Getting ready for the CHST requires a balanced approach that includes both study and practice. This test is designed to help you apply what you’ve learned in a practical way. Instead of passively reading material, you’ll actively engage with questions that challenge your understanding. This not only improves retention but also prepares you for the type of thinking required during the actual exam. Make sure to review each answer carefully to maximize your learning.
Updated for 2026: This guide provides a structured approach to help you prepare effectively, understand key concepts, and practice real exam-level questions.
How to Use This Practice Test
- Start by reviewing key concepts before attempting questions
- Take the test in a timed environment
- Analyze your mistakes and revisit weak areas
Why This Practice Test Matters
This practice test is designed to simulate the real exam environment and help you identify knowledge gaps, improve accuracy, and build confidence.
| Exam Name | Construction Health and Safety Technician (CHST) Practice Exam – 2026 Updated |
|---|---|
| Exam Provider | Board of Certified Safety Professionals (BCSP) |
| Certification Type | Professional Safety Certification (Construction Safety & Risk Management) |
| Total Practice Questions | 120 Advanced MCQs (Scenario-Based + Calculation + OSHA Trap Questions) |
| Exam Domains Covered | • Hazard Identification & Risk Assessment • OSHA Regulations & Compliance • Fall Protection & Scaffolding Safety • Excavation & Trenching Safety • Electrical & Lockout/Tagout (LOTO) • Confined Space Entry & Atmospheric Hazards • Fire Protection & Emergency Response • Ergonomics & Occupational Health |
| Questions in Real Exam | • Total: ~200 Questions • Mix of knowledge-based and scenario-driven questions • Strong emphasis on OSHA standards and field decisions |
| Exam Duration | • Total Time: ~4 Hours • Time-intensive with real-world scenarios • Requires strong decision-making speed |
| Passing Score | • Scaled scoring system (typically ~60–70%) • Performance-based evaluation across domains |
| Question Format | • Multiple Choice Questions (MCQs) • Scenario-Based Safety Problems • Calculation Questions (TRIR, ladder ratios, load limits) • OSHA Regulation Interpretation |
| Difficulty Level | Intermediate to Advanced (Field-Based & OSHA Focused) |
| Key Calculation Areas | • TRIR (Total Recordable Incident Rate) • Ladder Setup (4:1 Ratio) • Scaffold Load Capacity (4× Rule) • Noise Exposure Limits (dB calculations) • Fall Distance & Clearance Calculations |
| Common Exam Traps | • Confusing 6 ft vs 10 ft fall protection rules • Miscalculating TRIR formula • Incorrect ladder angle calculations • Ignoring soil types in trench safety • Misinterpreting OSHA thresholds (noise, exposure) • Overlooking real-world hazard priorities |
| Skills Developed | • Hazard recognition and control • OSHA compliance and interpretation • Incident analysis and prevention • Construction site safety management • Risk-based decision making • Emergency response planning |
| Study Strategy | • Focus on OSHA standards and real scenarios • Practice calculation-based questions regularly • Learn hierarchy of controls clearly • Review common accident causes (falls, struck-by, etc.) • Take full-length timed mock exams • Analyze mistakes deeply to improve accuracy |
| Best For | • Construction safety professionals • Site supervisors and foremen • Safety coordinators and inspectors • Individuals pursuing CHST certification |
| Career Benefits | • Industry-recognized safety certification • Increased job opportunities in construction safety • Higher earning potential • Strong credibility in OSHA compliance roles |
| Updated | 2026 Latest Version – Based on Current OSHA Standards |
1.
A worker is exposed to fall hazards at 8 feet. What is required?
A. No protection
B. Fall protection system
C. PPE only
D. Warning signs
Answer: B
Rationale:
OSHA requires fall protection at heights of 6 feet or more in construction. Systems include guardrails, safety nets, or personal fall arrest systems.
2.
What is the primary purpose of a Job Hazard Analysis (JHA)?
