FREE CRST Occupational Hygiene Fundamentals Questions and Answers

Question 1

An employee working with powdered pigments frequently has dust on their hands and forearms but wears a standard dust mask.
Which route of entry is MOST likely for a chemical to enter their bloodstream, besides inhalation?

Accepted Answer

Absorption

Answer

Ingestion

Answer

Injection

Answer

Puncture

Question 2

In occupational hygiene, what is the fundamental difference between 'fumes' and 'dusts'?

Accepted Answer

Fumes result from condensation of a vaporized solid, whereas dusts are generated by mechanical action.

Answer

Fumes are liquid droplets, whereas dusts are solid particles.

Answer

Fumes are larger than 2.5 micrometers, whereas dusts are smaller.

Answer

Fumes are always toxic, whereas dusts are considered nuisance particles.

Question 3

A safety technician is reviewing a Safety Data Sheet (SDS) for a new solvent. They see a Threshold Limit Value (TLV) listed. What does the TLV, as established by the ACGIH, represent?

Accepted Answer

A recommended airborne concentration to which nearly all workers may be exposed daily without adverse effect.

Answer

A mandatory federal exposure limit that cannot be legally exceeded.

Answer

The concentration at which a worker will first begin to feel adverse health effects.

Answer

The maximum legally permissible concentration averaged over a 15-minute period.

Question 4

A local exhaust ventilation (LEV) system is installed to control welding fumes at the source. Which of the following is the primary purpose of this type of ventilation?

Accepted Answer

To capture and remove airborne contaminants at their point of generation.

Answer

To cool the general work area for thermal comfort.

Answer

To dilute the contaminant concentration throughout the entire facility.

Answer

To provide a continuous supply of fresh, breathable air to the entire building.

Question 5

In most Canadian jurisdictions, when noise exposure levels are measured to determine if a hearing conservation program is needed, what is the typical action level for an 8-hour time-weighted average (TWA)?

Accepted Answer

85 dBA

Answer

75 dBA

Answer

90 dBA

Answer

100 dBA

Question 6

Which of the following is a primary goal of an occupational hygiene program within an organization?

Accepted Answer

To anticipate, recognize, evaluate, and control health hazards in the workplace.

Answer

To respond to workplace injuries after they occur.

Answer

To ensure compliance with building fire codes.

Answer

To manage employee payroll and benefits related to health.

An employee working with powdered pigments frequently has dust on their hands and forearms but wears a standard dust mask.Which route of entry is MOST likely for a chemical to enter their bloodstream, besides inhalation?

An employee working with powdered pigments frequently has dust on their hands and forearms but wears a standard dust mask.
Which route of entry is MOST likely for a chemical to enter their bloodstream, besides inhalation?