10 exam-style questions with answers and explanations, straight from our 1,050-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The STS exam has 100 questions and runs 2 hours.
These 10 free STS questions are organized by exam domain, so you can see how each part of the Safety Trained Supervisor (STS) blueprint is tested. Reveal the answer and explanation under each question.
A new hire completed general safety orientation on Monday and is assigned to the packaging line on Tuesday. Before the employee begins work, the supervisor's most important remaining orientation duty is to:
Correct answer: A - Walk the employee through the specific hazards and controls of the packaging line
A supervisor is developing a Job Safety Analysis (JSA) for a drum-handling task. Which sequence correctly reflects how a JSA is built?
Correct answer: C - Break the job into steps, identify the hazards of each step, determine controls
An employee arrives for shift smelling of alcohol and with slurred speech. The supervisor's first action should be to:
Correct answer: D - Remove the employee from the work area and follow fitness-for-duty referral
During a routine inspection, a supervisor finds a damaged guardrail on an elevated platform that is currently in use. The correct immediate action is to:
Correct answer: A - Control access to the area and start repair, then document finding and correction
A newly hired employee invokes Stop Work Authority on a task performed by a 20-year veteran. Work stops, and the review determines the task was actually being done correctly. Under an effective Stop Work Authority program, the employee should be:
Correct answer: B - Recognized for raising the concern, with the review outcome explained
A supervisor needs to determine the required PPE for handling a solvent. Which Safety Data Sheet section provides this information?
Correct answer: A - Section 8 - Exposure Controls
A supervisor reviews the driver inspection log for a company truck and finds the same brake defect recorded on three consecutive reports, each signed off as "monitor." This documentation pattern should be read as:
Correct answer: C - Evidence the defect-correction process failed; remove the truck from service
A grinding operation generates airborne dust. Four options have been proposed. Which represents the highest level of the hierarchy of controls?
Correct answer: C - Substitute a wet grinding process that suppresses dust at the source
A risk assessment rates a hazard as low probability but catastrophic severity. The most appropriate supervisory response is to:
Correct answer: A - Implement controls, because the severity justifies risk reduction
A machine guard on a power press must be removed to clear a jam that happens several times per shift. The best control approach is to:
Correct answer: D - Correct the root cause of the jamming so guard removal is not routine
The STS exam also covers these domains. Drill them in the full free practice test:
The full bank has 1,040 more STS questions with explanations.
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