CHST Practice Test Questions and Answers With Verified Solutions 2025
Which of the following is NOT considered a significant factor in determining the outcome of an
electrocution event? - ✔✔1. The amount of electrically resistant material present in work boots and
work gloves.
A Noise-Hazard Control Program (and associated Hearing Conservation Program) is required under
OSHA regulation 29 CFR 1910.95 (Occupational Noise Exposure) where workers may be exposed to
noise levels in excess of an eight -hour-time-weighted average of.. - ✔✔2. 85 decibels (dB)
As per 29 CFR 1910.1001, the allowable eight-hour exposure limit concentration to asbestos fibers is not
to exceed which of the following? - ✔✔3. 0.1 fibers per cm^3 of air
Per OSHA regulations 29 CFR 1910.25-1910.27, the maximum length a single ladder or a single section of
ladder may be is.. - ✔✔4. No greater than 30 feet
Which of the following is NOT stipulated as a hazardous waste material attribute to which the U.S.
Environmental Protection Agency extends a designated waste code (e.g., #D001), as per 40 CFR 261,
Subpart C? - ✔✔5. Mutagenicity
In a construction environment, which of the following types of PPE is most suitable for protecting the
eyes against airborne dust? - ✔✔6. Safety goggles
At what minimum frequency must electrical-insulating gloves be tested to ensure they adequately
protect workers against electrical shock? - ✔✔7. Every six months
The most useful tool that CHST's can potentially use for evaluating system safety levels at smaller-scale
worksites is a(n): - ✔✔8. Job Safety Analysis (JSA)
If 25 or more employees are to be working unserground at the same time, which of the following safety
procedures MUST be in effect? - ✔✔9. Two separate rescue teams must be available. One within 30
minutes travel and the second within two hours travel
,If a five-foot deep trench is dug in clay material, what angle must the trench wall not exceed? - ✔✔10.
53 degrees
"Lifting Index" (LI) is calculated per which of the following? - ✔✔11. Load weight / recommended weight
limit
"Flash Point" is most accurately defined as which of the following? - ✔✔12. The lowest temperature at
which a flammable liquid can form an ignitable mixture in air
Which of the following does a mobile crane operator NOT need to be aware of in order to ensure a safe
lift? - ✔✔13. The width of the jib
To what part of the body does a body harness typically NOT distribute any significant fall-arrest force? -
✔✔14. Lower back
" Recommended weight limit" (RWL) is most accurately defined as which of the following? - ✔✔15. The
weight that healthy workers could lift for up to eight hours without causing injuries
The Heinrich "incident to injury ratio" model states that for every 330 accidents,---- result in no injuries,
---- cause minor injuries, and ---- cause major injuries. - ✔✔16. 300,29,1
Which of the following is regarded as the "three E's of safety"? - ✔✔17. Engineering, Education,
Enforcement
Total case incident rate ( TCIR) is calculated via which of the following? - ✔✔18. (Number of recordable
injuries per year x 200,000) / (total hours worked)
Which type of incident usually accounts for the highest fatality rate in the construction industry? -
✔✔19. Falls
According to OSHA regulation 29 CFR 1926.651, a Stairway, ladder, ramp, or other safe means of egress
shall be locate in trench excavations that are---- feet or more in depth. - ✔✔20. Four feet
, Excavation cave-in protection is ALWAYS required when which of the following conditions are met? -
✔✔21. The excavation mainly comprises of clay or silt, and is greater than five feet in depth
What level of electrical current is enough to potentially result in death? - ✔✔22. 75 milliamperes. ----10
milliamperes will cause painful to severe shock but death usually does not occur below 75 milliamperes.
Which of the following types of construction equipment can NOT make inadvertent contact with
overhead power lines? - ✔✔23. Bulldozers
Which of the following is NOT a recommended course of action for preventing falling -object injuries to
workers below a scaffold? - ✔✔24. A safety buffer zone of 12 feet around the perimeter of a scaffold,
for every 10 feet of elevation, should be employed while the scaffold is in use.
Per OSHA regulation 29 CFR 1926.502, when a 200 pound load is applied in a downward direction to the
top of the edge of a guardrail , it shall not deflect to a height any less than ---- above the walking or
working level. - ✔✔25. 39 Inches
Which of the following is NOT a type of welding? - ✔✔26. Modules welding ----the three common types
are oxygen-fuel gas welding , Arc Welding, Resistance welding.
Which of the following is a common test used to check for cracks in a grinding wheel? - ✔✔27. The "Ring
Test". ----When a wheel of 10cm in diameter or less is tapped with a non metallic object it will emit a
clear ringing sound if undamaged.
Which of the following soil classifications is correct? - ✔✔28. Type "B"- Cohesive soil with a moderate
compressive strength.
Soil classifications are A,B,C, and are all cohesive and start with a high compressive strength, and end
with a low compressive strength
Electrical "Bonding" is best defined as: - ✔✔29. Connecting two or more conductive objects with a
conductor to protect against electrocution
Which of the following is NOT considered a significant factor in determining the outcome of an
electrocution event? - ✔✔1. The amount of electrically resistant material present in work boots and
work gloves.