A. Increase productivity
B. Identify hazards and controls
C. Reduce cost
D. Train supervisors
Answer: B
Rationale:
JHA breaks down tasks to identify hazards and implement controls, improving workplace safety proactively.
3.
Which OSHA standard covers excavation safety?
A. 1926 Subpart P
B. 1910 Subpart D
C. 1926 Subpart L
D. 1910 Subpart S
Answer: A
Rationale:
Subpart P addresses excavation and trenching safety requirements.
4.
What is the minimum safe distance from overhead power lines (≤50 kV)?
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
Answer: B
Rationale:
OSHA requires at least 10 feet clearance from power lines up to 50 kV.
5.
What type of control eliminates hazards at the source?
A. PPE
B. Administrative control
C. Engineering control
D. Substitution
Answer: C
Rationale:
Engineering controls physically remove or isolate hazards, making them most effective.
6.
A trench deeper than 5 feet requires what?
A. Warning signs
B. Protective system
C. PPE only
D. Training only
Answer: B
Rationale:
Protective systems like sloping, shoring, or shielding are required for trenches ≥5 feet.
7.
What is the purpose of lockout/tagout?
A. Increase efficiency
B. Prevent equipment startup
C. Improve maintenance
D. Reduce cost
Answer: B
Rationale:
LOTO prevents accidental energization during maintenance.
8.
Which PPE protects against head injury?
A. Gloves
B. Hard hat
C. Goggles
D. Boots
Answer: B
Rationale:
Hard hats protect against falling objects and impact hazards.
9.
What is the leading cause of construction fatalities?
A. Electrical
B. Falls
C. Struck-by
D. Caught-in
Answer: B
Rationale:
Falls are consistently the leading cause of fatalities in construction.
10.
What is the purpose of a safety audit?
A. Increase cost
B. Identify compliance gaps
C. Reduce staff
D. Improve design
Answer: B
Rationale:
Audits evaluate safety programs and identify areas for improvement.
11.
Which hazard is associated with silica dust?
A. Burns
B. Respiratory disease
C. Noise
D. Heat stress
Answer: B
Rationale:
Silica exposure can cause silicosis and lung disease.
12.
What is a confined space?
A. Open area
B. Limited entry and exit
C. Outdoor area
D. High noise area
Answer: B
Rationale:
Confined spaces have limited entry/exit and may pose hazards.
13.
Which fire class involves flammable liquids?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: B
Rationale:
Class B fires involve flammable liquids like gasoline.
14.
What is the purpose of guardrails?
A. Improve design
B. Prevent falls
C. Reduce cost
D. Increase speed
Answer: B
Rationale:
Guardrails are passive fall protection systems.
15.
What is the safe ladder angle?
A. 1:2
B. 1:3
C. 1:4
D. 1:5
Answer: C
Rationale:
Ladder should be placed at a 4:1 ratio (1 ft out for every 4 ft up).
16.
Which hazard is related to repetitive motion?
A. Acute injury
B. Ergonomic injury
C. Chemical exposure
D. Electrical hazard
Answer: B
Rationale:
Repetitive motion leads to musculoskeletal disorders.
17.
What is the purpose of PPE?
A. Eliminate hazard
B. Protect worker
C. Increase cost
D. Improve efficiency
Answer: B
Rationale:
PPE reduces exposure but does not eliminate hazards.
18.
Which equipment is used for fall arrest?
A. Guardrail
B. Harness
C. Ladder
D. Scaffold
Answer: B
Rationale:
Personal fall arrest systems include harnesses and lanyards.
19.
What is heat stress caused by?
A. Cold weather
B. High temperature
C. Noise
D. Vibration
Answer: B
Rationale:
Heat stress occurs due to excessive heat exposure.
20.
What is the purpose of safety training?
A. Increase cost
B. Improve awareness
C. Reduce production
D. Increase hazards
Answer: B
Rationale:
Training ensures workers understand risks and safe practices.
21.
Which hazard involves falling objects?
A. Electrical
B. Struck-by
C. Caught-in
D. Slip
Answer: B
Rationale:
Struck-by hazards include falling tools or materials.
