OSHA 10-Hour Safety Certification Exam Prep | 200+ Practice Questions with
Verified Answers and Detailed Rationales | Workplace Hazard Identification, OSHA
Safety Standards and Regulations, Construction and General Industry Safety, Fall
Protection, Electrical Safety, Personal Protective Equipment (PPE), Hazard
Communication and Accident Prevention
Question 1: What is the primary purpose of the Occupational Safety and Health
Administration (OSHA)?
A. To provide health insurance coverage for construction workers
B. To ensure safe and healthful working conditions by setting and enforcing standards
C. To manage workers' compensation claims for workplace injuries
D. To certify contractors for federal construction projects
CORRECT ANSWER: B. To ensure safe and healthful working conditions by setting
and enforcing standards
RATIONALE:OSHA was created under the Occupational Safety and Health Act of 1970
with the mission to assure safe and healthful working conditions for workers by setting
and enforcing standards and by providing training, outreach, education, and assistance.
Options A, C, and D describe functions handled by other agencies or entities, not
OSHA's core mandate.
Question 2: Which of the following is NOT a right granted to workers under the OSH
Act?
A. The right to file a complaint with OSHA about workplace hazards
B. The right to receive information and training about workplace hazards
C. The right to refuse to work in any situation they find uncomfortable
D. The right to participate in an OSHA inspection of their workplace
CORRECT ANSWER: C. The right to refuse to work in any situation they find
uncomfortable
RATIONALE:While workers have the right to refuse work under specific, imminent
danger conditions as defined by OSHA, they do not have a blanket right to refuse work
simply because they find a situation uncomfortable. The other options are explicit rights
protected under Section 11(c) and other provisions of the OSH Act.
Question 3: An employer must report a work-related fatality to OSHA within how
many hours?
A. 4 hours
B. 8 hours
C. 24 hours
D. 48 hours
CORRECT ANSWER: B. 8 hours
,RATIONALE:OSHA regulations require employers to report any work-related fatality
within 8 hours of learning about the incident. In-patient hospitalizations, amputations,
or losses of an eye must be reported within 24 hours. This ensures timely investigation
and prevention of future incidents.
Question 4: Which color is typically used on safety signs to indicate caution and
potential hazards that could cause minor or moderate injury?
A. Red
B. Orange
C. Yellow
D. Green
CORRECT ANSWER: C. Yellow
RATIONALE:According to ANSI Z535 and OSHA guidelines, yellow is used for caution
signs to warn of potential hazards that could result in minor or moderate injury. Red
indicates danger or stop, orange warns of dangerous parts of machinery, and green
indicates safety equipment or first aid.
Question 5: What is the maximum allowable slope for an excavation in Type A soil
when no protective system is used?
A. 34 degrees from horizontal
B. 53 degrees from horizontal
C. 45 degrees from horizontal
D. 60 degrees from horizontal
CORRECT ANSWER: B. 53 degrees from horizontal
RATIONALE:OSHA standards (29 CFR 1926 Subpart P) specify that for Type A soil (the
most stable), the maximum allowable slope without a protective system is 53 degrees
from horizontal (or a ¾:1 slope). Type B soil allows 45 degrees, and Type C soil requires
34 degrees or protective systems.
Question 6: Which of the following is considered a "competent person" under
OSHA excavation standards?
A. Any worker who has completed an OSHA 10-hour course
B. A supervisor who can identify hazards and has authority to correct them
C. An engineer who designs protective systems for excavations
D. A safety consultant hired for periodic site inspections
CORRECT ANSWER: B. A supervisor who can identify hazards and has authority to
correct them
RATIONALE:OSHA defines a "competent person" as one who is capable of identifying
existing and predictable hazards in the surroundings or working conditions, and who
has authorization to take prompt corrective measures to eliminate them. This requires
both knowledge and authority, not just training or credentials.
,Question 7: When working near overhead power lines rated at 50 kV, what is the
minimum required clearance distance for equipment?
A. 6 feet
B. 10 feet
C. 15 feet
D. 20 feet
CORRECT ANSWER: B. 10 feet
RATIONALE:OSHA standard 1926.1408 specifies that for power lines rated up to 50 kV,
the minimum clearance distance is 10 feet. For voltages above 50 kV, an additional 0.4
inches per kV over 50 kV is required. Maintaining this distance prevents electrocution
and arc flash hazards.
Question 8: Which type of fall protection system is designed to stop a fall after it
has occurred?
A. Guardrail system
B. Safety net system
C. Personal fall arrest system
D. Warning line system
CORRECT ANSWER: C. Personal fall arrest system
RATIONALE:A personal fall arrest system (PFAS) is designed to safely stop a worker's
fall after it has begun, typically using a full-body harness, lanyard, and anchor point.
