Free OHST Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation:

The correct answer is B.

Engineering controls reduce or eliminate hazards by modifying equipment, tools, or work processes. This may include automation, machine guards, ventilation systems, or isolation barriers.

These controls are highly effective because they do not rely on worker behavior. Instead, they physically reduce exposure at the source.

OHST professionals prioritize engineering controls because they provide long-term, consistent protection and are more reliable than PPE or administrative controls.

Comprehensive and Detailed Explanation:

The correct answer is B.

Administrative controls include procedures, training, and scheduling methods designed to reduce exposure to hazards.

Safe work procedures guide employees on how to perform tasks safely.

Comprehensive and Detailed Explanation:

The correct answer is A.

Substitution involves replacing a hazardous material or process with a less hazardous one. For example, replacing a toxic solvent with a water-based alternative significantly reduces risk at the source.

OHST professionals prefer substitution early in hazard control because it reduces risk without relying heavily on worker behavior.

Comprehensive and Detailed Explanation:

The correct answer is B.

PPE depends heavily on worker behavior because it must be worn correctly and consistently to be effective.

While PPE is essential, it is the least reliable control method because it does not eliminate the hazard.

OHST professionals use PPE as a last line of defense when higher-level controls are not feasible.

Comprehensive and Detailed Explanation:

Risk assessment begins with identifying hazards. Therefore, C is the correct answer.

A hazard cannot be evaluated or controlled until it is recognized. Hazard identification may involve inspections, employee interviews, incident investigations, job hazard analyses, safety audits, exposure monitoring, and review of historical records. Once hazards are identified, the organization evaluates the likelihood and severity of potential consequences. This information helps determine risk levels and prioritize corrective actions.

After risk evaluation, controls are selected according to the hierarchy of controls, which prioritizes elimination, substitution, engineering controls, administrative controls, and personal protective equipment. Continuous monitoring and periodic reassessment ensure controls remain effective.

OHST professionals routinely participate in hazard identification and risk assessment activities. These processes help organizations proactively address potential problems before incidents occur. A systematic risk management approach improves safety performance, reduces losses, supports regulatory compliance, and contributes to a stronger safety culture. Effective hazard identification serves as the foundation for every other component of a safety management system.