22.
What is scaffolding used for?
A. Storage
B. Elevated work platform
C. Transport
D. Excavation
Answer: B
Rationale:
Scaffolds provide safe access to elevated work areas.
23.
Which control is least effective?
A. Elimination
B. Engineering
C. Administrative
D. PPE
Answer: D
Rationale:
PPE is last line of defense in hierarchy of controls.
24.
What is noise hazard threshold?
A. 70 dB
B. 85 dB
C. 100 dB
D. 120 dB
Answer: B
Rationale:
85 dB is OSHA threshold for hearing conservation.
25.
What is a near miss?
A. Injury
B. Incident without injury
C. Fatality
D. Equipment failure
Answer: B
Rationale:
Near misses are warning signs for potential accidents.
26.
Which hazard involves being caught in machinery?
A. Struck-by
B. Caught-in
C. Electrical
D. Slip
Answer: B
Rationale:
Caught-in hazards involve entanglement or crushing.
27.
What is the purpose of a safety meeting?
A. Increase cost
B. Communicate hazards
C. Reduce staff
D. Improve design
Answer: B
Rationale:
Safety meetings reinforce awareness and communication.
28.
What is the main goal of incident investigation?
A. Assign blame
B. Identify root cause
C. Increase cost
D. Reduce staff
Answer: B
Rationale:
Focus is on prevention, not blame.
29.
Which hazard involves slippery surfaces?
A. Electrical
B. Slip/trip
C. Chemical
D. Noise
Answer: B
Rationale:
Slips and trips are common workplace hazards.
30.
What is the purpose of safety signage?
A. Decoration
B. Hazard communication
C. Increase cost
D. Improve design
Answer: B
Rationale:
Signs provide warnings and instructions to prevent accidents.
31.
A worker is on a scaffold 12 feet high without fall protection. What is the violation?
A. None
B. Fall protection required above 10 ft
C. Fall protection required above 6 ft
D. Only training required
Answer:B
Rationale:
For scaffolds, OSHA requires fall protection at heights above 10 feet, not 6 feet (trap—6 ft applies to general construction).
32.
A ladder is placed 8 feet high. What is the base distance from the wall?
A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft
Answer: B
Rationale:
4:1 ratio → 8 ÷ 4 = 2 ft.
Trap: Many use incorrect ratios.
33.
A trench is 6 feet deep in Type C soil. What protection is required?
A. None
B. Sloping or shielding
C. PPE only
D. Training only
Answer: B
Rationale:
Type C soil is least stable—requires protective systems.
34.
A worker is exposed to 95 dB noise for 8 hours. What is required?
A. No action
B. Hearing protection program
C. Only signage
D. PPE optional
Answer: B
Rationale:
OSHA requires hearing conservation at ≥85 dB. At 95 dB, controls and PPE are mandatory.
35.
A crane lifts a load near power lines (13 kV). Minimum clearance?
A. 5 ft
B. 10 ft
C. 15 ft
D. 20 ft
Answer: B
Rationale:
Minimum 10 ft clearance for ≤50 kV.
36.
A worker falls from 20 ft but survives. What type of incident?
A. Near miss
B. First aid
C. Recordable injury
D. Fatality
Answer: C
Rationale:
Any significant injury requiring treatment beyond first aid is recordable.
37.
A scaffold supports 4 workers and materials totaling 2,000 lbs. Required capacity?
A. 2,000 lbs
B. 3,000 lbs
C. 8,000 lbs
D. 4,000 lbs
Answer: C
Rationale:
Scaffolds must support 4× intended load → 2,000 × 4 = 8,000 lbs.
38.
A worker enters a confined space without testing atmosphere. What is violated?
A. DOT
B. OSHA confined space standard
C. EPA
D. None
Answer: B
Rationale:
Atmospheric testing is mandatory before entry.
39.
A fall arrest system must limit force to?
