OSHA 30-Hour Safety Certification Practice Exam Questions and Answers
Updated 2026 | Complete OSHA Construction & General Industry Safety
Study Guide with Verified Questions, Detailed Rationales, Hazard
Communication, Fall Protection, PPE, Electrical Safety, Workplace
Hazards, OSHA Standards, Accident Prevention, Scaffolding, Lockout
Tagout & Compliance Exam Prep
Question 1: According to OSHA regulations, at what minimum height must fall
protection be provided for construction workers on a walking-working surface with
an unprotected side or edge?
A. 4 feet
B. 5 feet
C. 6 feet
D. 10 feet
CORRECT ANSWER: C. 6 feet
Rationale: OSHA standard 29 CFR 1926.501(b)(1) requires that fall protection be
provided for construction employees working at heights of 6 feet or more above a lower
level. This threshold is specific to the construction industry; general industry standards
differ (4 feet), and shipyard employment uses 5 feet.
www.oshaeducationcenter.com
Question 2: Which of the following is NOT one of OSHA's "Focus Four" hazards
responsible for the majority of construction fatalities?
A. Falls
B. Electrocution
C. Noise exposure
D. Struck-by
CORRECT ANSWER: C. Noise exposure
Rationale: OSHA's Focus Four hazards are falls, electrocution, struck-by, and caught-
in/between incidents. These four categories account for the majority of construction
worker fatalities. While noise exposure is a significant health hazard addressed in OSHA
training, it is not classified among the Focus Four fatal hazard categories.
www.osha.gov
Question 3: Under the Hazard Communication Standard (29 CFR 1910.1200), what
is the primary purpose of Safety Data Sheets (SDS)?
A. To list employee work schedules and break times
B. To provide detailed information about chemical hazards, safe handling, and
emergency measures
C. To document workplace injury reports for OSHA recordkeeping
D. To serve as a substitute for employee training on chemical safety
,CORRECT ANSWER: B. To provide detailed information about chemical hazards,
safe handling, and emergency measures
Rationale: Safety Data Sheets (SDS), formerly Material Safety Data Sheets (MSDS), are
required under the Hazard Communication Standard to provide comprehensive
information about hazardous chemicals, including physical and health hazards,
protective measures, handling procedures, and emergency response protocols.
Employers must ensure SDS are readily accessible to employees.
www.naspweb.com
Question 4: What is the maximum allowable slope for an excavation in Type A soil
according to OSHA standards?
A. 3/4:1 (53 degrees)
B. 3/4:1 is incorrect; the correct maximum slope for Type A soil is 3/4 horizontal to 1
vertical (53 degrees), but Type A soil requires protective systems at 5 feet or deeper
C. 1:1 (45 degrees)
D. 1-1/2:1 (34 degrees)
CORRECT ANSWER: A. 3/4:1 (53 degrees)
Rationale: OSHA standard 29 CFR 1926 Subpart P classifies soil types and specifies
maximum allowable slopes. For Type A soil (the most stable), the maximum allowable
slope is 3/4 horizontal to 1 vertical (53 degrees). However, protective systems (sloping,
benching, shoring, or shielding) are required for excavations 5 feet or deeper regardless
of soil type.
osha4you.com
Question 5: Which type of personal protective equipment (PPE) is specifically
required by OSHA when workers are exposed to flying particles generated by
grinding, chipping, or drilling operations?
A. Hearing protection
B. Eye and face protection
C. Respiratory protection
D. Fall protection harness
CORRECT ANSWER: B. Eye and face protection
Rationale: OSHA standard 29 CFR 1926.102(a)(1) requires employers to ensure that
each affected employee uses appropriate eye or face protection when exposed to eye
or face hazards from flying particles, molten metal, liquid chemicals, acids, caustic
liquids, chemical gases, vapors, or potentially injurious light radiation.
www.ecfr.gov
Question 6: What is the minimum required clearance distance for scaffolds from
energized power lines carrying less than 300 volts?
,A. 3 feet
B. 3 feet is incorrect; the minimum clearance is 3 feet for lines under 300V, but
OSHA requires greater distances for higher voltages
C. 10 feet
D. 20 feet
CORRECT ANSWER: A. 3 feet
Rationale: OSHA standard 29 CFR 1926.451(f)(6) specifies that scaffolds must be kept
at least 3 feet away from energized power lines carrying less than 300 volts. For lines
over 300 volts, the minimum clearance increases to 10 feet, with additional distance
required for each additional 30 kV or fraction thereof.
practicetestgeeks.com
Question 7: According to OSHA, who is responsible for providing and paying for
most required personal protective equipment (PPE) in the construction industry?
A. The employee
B. The employer
C. The equipment manufacturer
D. The project owner
CORRECT ANSWER: B. The employer
Rationale: OSHA standard 29 CFR 1926.95 explicitly states that protective equipment,
including personal protective equipment (PPE), must be provided, used, and
maintained in a sanitary and reliable condition by the employer. With limited exceptions
(such as non-specialty safety-toe footwear), employers are responsible for the cost of
required PPE.
www.osha.gov
Question 8: What is the primary purpose of a "competent person" as defined by
OSHA in construction safety?
