?
Correct Answer: They produce an explosion hazard.
Explanation: These substances are highly flammable and can produce
explosive vapors, creating a serious hazard in confined spaces like sewers.
2. You should never attempt to install, troubleshoot, maintain, repair, or
replace electrical equipment unless:
Correct Answer: You know what you are doing, are qualified, and are
authorized.
Explanation: Handling electrical systems without proper training can lead to
electrocution, fires, or equipment damage.
3. How many different areas of traffic zones are there when working in
roadways?
Correct Answer: Five
Explanation: The five areas are Advance Warning, Transition, Activity, Buffer,
and Termination zones, each with a specific function for safety and traffic
control.
4. Why should hydrogen sulfide be controlled?
, Correct Answer: To protect sewers and structures from corrosion
Explanation: H₂S gas forms sulfuric acid in moist environments, corroding
concrete and metal sewer components.
5. Personnel entering a Permit Required Confined Space must have the
following training:
Correct Answer: Entry and rescue procedures
Explanation: OSHA requires specific training to ensure safe entry and
emergency response in confined spaces.
6. To find proper protective gear before application of a product, you
would:
Correct Answer: Look at the MSDS (Material Safety Data Sheet)
Explanation: The MSDS lists the hazards of a material and the required PPE
for safe handling.
7. The gas most commonly associated with septic wastewater is:
Correct Answer: Hydrogen Sulfide (H₂S)
Explanation: Anaerobic decomposition of organic matter in septic systems
releases H₂S, a toxic and flammable gas.
8. The lack of an unpleasant odor in a structure does not always mean that
dangerous gases are not present because:
Correct Answer: Some dangerous gases have no odor
Explanation: Gases like carbon monoxide are odorless and can be lethal
without detection equipment.
GRADE 2 COLLECTIONS 2025 GUIDE
LATEST SOLUTIONS.
1. Why are gasoline and volatile solvents objectionable when present in a
sewer?
Correct Answer: They produce an explosion hazard.
Explanation: These substances are highly flammable and can produce
explosive vapors, creating a serious hazard in confined spaces like sewers.
2. You should never attempt to install, troubleshoot, maintain, repair, or
replace electrical equipment unless:
Correct Answer: You know what you are doing, are qualified, and are
authorized.
Explanation: Handling electrical systems without proper training can lead to
electrocution, fires, or equipment damage.
3. How many different areas of traffic zones are there when working in
roadways?
Correct Answer: Five
Explanation: The five areas are Advance Warning, Transition, Activity, Buffer,
and Termination zones, each with a specific function for safety and traffic
control.
4. Why should hydrogen sulfide be controlled?
, Correct Answer: To protect sewers and structures from corrosion
Explanation: H₂S gas forms sulfuric acid in moist environments, corroding
concrete and metal sewer components.
5. Personnel entering a Permit Required Confined Space must have the
following training:
Correct Answer: Entry and rescue procedures
Explanation: OSHA requires specific training to ensure safe entry and
emergency response in confined spaces.
6. To find proper protective gear before application of a product, you
would:
Correct Answer: Look at the MSDS (Material Safety Data Sheet)
Explanation: The MSDS lists the hazards of a material and the required PPE
for safe handling.
7. The gas most commonly associated with septic wastewater is:
Correct Answer: Hydrogen Sulfide (H₂S)
Explanation: Anaerobic decomposition of organic matter in septic systems
releases H₂S, a toxic and flammable gas.
8. The lack of an unpleasant odor in a structure does not always mean that
dangerous gases are not present because:
Correct Answer: Some dangerous gases have no odor
Explanation: Gases like carbon monoxide are odorless and can be lethal
without detection equipment.
