OSHA 510: OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR
CONSTRUCTION COMPLETE EXAM QUESTIONS AND FULLY
EXPLAINED ANSWERS NEWEST VERSION 2026/2027
Q1. What is the employer's primary obligation under the OSHA Construction
Safety Standard?
ANSWER : Employers must initiate and maintain programs to provide safe
and healthful employment and places of employment, free from recognized
hazards likely to cause death or serious physical harm.
Q2. What does 29 CFR 1926.20 require regarding accident prevention
programs?
ANSWER : Employers must establish and supervise programs to ensure
employee compliance with safety and health standards, including accident
prevention programs for each project.
Q3. Under 29 CFR 1926.21, who is responsible for safety training and
education?
ANSWER : The employer is responsible for instructing employees in the
recognition and avoidance of unsafe conditions, and the regulations applicable
to their work environment.
Q4. What must employers do under the first aid requirements in 29 CFR
1926.23?
ANSWER : Employers must ensure that medical personnel are available for
advice and consultation, and that first aid services are available on the job site.
Q5. What is the OSHA recordkeeping requirement for construction
employers?
ANSWER : Employers with 10 or more employees must maintain OSHA 300
logs, OSHA 300A summary forms, and OSHA 301 incident reports for work-
related injuries and illnesses.
Q6. When must employers post the OSHA Job Safety and Health poster?
, ANSWER : It must be posted in a prominent location where notices to
employees are customarily posted.
Q7. What does 29 CFR 1926.24 require regarding fire protection and
prevention?
ANSWER : The employer shall be responsible for the development and
maintenance of an effective fire protection and prevention program at the job
site throughout all phases of construction.
Q8. What are the housekeeping requirements under 29 CFR 1926.25?
ANSWER : During construction, the form and scrap lumber shall be kept clear
of work areas, passageways, and stairs. Combustible scrap and debris shall be
removed at regular intervals.
Q9. Under 29 CFR 1926.26, what are the illumination requirements for
construction sites?
ANSWER : Construction areas, ramps, runways, corridors, offices, shops, and
storage areas shall be lighted with natural or artificial illumination to meet
specified minimum foot-candle levels.
Q10. What does 29 CFR 1926.28 require regarding personal protective
equipment?
ANSWER : The employer is responsible for requiring the wearing of
appropriate personal protective equipment in all operations where there is an
exposure to hazardous conditions.
SECTION 2: Occupational Health and Environmental Controls (29 CFR 1926
Subpart D)
Q11. What standard regulates silica exposure in construction?
ANSWER : 29 CFR 1926.1153 regulates occupational exposure to respirable
crystalline silica in construction, establishing a PEL of 50 μg/m³ as an 8-hour
TWA.
Q12. What is the action level for respirable crystalline silica in construction?
ANSWER : The action level is 25 μg/m³ as an 8-hour TWA. If exposures are
at or above this level, additional controls and medical surveillance may be
required.
,Q13. What are the requirements for hazard communication (HazCom) under
29 CFR 1926.59?
ANSWER : Employers must implement a written hazard communication
program, maintain Safety Data Sheets (SDS), label containers, and train
employees on chemical hazards.
Q14. What does the lead standard (29 CFR 1926.62) require as the
permissible exposure limit (PEL)?
ANSWER : The PEL for lead in construction is 50 μg/m³ as an 8-hour TWA.
The action level is 30 μg/m³.
Q15. Under the lead standard, when is medical surveillance required?
ANSWER : Medical surveillance is required when an employee is exposed to
lead at or above the action level of 30 μg/m³ for more than 30 days per year.
Q16. What does 29 CFR 1926.51 require for sanitation on construction sites?
ANSWER : Employers must provide adequate toilet facilities (one per 20
employees), drinking water, hand-washing facilities, and waste disposal for
construction workers.
Q17. What is the OSHA standard for noise exposure in construction?
ANSWER : The PEL for noise is 90 dBA as an 8-hour TWA. At 85 dBA, a
hearing conservation program is required. Exposure must be reduced through
engineering controls, administrative controls, or PPE.
Q18. Under 29 CFR 1926.65, what is HAZWOPER?
ANSWER : HAZWOPER (Hazardous Waste Operations and Emergency
Response) establishes safety requirements for workers involved in hazardous
waste cleanup, remedial actions, and emergency response operations.
