Free OHST Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation:

The correct answer is B.

Substitution involves replacing a hazardous material or process with a less hazardous alternative. For example, replacing a toxic solvent with a water-based cleaning agent reduces chemical exposure risk.

OHST professionals consider substitution a high-level control because it reduces hazard severity at the source. However, careful evaluation is needed to ensure the replacement does not introduce new hazards.

Substitution is more effective than administrative controls or PPE because it directly reduces the inherent danger.

Comprehensive and Detailed Explanation:

18 ÷ 6 = 3 incidents per month.

So the correct answer is B.

OHST professionals use averages to identify trends and evaluate whether safety interventions are reducing incident frequency.

Comprehensive and Detailed Explanation:

The correct answer is B, Administrative control.

Administrative controls reduce risk by changing how work is performed rather than eliminating the hazard itself. Examples include training, job rotation, shift scheduling, safe work procedures, signage, and work permits.

These controls rely on human behavior and compliance, making them less reliable than engineering controls. However, they are still important when hazards cannot be eliminated or controlled through physical means.

OHST professionals often implement administrative controls as part of broader safety programs. For example, limiting exposure time to a hazardous environment can reduce overall risk. Training ensures employees understand hazards and follow procedures correctly.

Administrative controls are most effective when combined with higher-level controls in the hierarchy of controls.

Comprehensive and Detailed Explanation:

The correct answer is B.

A hazard control plan is designed to eliminate or reduce workplace risks by identifying hazards and implementing appropriate control measures. These plans are an essential part of a safety management system and are often developed following risk assessments or incident investigations.

A proper hazard control plan prioritizes controls based on the hierarchy of controls, starting with elimination and substitution, followed by engineering controls, administrative controls, andpersonal protective equipment. The goal is to reduce risk to an acceptable level and prevent injuries or illnesses.

OHST professionals play a key role in developing, implementing, and monitoring these plans. They ensure controls are practical, effective, and properly maintained over time. Regular review of hazard control plans ensures they remain relevant as workplace conditions change.

Comprehensive and Detailed Explanation:

Average speed is calculated using the formula:

Speed = Distance ÷ Time

So:

18 miles ÷ 3 hours = 6 mph

Therefore, the correct answer is C.

In occupational safety and industrial operations, basic calculations like speed are important for evaluating equipment movement, logistics safety, and operational efficiency. Forklifts and other powered industrial trucks operate in environments where both speed and control directly affect safety risk levels. Higher speeds can increase stopping distance, reduce reaction time, and increase the severity of incidents involving pedestrians or stationary objects.

OHST professionals often evaluate material handling operations to ensure safe travel speeds, proper traffic management, and controlled workflows. Understanding these basic mathematical relationships helps safety personnel assess whether operational practices are aligned with safe work procedures and risk reduction goals.