A Noise-Hazard Control Program (and associated Hearing Conservation Program) is required under
OSHA regulation 29 CFR 1910.95 (Occupational Noise Exposure) where workers may be exposed to
noise levels in excess of an eight -hour-time-weighted average of.. - ✔✔2. 85 decibels (dB)
As per 29 CFR 1910.1001, the allowable eight-hour exposure limit concentration to asbestos fibers is not
to exceed which of the following? - ✔✔3. 0.1 fibers per cm^3 of air
Per OSHA regulations 29 CFR 1910.25-1910.27, the maximum length a single ladder or a single section of
ladder may be is.. - ✔✔4. No greater than 30 feet
Which of the following is NOT stipulated as a hazardous waste material attribute to which the U.S.
Environmental Protection Agency extends a designated waste code (e.g., #D001), as per 40 CFR 261,
Subpart C? - ✔✔5. Mutagenicity
In a construction environment, which of the following types of PPE is most suitable for protecting the
eyes against airborne dust? - ✔✔6. Safety goggles
At what minimum frequency must electrical-insulating gloves be tested to ensure they adequately
protect workers against electrical shock? - ✔✔7. Every six months
The most useful tool that CHST's can potentially use for evaluating system safety levels at smaller-scale
worksites is a(n): - ✔✔8. Job Safety Analysis (JSA)
If 25 or more employees are to be working unserground at the same time, which of the following safety
procedures MUST be in effect? - ✔✔9. Two separate rescue teams must be available. One within 30
minutes travel and the second within two hours travel
,If a five-foot deep trench is dug in clay material, what angle must the trench wall not exceed? - ✔✔10.
53 degrees
"Lifting Index" (LI) is calculated per which of the following? - ✔✔11. Load weight / recommended weight
limit
"Flash Point" is most accurately defined as which of the following? - ✔✔12. The lowest temperature at
which a flammable liquid can form an ignitable mixture in air
Which of the following does a mobile crane operator NOT need to be aware of in order to ensure a safe
lift? - ✔✔13. The width of the jib
To what part of the body does a body harness typically NOT distribute any significant fall-arrest force? -
✔✔14. Lower back
" Recommended weight limit" (RWL) is most accurately defined as which of the following? - ✔✔15. The
weight that healthy workers could lift for up to eight hours without causing injuries
The Heinrich "incident to injury ratio" model states that for every 330 accidents,---- result in no injuries,
---- cause minor injuries, and ---- cause major injuries. - ✔✔16. 300,29,1
Which of the following is regarded as the "three E's of safety"? - ✔✔17. Engineering, Education,
Enforcement
Total case incident rate ( TCIR) is calculated via which of the following? - ✔✔18. (Number of recordable
injuries per year x 200,000) / (total hours worked)
Which type of incident usually accounts for the highest fatality rate in the construction industry? -
✔✔19. Falls
According to OSHA regulation 29 CFR 1926.651, a Stairway, ladder, ramp, or other safe means of egress
shall be locate in trench excavations that are---- feet or more in depth. - ✔✔20. Four feet
, Excavation cave-in protection is ALWAYS required when which of the following conditions are met? -
✔✔21. The excavation mainly comprises of clay or silt, and is greater than five feet in depth
What level of electrical current is enough to potentially result in death? - ✔✔22. 75 milliamperes. ----10
milliamperes will cause painful to severe shock but death usually does not occur below 75 milliamperes.
Which of the following types of construction equipment can NOT make inadvertent contact with
overhead power lines? - ✔✔23. Bulldozers
Which of the following is NOT a recommended course of action for preventing falling -object injuries to
workers below a scaffold? - ✔✔24. A safety buffer zone of 12 feet around the perimeter of a scaffold,
for every 10 feet of elevation, should be employed while the scaffold is in use.
Per OSHA regulation 29 CFR 1926.502, when a 200 pound load is applied in a downward direction to the
top of the edge of a guardrail , it shall not deflect to a height any less than ---- above the walking or
working level. - ✔✔25. 39 Inches
Which of the following is NOT a type of welding? - ✔✔26. Modules welding ----the three common types
are oxygen-fuel gas welding , Arc Welding, Resistance welding.
Which of the following is a common test used to check for cracks in a grinding wheel? - ✔✔27. The "Ring
Test". ----When a wheel of 10cm in diameter or less is tapped with a non metallic object it will emit a
clear ringing sound if undamaged.
Which of the following soil classifications is correct? - ✔✔28. Type "B"- Cohesive soil with a moderate
compressive strength.
Soil classifications are A,B,C, and are all cohesive and start with a high compressive strength, and end
with a low compressive strength
Electrical "Bonding" is best defined as: - ✔✔29. Connecting two or more conductive objects with a
conductor to protect against electrocution