A. 900 lbs
B. 1,200 lbs
C. 1,800 lbs
D. 2,000 lbs
Answer: C
Rationale:
Maximum arresting force is 1,800 lbs for body harness.
40.
A site has 120 employees and 6 recordable injuries. Incident rate?
A. 5.0
B. 10.0
C. 12.0
D. 15.0
Answer: B
Rationale:
IR = (6 × 200,000) / (120 × 2000) = 10
Trap: Wrong formula usage.
41.
A worker is exposed to silica dust. What control is most effective?
A. PPE
B. Administrative
C. Engineering control
D. Training
Answer: C
Rationale:
Engineering controls like wet cutting reduce exposure at source.
42.
A forklift carries load exceeding rated capacity. What risk?
A. None
B. Tip-over hazard
C. Reduced efficiency
D. Cost increase
Answer: B
Rationale:
Overloading compromises stability.
43.
A ladder extends only 2 feet above landing. What issue?
A. No issue
B. OSHA requires 3 feet
C. OSHA requires 4 feet
D. Training issue
Answer: B
Rationale:
Ladders must extend at least 3 feet above landing.
44.
A worker is struck by falling tools. What hazard category?
A. Electrical
B. Struck-by
C. Caught-in
D. Slip
Answer: B
45.
A worker works 10 hrs/day in heat. What risk increases?
A. Cold stress
B. Heat stress
C. Noise
D. Vibration
Answer: B
46.
A trench is 4 feet deep. Is protection required?
A. Yes always
B. Only if hazardous conditions exist
C. No
D. Only PPE
Answer: B
Rationale:
<5 ft trenches require protection if hazards exist.
47.
A crane load swings unexpectedly. What is primary cause?
A. Weather
B. Improper rigging
C. PPE
D. Training
Answer: B
48.
A worker receives electric shock from exposed wire. What control failed?
A. PPE
B. Engineering control
C. Administrative
D. Training
Answer: B
Rationale:
Proper insulation/guarding is engineering control.
49.
A safety factor for rigging equipment is typically?
A. 2:1
B. 3:1
C. 5:1
D. 10:1
Answer: C
50.
A scaffold lacks guardrails at 15 ft. What is required?
A. Nothing
B. Guardrails or fall arrest
C. PPE only
D. Training
Answer: B
51.
A worker slips on wet floor. What control is best?
A. PPE
B. Housekeeping
C. Training
D. Signage only
Answer: B
52.
A confined space has oxygen at 18%. What condition?
A. Safe
B. Oxygen deficient
C. Toxic
D. Flammable
Answer: B
Rationale:
Safe range is 19.5–23.5%.
53.
A site records 4 injuries, 80 workers. Incident rate?
A. 5
B. 10
C. 12.5
D. 8
Answer: A
Rationale:
(4×200,000)/(80×2000)=5
54.
A crane operator cannot see load. What is required?
A. Stop work
B. Signal person
C. PPE
D. Training
Answer: B
55.
A worker is exposed to chemical splash. Best PPE?
A. Hard hat
B. Gloves
C. Face shield
D. Boots
Answer: C
56.
A site lacks emergency exits. What violation?
A. OSHA
B. DOT
C. EPA
D. None
Answer: A
57.
A worker bypasses machine guard. What hazard?
A. Electrical
B. Caught-in
C. Slip
D. Noise
Answer: B
58.
A fire involves electrical equipment. What class?
A. A
B. B
C. C
D. D
Answer: C
59.
A worker lifts improperly and gets injured. What hazard?
A. Chemical
B. Ergonomic
C. Electrical
D. Fire
Answer: B
60.
A site has poor lighting. What risk increases?
A. Noise
B. Slips/trips
C. Chemical
D. Heat
Answer: B
61.
A project has 200 workers, 8 recordable injuries, and 400,000 hours worked. What is the TRIR?