Q19. What training is required for general site workers under HAZWOPER?
ANSWER : General site workers must receive 40 hours of off-site instruction
and 3 days of actual field experience under direct supervision of a trained
supervisor.
Q20. What does 29 CFR 1926.55 require for occupational exposure to air
contaminants?
ANSWER : Employee exposure to air contaminants shall not exceed the
ceiling values and time-weighted averages listed in Table Z-1, Z-2, or Z-3 of 29
CFR 1926.55.
, SECTION 3: Personal Protective Equipment (29 CFR 1926 Subpart E)
Q21. When must a hard hat (head protection) be worn on a construction site?
ANSWER : Hard hats must be worn when workers are exposed to falling
objects, bumping the head, or electrical hazards. They must meet ANSI Z89.1
standards.
Q22. What are the three classes of hard hats and their uses?
ANSWER : Class E (Electrical) protects from 20,000 volts; Class G (General)
protects from 2,200 volts; Class C (Conductive) offers no electrical protection
but is lightweight.
Q23. What type of eye protection is required when using power tools that
produce flying particles?
ANSWER : Safety glasses with side shields or goggles meeting ANSI Z87.1
standards must be worn when using power tools that produce flying particles or
debris.
Q24. Under 29 CFR 1926.100, what are the criteria for selecting personal
protective equipment?
ANSWER : PPE must be appropriate for the work and hazards involved, be of
safe design and construction for the work performed, and meet ANSI or other
applicable standards.
Q25. What is the employer's responsibility regarding PPE under OSHA
standards?
ANSWER : Employers must assess the workplace for hazards, select
appropriate PPE, provide training on use and limitations, and ensure proper use,
maintenance, and replacement of PPE.
Q26. What are the hearing protection requirements when noise exceeds 90
dBA?
ANSWER : Employers must implement feasible engineering or administrative
controls; if exposure remains above the PEL, hearing protection (ear plugs or
muffs) must be provided and used.
Q27. What foot protection is required under 29 CFR 1926.96?
ANSWER : Safety-toed footwear must be worn where there is danger of foot
injuries from falling, rolling objects, or objects piercing the sole. Footwear must
meet ANSI Z41 standards.
CONSTRUCTION COMPLETE EXAM QUESTIONS AND FULLY
EXPLAINED ANSWERS NEWEST VERSION 2026/2027
Q1. What is the employer's primary obligation under the OSHA Construction
Safety Standard?
ANSWER : Employers must initiate and maintain programs to provide safe
and healthful employment and places of employment, free from recognized
hazards likely to cause death or serious physical harm.
Q2. What does 29 CFR 1926.20 require regarding accident prevention
programs?
ANSWER : Employers must establish and supervise programs to ensure
employee compliance with safety and health standards, including accident
prevention programs for each project.
Q3. Under 29 CFR 1926.21, who is responsible for safety training and
education?
ANSWER : The employer is responsible for instructing employees in the
recognition and avoidance of unsafe conditions, and the regulations applicable
to their work environment.
Q4. What must employers do under the first aid requirements in 29 CFR
1926.23?
ANSWER : Employers must ensure that medical personnel are available for
advice and consultation, and that first aid services are available on the job site.
Q5. What is the OSHA recordkeeping requirement for construction
employers?
ANSWER : Employers with 10 or more employees must maintain OSHA 300
logs, OSHA 300A summary forms, and OSHA 301 incident reports for work-
related injuries and illnesses.
Q6. When must employers post the OSHA Job Safety and Health poster?
, ANSWER : It must be posted in a prominent location where notices to
employees are customarily posted.
Q7. What does 29 CFR 1926.24 require regarding fire protection and
prevention?
ANSWER : The employer shall be responsible for the development and
maintenance of an effective fire protection and prevention program at the job
site throughout all phases of construction.
Q8. What are the housekeeping requirements under 29 CFR 1926.25?
ANSWER : During construction, the form and scrap lumber shall be kept clear
of work areas, passageways, and stairs. Combustible scrap and debris shall be
removed at regular intervals.
Q9. Under 29 CFR 1926.26, what are the illumination requirements for
construction sites?
ANSWER : Construction areas, ramps, runways, corridors, offices, shops, and
storage areas shall be lighted with natural or artificial illumination to meet
specified minimum foot-candle levels.
