A supervisor is preparing a job hazard analysis for setting precast panels. What is the correct order of steps?

Break the job into steps, identify each step's hazards, then set controls

Identify the controls, list the hazards, then break the job into steps

Write the procedure, train the crew, then identify the hazards of the job

List hazards for the whole site, assign PPE to each worker, then start work

A tornado warning is issued for a site with a partially enclosed concrete building. What is the BEST protective action?

Shelter in place in an interior, windowless area on the lowest floor

Evacuate all workers to their vehicles and drive away from the storm

Gather everyone at the outdoor assembly area for a headcount

Move workers to the upper floor of the concrete structure

Which job should receive priority for a job hazard analysis?

A new task near energized lines with potential for fatal injury

A routine, well-practiced task with no injury history on the site

Office filing and document handling in the site trailer

A simple task done daily by a single experienced worker

Why is PPE considered the LEAST effective level of the hierarchy of controls?

It leaves the hazard in place and depends on each worker's correct use

It is not covered by any OSHA standard in construction

It protects only against acute hazards, not chronic ones

It works only for short tasks lasting under one hour

Why is noise-induced hearing loss often not noticed until it is advanced?

It develops gradually and painlessly, starting near 4,000 Hz

It causes ear pain early, which workers learn to ignore

It begins at low frequencies that do not affect speech

It reverses overnight, so early shifts are not noticed

When should employees be trained on the emergency action plan?

When the plan is developed, at assignment, and when duties or the plan change

Only after the first emergency or drill shows a gap in the plan

At hire, then once every five years at the plan audit

At hire for supervisors; others follow their supervisor's direction

STSC

Free STSC Practice Questions

10 sample questions for the STSC, with the correct answer and an explanation for each. No account needed. Try each one before you open the answer.

Sections covered on the exam: Safety Program Implementation, The Code of Federal Regulations, Safety Management Systems, Occupational Health and Safety, Recordable Incidents, Root Cause Analysis, Safety Data Sheets, Job Hazard Analysis and Inspections, Hot Work, Electricity, Flammable Atmospheres, Confined Spaces, Lockout/Tagout, Hierarchy of Controls, Fall Protection and Working At Heights, Excavation and Trenching, Cranes, Rigging, and Heavy Equipment, Ergonomics, Thermal Stress, Noise Exposure, Chemical Exposure, Organ Toxicity, Fire Extinguishers, Chemical Storage, Emergency Response Plans, First Aid, Diversity, Bias, Integrity, Bcsp Code of Ethics.