A. 4.0
B. 3.0
C. 2.5
D. 5.0
Answer: A
Rationale:
TRIR = (Recordables × 200,000) / Total hours worked. Here: (8 × 200,000) / 400,000 = 4.0. Many candidates mistakenly divide by number of employees instead of total hours worked. OSHA uses standardized 200,000 hours (100 workers × 40 hrs × 50 weeks) to normalize incident rates.
62.
A scaffold is loaded to 3,000 lbs. What minimum capacity must it support?
A. 3,000 lbs
B. 6,000 lbs
C. 9,000 lbs
D. 12,000 lbs
Answer: D
Rationale:
OSHA requires scaffolds to support at least four times the intended load. Therefore, 3,000 × 4 = 12,000 lbs. This safety factor ensures structural integrity under dynamic conditions such as worker movement and material shifts, which can increase actual load stress beyond static calculations.
63.
A worker is exposed to 100 dB for 2 hours. What is required?
A. No action
B. Hearing conservation program
C. PPE optional
D. Administrative control only
Answer: B
Rationale:
OSHA requires hearing protection when exposure exceeds 85 dB over an 8-hour TWA. At 100 dB, permissible exposure time is drastically reduced (approx. 2 hours). This exposure exceeds limits, requiring inclusion in a hearing conservation program, including monitoring, PPE, and training.
64.
A ladder reaches 16 ft height. What is base distance?
A. 2 ft
B. 3 ft
C. 4 ft
D. 5 ft
Answer: C
Rationale:
Using the 4:1 rule, base distance = height ÷ 4 → 16 ÷ 4 = 4 ft. This ensures ladder stability and prevents tipping. A common mistake is using incorrect ratios or failing to apply the rule to vertical height instead of ladder length.
65.
A trench in Type B soil is 10 ft deep. What is required?
A. No protection
B. Sloping, shoring, or shielding
C. PPE only
D. Warning signs
Answer: B
Rationale:
Any trench ≥5 ft requires protective systems unless entirely stable rock. Type B soil is moderately unstable, requiring engineered solutions like sloping or trench boxes. Depth increases collapse risk exponentially, making protective systems critical.
66.
A fall arrest system must limit free fall distance to?
A. 4 ft
B. 6 ft
C. 8 ft
D. 10 ft
Answer: B
Rationale:
OSHA requires personal fall arrest systems to limit free fall distance to 6 feet or less. This minimizes impact force and injury risk. Exceeding this distance increases arresting force beyond safe limits, even if harness is used.
67.
A worker is exposed to 18% oxygen in confined space. What is condition?
A. Safe
B. Oxygen deficient
C. Toxic
D. Flammable
Answer: B
Rationale:
Normal oxygen range is 19.5–23.5%. At 18%, the atmosphere is oxygen deficient, posing serious risks like dizziness or unconsciousness. OSHA requires testing and ventilation before entry to prevent asphyxiation hazards.
68.
A crane lifts load beyond rated capacity. What is most likely failure?
A. Electrical
B. Structural collapse
C. Fire
D. Noise
Answer: B
Rationale:
Overloading compromises crane structural integrity, potentially leading to boom failure or tip-over. Load charts must be strictly followed, considering radius, angle, and dynamic forces. Exceeding capacity is a major cause of crane accidents.
69.
A site has 3 injuries and 150,000 hours worked. TRIR?
A. 4.0
B. 3.5
C. 2.0
D. 6.0
Answer: A
Rationale:
TRIR = (3 × 200,000) / 150,000 = 4.0. Many candidates miscalculate by using employee count instead of hours worked. This formula standardizes injury rates across companies of different sizes.
70.
A worker bypasses machine guard. What hazard increases?
A. Slip
B. Caught-in
C. Noise
D. Heat
Answer: B
Rationale:
Machine guards prevent contact with moving parts. Removing them exposes workers to caught-in or entanglement hazards, which can cause severe injuries like amputations.
71.
A confined space contains flammable gas above LEL. What risk?
A. Toxicity
B. Explosion
C. Oxygen deficiency
D. Noise
Answer: B
Rationale:
If gas concentration exceeds Lower Explosive Limit (LEL), ignition can cause explosion. Monitoring LEL levels is critical before entry and during work.