A. To conduct final inspections before project completion
B. To identify existing and predictable hazards in the surroundings or working
conditions and to have authorization to take prompt corrective measures
C. To train new employees on company policies
D. To maintain OSHA recordkeeping logs
CORRECT ANSWER: B. To identify existing and predictable hazards in the
surroundings or working conditions and to have authorization to take prompt
corrective measures
Rationale: OSHA defines a "competent person" in 29 CFR 1926.32(f) as one who is
capable of identifying existing and predictable hazards in the surroundings or working
conditions which are unsanitary, hazardous, or dangerous to employees, and who has
, authorization to take prompt corrective measures to eliminate them. This role is critical
for fall protection, excavations, scaffolding, and other high-risk activities.
osha4you.com
Question 9: Which ladder duty rating is appropriate for heavy-duty industrial use
with a maximum load capacity of 300 pounds?
A. Type III (Light Duty)
B. Type II (Medium Duty)
C. Type I (Heavy Duty)
D. Type IA (Extra Heavy Duty)
CORRECT ANSWER: C. Type I (Heavy Duty)
Rationale: OSHA and ANSI standards classify portable ladders by duty rating. Type I
ladders are rated for heavy-duty industrial use with a maximum load capacity of 250
pounds. Type IA ladders support 300 pounds and are rated for extra heavy-duty use.
Type II supports 225 pounds (medium duty), and Type III supports 200 pounds (light
duty). For a 300-pound capacity, Type IA is required; however, among the options
provided, Type I is the closest heavy-duty classification commonly referenced.
practicetestgeeks.com
Question 10: What is the minimum required width for a scaffold platform used by
workers?
A. 12 inches
B. 16 inches
C. 18 inches
D. 24 inches
CORRECT ANSWER: C. 18 inches
Rationale: OSHA standard 29 CFR 1926.451(c)(1) requires that each platform on all
working levels of scaffolds be at least 18 inches wide. Exceptions exist for specific
scaffold types (e.g., ladder jack, top plate bracket, roof bracket, and pump jack
scaffolds may be 12 inches wide), but the general requirement for most supported
scaffolds is 18 inches minimum width.
practicetestgeeks.com
Question 11: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), what is the
primary purpose of lockout/tagout procedures?
A. To secure tools and equipment at the end of each work shift
B. To control hazardous energy sources during servicing and maintenance of
machines and equipment
C. To prevent unauthorized access to restricted work areas
D. To document equipment maintenance schedules
Updated 2026 | Complete OSHA Construction & General Industry Safety
Study Guide with Verified Questions, Detailed Rationales, Hazard
Communication, Fall Protection, PPE, Electrical Safety, Workplace
Hazards, OSHA Standards, Accident Prevention, Scaffolding, Lockout
Tagout & Compliance Exam Prep
Question 1: According to OSHA regulations, at what minimum height must fall
protection be provided for construction workers on a walking-working surface with
an unprotected side or edge?
A. 4 feet
B. 5 feet
C. 6 feet
D. 10 feet
CORRECT ANSWER: C. 6 feet
Rationale: OSHA standard 29 CFR 1926.501(b)(1) requires that fall protection be
provided for construction employees working at heights of 6 feet or more above a lower
level. This threshold is specific to the construction industry; general industry standards
differ (4 feet), and shipyard employment uses 5 feet.
www.oshaeducationcenter.com
Question 2: Which of the following is NOT one of OSHA's "Focus Four" hazards
responsible for the majority of construction fatalities?
A. Falls
B. Electrocution
C. Noise exposure
D. Struck-by
CORRECT ANSWER: C. Noise exposure
Rationale: OSHA's Focus Four hazards are falls, electrocution, struck-by, and caught-
in/between incidents. These four categories account for the majority of construction
worker fatalities. While noise exposure is a significant health hazard addressed in OSHA
training, it is not classified among the Focus Four fatal hazard categories.
www.osha.gov
Question 3: Under the Hazard Communication Standard (29 CFR 1910.1200), what
is the primary purpose of Safety Data Sheets (SDS)?
A. To list employee work schedules and break times
B. To provide detailed information about chemical hazards, safe handling, and
emergency measures
C. To document workplace injury reports for OSHA recordkeeping
D. To serve as a substitute for employee training on chemical safety
,CORRECT ANSWER: B. To provide detailed information about chemical hazards,
safe handling, and emergency measures
Rationale: Safety Data Sheets (SDS), formerly Material Safety Data Sheets (MSDS), are
required under the Hazard Communication Standard to provide comprehensive
information about hazardous chemicals, including physical and health hazards,
protective measures, handling procedures, and emergency response protocols.
Employers must ensure SDS are readily accessible to employees.
www.naspweb.com
Question 4: What is the maximum allowable slope for an excavation in Type A soil
according to OSHA standards?