Guardrails and safety nets are fall prevention or passive protection systems, while
warning lines merely alert workers to hazards.
Question 9: What is the minimum load capacity that a scaffold platform must
support per square foot?
A. 25 pounds
B. 50 pounds
C. 75 pounds
D. 100 pounds
CORRECT ANSWER: B. 50 pounds
RATIONALE:OSHA standard 1926.451(a)(1) requires that scaffold platforms and their
components be capable of supporting, without failure, at least 4 times the maximum
intended load. For light-duty scaffolds, the minimum uniform load is 25 pounds per
square foot; however, the standard minimum design load is generally 50 pounds per
square foot for typical construction use.
Question 10: Which of the following ladder types is prohibited for electrical work?
A. Fiberglass ladder
B. Wooden ladder
, C. Aluminum ladder
D. Ladder with non-conductive rails
CORRECT ANSWER: C. Aluminum ladder
RATIONALE:Aluminum is a conductive material and poses a severe electrocution
hazard when used near energized electrical equipment. OSHA requires non-conductive
ladders (fiberglass or wood) for electrical work. Even wooden ladders can become
conductive if wet or contaminated, so fiberglass is preferred.
Question 11: What does the acronym "PPE" stand for in workplace safety?
A. Personal Protection Equipment
B. Primary Preventive Equipment
C. Personal Protective Equipment
D. Professional Protective Ensemble
CORRECT ANSWER: C. Personal Protective Equipment
RATIONALE:PPE stands for Personal Protective Equipment, which includes items such
as hard hats, safety glasses, gloves, and respirators designed to protect workers from
workplace hazards. OSHA requires employers to provide and ensure the use of
appropriate PPE when hazards cannot be eliminated through engineering or
administrative controls.
Question 12: Which class of fire involves flammable liquids such as gasoline, oil, or
paint?
A. Class A
B. Class B
C. Class C
D. Class D
CORRECT ANSWER: B. Class B
RATIONALE:Fire classifications are based on the fuel source. Class B fires involve
flammable or combustible liquids and gases. Class A involves ordinary combustibles
(wood, paper), Class C involves energized electrical equipment, and Class D involves
combustible metals. Using the correct fire extinguisher class is critical for effective and
safe fire suppression.
Question 13: What is the required minimum width for an exit route in a workplace?
A. 18 inches
B. 24 inches
C. 28 inches
D. 36 inches
CORRECT ANSWER: C. 28 inches
Verified Answers and Detailed Rationales | Workplace Hazard Identification, OSHA
Safety Standards and Regulations, Construction and General Industry Safety, Fall
Protection, Electrical Safety, Personal Protective Equipment (PPE), Hazard
Communication and Accident Prevention
Question 1: What is the primary purpose of the Occupational Safety and Health
Administration (OSHA)?
A. To provide health insurance coverage for construction workers
B. To ensure safe and healthful working conditions by setting and enforcing standards
C. To manage workers' compensation claims for workplace injuries
D. To certify contractors for federal construction projects
CORRECT ANSWER: B. To ensure safe and healthful working conditions by setting
and enforcing standards
RATIONALE:OSHA was created under the Occupational Safety and Health Act of 1970
with the mission to assure safe and healthful working conditions for workers by setting
and enforcing standards and by providing training, outreach, education, and assistance.
Options A, C, and D describe functions handled by other agencies or entities, not
OSHA's core mandate.
Question 2: Which of the following is NOT a right granted to workers under the OSH
Act?
A. The right to file a complaint with OSHA about workplace hazards
B. The right to receive information and training about workplace hazards
C. The right to refuse to work in any situation they find uncomfortable
D. The right to participate in an OSHA inspection of their workplace
CORRECT ANSWER: C. The right to refuse to work in any situation they find
uncomfortable
RATIONALE:While workers have the right to refuse work under specific, imminent
danger conditions as defined by OSHA, they do not have a blanket right to refuse work
simply because they find a situation uncomfortable. The other options are explicit rights
protected under Section 11(c) and other provisions of the OSH Act.
Question 3: An employer must report a work-related fatality to OSHA within how
many hours?
A. 4 hours
B. 8 hours
C. 24 hours
D. 48 hours
CORRECT ANSWER: B. 8 hours
,RATIONALE:OSHA regulations require employers to report any work-related fatality
within 8 hours of learning about the incident. In-patient hospitalizations, amputations,
or losses of an eye must be reported within 24 hours. This ensures timely investigation
and prevention of future incidents.
Question 4: Which color is typically used on safety signs to indicate caution and
potential hazards that could cause minor or moderate injury?