72.
A worker is exposed to 90 dB for 8 hours. What is required?
A. No action
B. Hearing protection
C. Training only
D. PPE optional
Answer: B
Rationale:
90 dB exceeds OSHA threshold (85 dB), requiring hearing protection and monitoring.
73.
A scaffold is missing toe boards. What hazard increases?
A. Electrical
B. Falling object
C. Slip
D. Heat
Answer: B
Rationale:
Toe boards prevent tools/materials from falling, reducing struck-by hazards.
74.
A worker handles chemicals without SDS access. What violation?
A. DOT
B. OSHA hazard communication
C. EPA
D. None
Answer: B
75.
A fall from 25 ft occurs. What is priority action?
A. Report later
B. Emergency response
C. Resume work
D. Training
Answer: B
76.
A site has poor housekeeping. What risk increases?
A. Noise
B. Slip/trip
C. Electrical
D. Heat
Answer: B
77.
A crane operates in high wind. What risk increases?
A. Fire
B. Load instability
C. Noise
D. Heat
Answer: B
78.
A worker is exposed to vibration tools daily. What hazard?
A. Chemical
B. Ergonomic
C. Electrical
D. Fire
Answer: B
79.
A ladder is placed on uneven surface. What risk?
A. Electrical
B. Tip-over
C. Noise
D. Heat
Answer: B
80.
A trench lacks inspection after rain. What risk?
A. None
B. Collapse
C. Fire
D. Noise
Answer: B
81.
A worker uses damaged PPE. What issue?
A. No issue
B. Reduced protection
C. Efficiency
D. Cost saving
Answer: B
82.
A confined space lacks attendant. What violation?
A. DOT
B. OSHA
C. EPA
D. None
Answer: B
83.
A worker is struck by moving vehicle. What hazard?
A. Electrical
B. Struck-by
C. Slip
D. Chemical
Answer: B
84.
A site lacks fire extinguisher near flammable area. What risk?
A. None
B. Fire spread
C. Noise
D. Heat
Answer: B
85.
A worker is exposed to 110 dB briefly. What is required?
A. No action
B. Immediate hearing protection
C. Training only
D. PPE optional
Answer: B
86.
A scaffold platform has gaps. What hazard?
A. Electrical
B. Fall
C. Noise
D. Heat
Answer: B
87.
A worker enters excavation without access ladder. What violation?
A. DOT
B. OSHA
C. EPA
D. None
Answer: B
88.
A site lacks safety signage. What risk?
A. None
B. Miscommunication
C. Efficiency
D. Cost saving
Answer: B
89.
A worker is fatigued after long shift. What risk increases?
A. Noise
B. Human error
C. Heat
D. Electrical
Answer: B
90.
A machine lacks emergency stop. What risk?
A. None
B. Delayed shutdown
C. Noise
D. Heat
Answer: B
91.
A project logs 10 recordable injuries over 500,000 hours worked. What is the TRIR?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
Answer: C
Rationale:
TRIR = (10 × 200,000) / 500,000 = 4.0. The key trap is using employee count instead of hours worked. OSHA standardizes incident rates using 200,000 hours to reflect 100 full-time workers annually, allowing comparison across projects of different sizes.
92.
A ladder is set to reach 20 ft height. What is base distance?
A. 4 ft
B. 5 ft
C. 6 ft
D. 3 ft
Answer: B
Rationale:
Using the 4:1 rule, base distance = height ÷ 4 → 20 ÷ 4 = 5 ft. This ratio ensures ladder stability. A common mistake is measuring along ladder length instead of vertical height, which leads to unsafe setup angles.
93.
A scaffold is designed for 2,500 lbs. What minimum capacity must it support?
A. 2,500 lbs
B. 5,000 lbs
C. 7,500 lbs
D. 10,000 lbs
Answer: D
Rationale:
OSHA requires scaffolds to support four times the intended load. Therefore, 2,500 × 4 = 10,000 lbs. This accounts for dynamic loads and ensures structural safety. Many candidates forget the 4× factor and select the original load value.