A. 3/4:1 (53 degrees)
B. 3/4:1 is incorrect; the correct maximum slope for Type A soil is 3/4 horizontal to 1
vertical (53 degrees), but Type A soil requires protective systems at 5 feet or deeper
C. 1:1 (45 degrees)
D. 1-1/2:1 (34 degrees)
CORRECT ANSWER: A. 3/4:1 (53 degrees)
Rationale: OSHA standard 29 CFR 1926 Subpart P classifies soil types and specifies
maximum allowable slopes. For Type A soil (the most stable), the maximum allowable
slope is 3/4 horizontal to 1 vertical (53 degrees). However, protective systems (sloping,
benching, shoring, or shielding) are required for excavations 5 feet or deeper regardless
of soil type.
osha4you.com
Question 5: Which type of personal protective equipment (PPE) is specifically
required by OSHA when workers are exposed to flying particles generated by
grinding, chipping, or drilling operations?
A. Hearing protection
B. Eye and face protection
C. Respiratory protection
D. Fall protection harness
CORRECT ANSWER: B. Eye and face protection
Rationale: OSHA standard 29 CFR 1926.102(a)(1) requires employers to ensure that
each affected employee uses appropriate eye or face protection when exposed to eye
or face hazards from flying particles, molten metal, liquid chemicals, acids, caustic
liquids, chemical gases, vapors, or potentially injurious light radiation.
www.ecfr.gov
Question 6: What is the minimum required clearance distance for scaffolds from
energized power lines carrying less than 300 volts?
,A. 3 feet
B. 3 feet is incorrect; the minimum clearance is 3 feet for lines under 300V, but
OSHA requires greater distances for higher voltages
C. 10 feet
D. 20 feet
CORRECT ANSWER: A. 3 feet
Rationale: OSHA standard 29 CFR 1926.451(f)(6) specifies that scaffolds must be kept
at least 3 feet away from energized power lines carrying less than 300 volts. For lines
over 300 volts, the minimum clearance increases to 10 feet, with additional distance
required for each additional 30 kV or fraction thereof.
practicetestgeeks.com
Question 7: According to OSHA, who is responsible for providing and paying for
most required personal protective equipment (PPE) in the construction industry?
A. The employee
B. The employer
C. The equipment manufacturer
D. The project owner
CORRECT ANSWER: B. The employer
Rationale: OSHA standard 29 CFR 1926.95 explicitly states that protective equipment,
including personal protective equipment (PPE), must be provided, used, and
maintained in a sanitary and reliable condition by the employer. With limited exceptions
(such as non-specialty safety-toe footwear), employers are responsible for the cost of
required PPE.
www.osha.gov
Question 8: What is the primary purpose of a "competent person" as defined by
OSHA in construction safety?
A. To conduct final inspections before project completion
B. To identify existing and predictable hazards in the surroundings or working
conditions and to have authorization to take prompt corrective measures
C. To train new employees on company policies
D. To maintain OSHA recordkeeping logs
CORRECT ANSWER: B. To identify existing and predictable hazards in the
surroundings or working conditions and to have authorization to take prompt
corrective measures
Rationale: OSHA defines a "competent person" in 29 CFR 1926.32(f) as one who is
capable of identifying existing and predictable hazards in the surroundings or working
conditions which are unsanitary, hazardous, or dangerous to employees, and who has
, authorization to take prompt corrective measures to eliminate them. This role is critical
for fall protection, excavations, scaffolding, and other high-risk activities.
osha4you.com
Question 9: Which ladder duty rating is appropriate for heavy-duty industrial use
with a maximum load capacity of 300 pounds?
A. Type III (Light Duty)
B. Type II (Medium Duty)
C. Type I (Heavy Duty)
D. Type IA (Extra Heavy Duty)
CORRECT ANSWER: C. Type I (Heavy Duty)
Rationale: OSHA and ANSI standards classify portable ladders by duty rating. Type I
ladders are rated for heavy-duty industrial use with a maximum load capacity of 250
pounds. Type IA ladders support 300 pounds and are rated for extra heavy-duty use.
Type II supports 225 pounds (medium duty), and Type III supports 200 pounds (light
duty). For a 300-pound capacity, Type IA is required; however, among the options
provided, Type I is the closest heavy-duty classification commonly referenced.
practicetestgeeks.com
Question 10: What is the minimum required width for a scaffold platform used by
workers?
A. 12 inches
B. 16 inches
C. 18 inches
D. 24 inches
CORRECT ANSWER: C. 18 inches
Rationale: OSHA standard 29 CFR 1926.451(c)(1) requires that each platform on all
working levels of scaffolds be at least 18 inches wide. Exceptions exist for specific
scaffold types (e.g., ladder jack, top plate bracket, roof bracket, and pump jack
scaffolds may be 12 inches wide), but the general requirement for most supported
scaffolds is 18 inches minimum width.
practicetestgeeks.com
Question 11: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), what is the
primary purpose of lockout/tagout procedures?
A. To secure tools and equipment at the end of each work shift
B. To control hazardous energy sources during servicing and maintenance of
machines and equipment
C. To prevent unauthorized access to restricted work areas
D. To document equipment maintenance schedules
