CHST - Construction Health and Safety Technician Health Hazards and PPE Questions and Answers

Question 1

A construction worker is tasked with dry cutting concrete block with a handheld power saw for a full 8-hour shift.
According to OSHA's silica standard for construction (29 CFR 1926.1153), which of the following represents the most effective and compliant method for controlling the respirable crystalline silica hazard?

Accepted Answer

Using a saw equipped with an integrated water delivery system.

Answer

Providing the worker with a half-mask respirator with an APF of 10.

Answer

Restricting access to the work area and using a fan for ventilation.

Answer

Implementing job rotation to limit each worker's cutting time to two hours.

Question 2

A safety technician calculates the required attenuation for hearing protection in an area with an A-weighted Time-Weighted Average (TWA) noise exposure of 102 dBA. The company policy is to use OSHA's standard formula for estimating workplace protection. If a worker uses earplugs with a Noise Reduction Rating (NRR) of 33, what is the estimated exposure in dBA under the protector?

Accepted Answer

76 dBA

Answer

69 dBA

Answer

84 dBA

Answer

70 dBA

Question 3

According to OSHA regulations for personal fall arrest systems (PFAS) in construction, when must the equipment be inspected?

Accepted Answer

Before each use by the user and annually by a competent person.

Answer

Annually by a qualified person.

Answer

Only after a fall event has occurred.

Answer

At the beginning of each new project by the site supervisor.

Question 4

A worker is assigned to a task where the airborne concentration of a hazardous substance is 400 µg/m³. The Permissible Exposure Limit (PEL) for this substance is 50 µg/m³. The worker is provided with a half-mask air-purifying respirator. What is the minimum Assigned Protection Factor (APF) required, and does the provided respirator meet this requirement?

Accepted Answer

APF 10; Yes, the respirator is adequate.

Answer

APF 5; Yes, the respirator is adequate.

Answer

APF 10; No, a higher level of protection is needed.

Answer

APF 8; Yes, the respirator is adequate.

Question 5

During lead abatement activities involving manual scraping of lead-based paint, which of the following housekeeping practices is explicitly prohibited by OSHA's Lead in Construction standard (29 CFR 1926.62)?

Accepted Answer

Using compressed air to remove lead dust from surfaces.

Answer

Using a HEPA-filtered vacuum for cleanup.

Answer

Wet-sanding the painted surfaces.

Answer

Placing contaminated clothing in sealed containers.

Question 6

Which of the following is considered the LEAST effective method for controlling workplace hazards according to the hierarchy of controls?

Accepted Answer

Personal Protective Equipment (PPE)

Answer

Substitution

Answer

Engineering controls

Answer

Administrative controls