94.
A worker is exposed to 85 dB for 8 hours. What is required?
A. No action
B. Hearing conservation program
C. PPE optional
D. Training only
Answer: B
Rationale:
85 dB is the OSHA action level for hearing conservation programs. This requires monitoring, audiometric testing, and hearing protection availability. Many confuse this with the 90 dB permissible exposure limit, but action begins earlier at 85 dB.
95.
A trench is 12 ft deep in Type C soil. What protection is required?
A. None
B. Sloping only
C. Protective system (engineered)
D. PPE only
Answer: C
Rationale:
Deep trenches in unstable Type C soil require engineered protective systems such as trench boxes or shoring. Sloping alone may not be sufficient due to soil instability and depth. OSHA emphasizes engineered solutions for high-risk excavations.
96.
A fall arrest system allows 8 ft free fall. What issue?
A. No issue
B. Exceeds OSHA limit
C. Safe condition
D. Training issue
Answer: B
Rationale:
OSHA limits free fall distance to 6 feet. An 8-foot fall increases arresting force and injury risk. Even with a harness, excessive free fall can result in severe injuries, making this a compliance violation.
97.
A confined space has oxygen at 23.8%. What condition?
A. Safe
B. Oxygen deficient
C. Oxygen enriched
D. Toxic
Answer: C
Rationale:
Oxygen levels above 23.5% are considered enriched and increase fire risk. Materials ignite more easily and burn more intensely. Many assume higher oxygen is safer, but it actually creates hazardous conditions.
98.
A crane lifts load at maximum radius. What risk increases?
A. Electrical
B. Reduced lifting capacity
C. Noise
D. Heat
Answer: B
Rationale:
As boom radius increases, lifting capacity decreases due to leverage effects. This is a common exam trap—operators must follow load charts carefully. Ignoring radius can lead to overload and tip-over incidents.
99.
A worker slips due to oil spill. What control failed?
A. PPE
B. Engineering
C. Housekeeping
D. Administrative
Answer: C
Rationale:
Housekeeping is critical for preventing slip hazards. Oil spills should be cleaned immediately. Poor housekeeping is one of the most common causes of workplace injuries and is often overlooked as a basic safety control.
100.
A worker exposed to 105 dB for 1 hour. What is required?
A. No action
B. Hearing protection mandatory
C. Training only
D. PPE optional
Answer: B
Rationale:
At 105 dB, allowable exposure is less than 1 hour. This exceeds OSHA limits, requiring immediate hearing protection and exposure control. Noise exposure risk increases exponentially with intensity.
101.
A scaffold lacks mid-rails. What hazard increases?
A. Electrical
B. Fall risk
C. Noise
D. Heat
Answer: B
Rationale:
Mid-rails are part of guardrail systems that prevent falls. Without them, workers can slip through openings. OSHA requires top rail, mid-rail, and toe board for full protection.
102.
A worker bypasses lockout/tagout. What risk increases?
A. Slip
B. Unexpected energization
C. Noise
D. Heat
Answer: B
Rationale:
LOTO prevents accidental startup of equipment. Bypassing it exposes workers to serious hazards such as electrocution or mechanical injury from unexpected machine movement.
103.
A confined space contains 12% LEL gas. What condition?
A. Safe
B. Explosion risk
C. Oxygen deficiency
D. Toxic only
Answer: B
Rationale:
Gas levels above 10% LEL are considered hazardous and can lead to explosion if ignition occurs. Continuous monitoring is required in confined spaces.
104.
A worker lifts heavy load incorrectly. What injury risk?
A. Chemical
B. Ergonomic
C. Electrical
D. Fire
Answer: B
Rationale:
Improper lifting leads to musculoskeletal injuries. Ergonomic hazards are a major cause of lost workdays and require proper training and mechanical aids.
105.
A trench lacks daily inspection. What risk increases?