Q10. What does 29 CFR 1926.28 require regarding personal protective
equipment?
ANSWER : The employer is responsible for requiring the wearing of
appropriate personal protective equipment in all operations where there is an
exposure to hazardous conditions.
SECTION 2: Occupational Health and Environmental Controls (29 CFR 1926
Subpart D)
Q11. What standard regulates silica exposure in construction?
ANSWER : 29 CFR 1926.1153 regulates occupational exposure to respirable
crystalline silica in construction, establishing a PEL of 50 μg/m³ as an 8-hour
TWA.
Q12. What is the action level for respirable crystalline silica in construction?
ANSWER : The action level is 25 μg/m³ as an 8-hour TWA. If exposures are
at or above this level, additional controls and medical surveillance may be
required.
,Q13. What are the requirements for hazard communication (HazCom) under
29 CFR 1926.59?
ANSWER : Employers must implement a written hazard communication
program, maintain Safety Data Sheets (SDS), label containers, and train
employees on chemical hazards.
Q14. What does the lead standard (29 CFR 1926.62) require as the
permissible exposure limit (PEL)?
ANSWER : The PEL for lead in construction is 50 μg/m³ as an 8-hour TWA.
The action level is 30 μg/m³.
Q15. Under the lead standard, when is medical surveillance required?
ANSWER : Medical surveillance is required when an employee is exposed to
lead at or above the action level of 30 μg/m³ for more than 30 days per year.
Q16. What does 29 CFR 1926.51 require for sanitation on construction sites?
ANSWER : Employers must provide adequate toilet facilities (one per 20
employees), drinking water, hand-washing facilities, and waste disposal for
construction workers.
Q17. What is the OSHA standard for noise exposure in construction?
ANSWER : The PEL for noise is 90 dBA as an 8-hour TWA. At 85 dBA, a
hearing conservation program is required. Exposure must be reduced through
engineering controls, administrative controls, or PPE.
Q18. Under 29 CFR 1926.65, what is HAZWOPER?
ANSWER : HAZWOPER (Hazardous Waste Operations and Emergency
Response) establishes safety requirements for workers involved in hazardous
waste cleanup, remedial actions, and emergency response operations.
Q19. What training is required for general site workers under HAZWOPER?
ANSWER : General site workers must receive 40 hours of off-site instruction
and 3 days of actual field experience under direct supervision of a trained
supervisor.
Q20. What does 29 CFR 1926.55 require for occupational exposure to air
contaminants?
ANSWER : Employee exposure to air contaminants shall not exceed the
ceiling values and time-weighted averages listed in Table Z-1, Z-2, or Z-3 of 29
CFR 1926.55.
, SECTION 3: Personal Protective Equipment (29 CFR 1926 Subpart E)
Q21. When must a hard hat (head protection) be worn on a construction site?
ANSWER : Hard hats must be worn when workers are exposed to falling
objects, bumping the head, or electrical hazards. They must meet ANSI Z89.1
standards.
Q22. What are the three classes of hard hats and their uses?
ANSWER : Class E (Electrical) protects from 20,000 volts; Class G (General)
protects from 2,200 volts; Class C (Conductive) offers no electrical protection
but is lightweight.
Q23. What type of eye protection is required when using power tools that
produce flying particles?
ANSWER : Safety glasses with side shields or goggles meeting ANSI Z87.1
standards must be worn when using power tools that produce flying particles or
debris.
Q24. Under 29 CFR 1926.100, what are the criteria for selecting personal
protective equipment?
ANSWER : PPE must be appropriate for the work and hazards involved, be of
safe design and construction for the work performed, and meet ANSI or other
applicable standards.
Q25. What is the employer's responsibility regarding PPE under OSHA
standards?
ANSWER : Employers must assess the workplace for hazards, select
appropriate PPE, provide training on use and limitations, and ensure proper use,
maintenance, and replacement of PPE.
Q26. What are the hearing protection requirements when noise exceeds 90
dBA?
ANSWER : Employers must implement feasible engineering or administrative
controls; if exposure remains above the PEL, hearing protection (ear plugs or
muffs) must be provided and used.
Q27. What foot protection is required under 29 CFR 1926.96?
ANSWER : Safety-toed footwear must be worn where there is danger of foot
injuries from falling, rolling objects, or objects piercing the sole. Footwear must
meet ANSI Z41 standards.