Question 1 · Safety Program Implementation
A citation reads 29 CFR 1926.652(a)(1). Which part of this citation identifies the subject matter as construction?
- A.29
- B.1926
- C..652
- D.(a)(1)
Show answer and explanation
Answer: B. 1926
Title 29 covers Labor, Part 1926 is the OSHA construction standard, section .652 is the excavation protective-system requirement within Subpart P, and (a)(1) is a paragraph. The part number, 1926, is what identifies the rule as a construction standard.
Question 2 · Job Hazard Analysis and Inspections
A supervisor is preparing a job hazard analysis for setting precast panels. What is the correct order of steps?
- A.Identify the controls, list the hazards, then break the job into steps
- B.Write the procedure, train the crew, then identify the hazards of the job
- C.List hazards for the whole site, assign PPE to each worker, then start work
- D.Break the job into steps, identify each step's hazards, then set controls
Show answer and explanation
Answer: D. Break the job into steps, identify each step's hazards, then set controls
A JHA first breaks the job into its sequence of basic steps, then identifies the hazards associated with each step, and then assigns controls to each hazard using the hierarchy of controls. The JHA is then reviewed with the crew before work starts.
Question 3 · Hierarchy of Controls
A contractor redesigns a roof so that HVAC units are installed at ground level and lifted into place as a finished assembly, so workers do not work at the roof edge. Which level of the hierarchy is this?
- A.Substitution
- B.Elimination
- C.Administrative control
- D.PPE
Show answer and explanation
Answer: B. Elimination
Removing the need to work at height removes the fall hazard for that task, which is elimination, the most effective level of the hierarchy. Substitution replaces a hazard with a less hazardous one, and administrative controls change how work is done.
Question 4 · Noise Exposure
According to OSHA's 5-dB exchange rate, how long may a worker be exposed to 100 dBA without exceeding the PEL?
- A.8 hours
- B.4 hours
- C.2 hours
- D.1 hour
Show answer and explanation
Answer: C. 2 hours
The PEL is 90 dBA for 8 hours, and allowable time halves for each 5- dB increase: 95 dBA for 4 hours, 100 dBA for 2 hours, 105 dBA for 1 hour.
Question 5 · Emergency Response Plans
A tornado warning is issued for a site with a partially enclosed concrete building. What is the BEST protective action?
- A.Evacuate all workers to their vehicles and drive away from the storm
- B.Gather everyone at the outdoor assembly area for a headcount
- C.Move workers to the upper floor of the concrete structure
- D.Shelter in place in an interior, windowless area on the lowest floor
Show answer and explanation
Answer: D. Shelter in place in an interior, windowless area on the lowest floor
Tornadoes call for shelter-in-place in an interior room or hallway on the lowest level, away from windows. Vehicles, open assembly areas, and upper floors offer little protection from wind-borne debris.
Question 6 · Safety Program Implementation
Which subpart of 29 CFR 1926 contains the requirements for excavations, including protective systems and competent-person inspections?
- A.Subpart L
- B.Subpart M
- C.Subpart P
- D.Subpart X
Show answer and explanation
Answer: C. Subpart P
Subpart P covers excavations. Subpart L covers scaffolds, Subpart M covers fall protection, and Subpart X covers stairways and ladders.
Question 7 · Job Hazard Analysis and Inspections
Which job should receive priority for a job hazard analysis?
- A.A routine, well-practiced task with no injury history on the site
- B.Office filing and document handling in the site trailer
- C.A new task near energized lines with potential for fatal injury
- D.A simple task done daily by a single experienced worker
Show answer and explanation
Answer: C. A new task near energized lines with potential for fatal injury
Priority goes to jobs with high injury rates, potential for severe or fatal injury, new or changed jobs, and complex or infrequent tasks. Work near energized lines combines high severity with new conditions.
Question 8 · Hierarchy of Controls
Why is PPE considered the LEAST effective level of the hierarchy of controls?
- A.It is not covered by any OSHA standard in construction
- B.It leaves the hazard in place and depends on each worker's correct use
- C.It protects only against acute hazards, not chronic ones
- D.It works only for short tasks lasting under one hour
Show answer and explanation
Answer: B. It leaves the hazard in place and depends on each worker's correct use
PPE leaves the hazard in place and protects only the person wearing it, and only if it is selected, fitted, worn, and maintained correctly. Higher- level controls reduce or remove the hazard for everyone.
Question 9 · Noise Exposure
Why is noise-induced hearing loss often not noticed until it is advanced?
- A.It causes ear pain early, which workers learn to ignore
- B.It develops gradually and painlessly, starting near 4,000 Hz
- C.It begins at low frequencies that do not affect speech
- D.It reverses overnight, so early shifts are not noticed
Show answer and explanation
Answer: B. It develops gradually and painlessly, starting near 4,000 Hz
Noise-induced hearing loss usually begins around 4,000 Hz, above the main speech frequencies, and develops gradually without pain. Workers often notice it only when speech becomes hard to understand.
Question 10 · Emergency Response Plans
When should employees be trained on the emergency action plan?
- A.When the plan is developed, at assignment, and when duties or the plan change
- B.Only after the first emergency or drill shows a gap in the plan
- C.At hire, then once every five years at the plan audit
- D.At hire for supervisors; others follow their supervisor's direction
Show answer and explanation
Answer: A. When the plan is developed, at assignment, and when duties or the plan change
Employees must review the parts of the plan they need to know when the plan is developed, upon initial assignment, when their responsibilities change, and whenever the plan changes.

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