A. Fire
B. Collapse
C. Noise
D. Heat
Answer: B
Rationale:
Daily inspections are required to identify hazards like soil movement or water accumulation. Failure increases collapse risk, which is often fatal.
106.
A worker stands under suspended load. What hazard?
A. Electrical
B. Struck-by
C. Slip
D. Heat
Answer: B
Rationale:
Suspended loads can fall due to rigging failure or equipment malfunction, creating severe struck-by hazards.
107.
A machine lacks guard. What hazard increases?
A. Slip
B. Caught-in
C. Noise
D. Heat
Answer: B
Rationale:
Machine guards prevent contact with moving parts. Without them, workers risk entanglement or crushing injuries.
108.
A site lacks emergency evacuation plan. What risk?
A. None
B. Delayed response
C. Efficiency
D. Cost saving
Answer: B
Rationale:
Emergency plans ensure quick response during incidents. Without them, confusion and delays can increase injury severity.
109.
A worker exposed to chemicals without ventilation. What control failed?
A. PPE
B. Engineering control
C. Administrative
D. Training
Answer: B
Rationale:
Ventilation is an engineering control that removes contaminants at the source. Lack of it increases exposure risk.
110.
A ladder is damaged but still used. What risk?
A. None
B. Structural failure
C. Noise
D. Heat
Answer: B
Rationale:
Damaged ladders can collapse under load, leading to falls. OSHA requires inspection before use.
111.
A worker fatigued after 12-hour shift. What risk increases?
A. Noise
B. Human error
C. Heat
D. Electrical
Answer: B
Rationale:
Fatigue reduces alertness and increases likelihood of mistakes, a major factor in accidents.
112.
A crane operates on uneven ground. What risk?
A. Fire
B. Tip-over
C. Noise
D. Heat
Answer: B
Rationale:
Uneven ground affects stability, increasing risk of tipping.
113.
A confined space lacks ventilation. What hazard increases?
A. Noise
B. Toxic gas buildup
C. Heat
D. Electrical
Answer: B
Rationale:
Poor ventilation allows accumulation of hazardous gases, leading to suffocation or poisoning.
114.
A worker uses wrong PPE for chemical splash. What risk?
A. None
B. Exposure injury
C. Noise
D. Heat
Answer: B
Rationale:
Incorrect PPE fails to protect against hazards, increasing injury risk.
115.
A scaffold plank is cracked. What issue?
A. No issue
B. Structural failure risk
C. Efficiency
D. Cost saving
Answer: B
Rationale:
Damaged planks can break under load, causing falls.
116.
A site lacks fire extinguisher. What risk?
A. None
B. Fire escalation
C. Noise
D. Heat
Answer: B
Rationale:
Immediate fire suppression is critical to prevent spread.
117.
A worker is struck by moving equipment. What hazard?
A. Electrical
B. Struck-by
C. Slip
D. Chemical
Answer: B
118.
A trench has water accumulation. What risk?
A. None
B. Collapse
C. Noise
D. Heat
Answer: B
Rationale:
Water weakens soil structure, increasing collapse risk.
119.
A machine lacks emergency stop. What issue?
A. None
B. Delayed shutdown
C. Noise
D. Heat
Answer: B
120.
A site lacks training records. What issue?
A. None
B. OSHA compliance violation
C. Efficiency
D. Cost saving
Answer: B
Rationale:
Training documentation is required to demonstrate compliance. Lack of records can result in penalties even if training occurred.
Frequently Asked Questions
Is this CHST practice test similar to the real exam?
Yes, this practice test is designed to reflect real exam patterns, structure, and difficulty level to help you prepare effectively.
How can I study effectively with this CHST practice test?
Take the test in a timed setting, review your answers carefully, and focus on improving weak areas after each attempt.
Is it helpful to repeat this CHST practice test?
Yes, repeating the test helps reinforce concepts, improve accuracy, and build confidence for the actual exam.
Who should use this CHST practice test?
This practice test is suitable for both beginners and retakers who want to improve their understanding and performance.