A. Red
B. Orange
C. Yellow
D. Green
CORRECT ANSWER: C. Yellow
RATIONALE:According to ANSI Z535 and OSHA guidelines, yellow is used for caution
signs to warn of potential hazards that could result in minor or moderate injury. Red
indicates danger or stop, orange warns of dangerous parts of machinery, and green
indicates safety equipment or first aid.
Question 5: What is the maximum allowable slope for an excavation in Type A soil
when no protective system is used?
A. 34 degrees from horizontal
B. 53 degrees from horizontal
C. 45 degrees from horizontal
D. 60 degrees from horizontal
CORRECT ANSWER: B. 53 degrees from horizontal
RATIONALE:OSHA standards (29 CFR 1926 Subpart P) specify that for Type A soil (the
most stable), the maximum allowable slope without a protective system is 53 degrees
from horizontal (or a ¾:1 slope). Type B soil allows 45 degrees, and Type C soil requires
34 degrees or protective systems.
Question 6: Which of the following is considered a "competent person" under
OSHA excavation standards?
A. Any worker who has completed an OSHA 10-hour course
B. A supervisor who can identify hazards and has authority to correct them
C. An engineer who designs protective systems for excavations
D. A safety consultant hired for periodic site inspections
CORRECT ANSWER: B. A supervisor who can identify hazards and has authority to
correct them
RATIONALE:OSHA defines a "competent person" as one who is capable of identifying
existing and predictable hazards in the surroundings or working conditions, and who
has authorization to take prompt corrective measures to eliminate them. This requires
both knowledge and authority, not just training or credentials.
,Question 7: When working near overhead power lines rated at 50 kV, what is the
minimum required clearance distance for equipment?
A. 6 feet
B. 10 feet
C. 15 feet
D. 20 feet
CORRECT ANSWER: B. 10 feet
RATIONALE:OSHA standard 1926.1408 specifies that for power lines rated up to 50 kV,
the minimum clearance distance is 10 feet. For voltages above 50 kV, an additional 0.4
inches per kV over 50 kV is required. Maintaining this distance prevents electrocution
and arc flash hazards.
Question 8: Which type of fall protection system is designed to stop a fall after it
has occurred?
A. Guardrail system
B. Safety net system
C. Personal fall arrest system
D. Warning line system
CORRECT ANSWER: C. Personal fall arrest system
RATIONALE:A personal fall arrest system (PFAS) is designed to safely stop a worker's
fall after it has begun, typically using a full-body harness, lanyard, and anchor point.
Guardrails and safety nets are fall prevention or passive protection systems, while
warning lines merely alert workers to hazards.
Question 9: What is the minimum load capacity that a scaffold platform must
support per square foot?
A. 25 pounds
B. 50 pounds
C. 75 pounds
D. 100 pounds
CORRECT ANSWER: B. 50 pounds
RATIONALE:OSHA standard 1926.451(a)(1) requires that scaffold platforms and their
components be capable of supporting, without failure, at least 4 times the maximum
intended load. For light-duty scaffolds, the minimum uniform load is 25 pounds per
square foot; however, the standard minimum design load is generally 50 pounds per
square foot for typical construction use.
Question 10: Which of the following ladder types is prohibited for electrical work?
A. Fiberglass ladder
B. Wooden ladder
, C. Aluminum ladder
D. Ladder with non-conductive rails
CORRECT ANSWER: C. Aluminum ladder
RATIONALE:Aluminum is a conductive material and poses a severe electrocution
hazard when used near energized electrical equipment. OSHA requires non-conductive
ladders (fiberglass or wood) for electrical work. Even wooden ladders can become
conductive if wet or contaminated, so fiberglass is preferred.
Question 11: What does the acronym "PPE" stand for in workplace safety?
A. Personal Protection Equipment
B. Primary Preventive Equipment
C. Personal Protective Equipment
D. Professional Protective Ensemble
CORRECT ANSWER: C. Personal Protective Equipment
RATIONALE:PPE stands for Personal Protective Equipment, which includes items such
as hard hats, safety glasses, gloves, and respirators designed to protect workers from
workplace hazards. OSHA requires employers to provide and ensure the use of
appropriate PPE when hazards cannot be eliminated through engineering or
administrative controls.
Question 12: Which class of fire involves flammable liquids such as gasoline, oil, or
paint?
A. Class A
B. Class B
C. Class C
D. Class D
CORRECT ANSWER: B. Class B
RATIONALE:Fire classifications are based on the fuel source. Class B fires involve
flammable or combustible liquids and gases. Class A involves ordinary combustibles
(wood, paper), Class C involves energized electrical equipment, and Class D involves
combustible metals. Using the correct fire extinguisher class is critical for effective and
safe fire suppression.
Question 13: What is the required minimum width for an exit route in a workplace?
A. 18 inches
B. 24 inches
C. 28 inches
D. 36 inches
CORRECT ANSWER: C. 28 inches
