WHMIS Hazard Classes and Symbols 4

Question 1

Which WHMIS 2015 class covers thermally unstable substances that can undergo exothermic decomposition without an oxidizer?

Accepted Answer

Self-reactive substances

Answer

Organic peroxides

Answer

Explosives

Answer

Oxidizing solids

Question 2

In WHMIS 2015, what distinguishes a Category 1 hazard from a Category 2 hazard within the same class?

Accepted Answer

Category 1 is more hazardous (most severe); Category 2 is less hazardous

Answer

Category 1 is less hazardous; Category 2 is more hazardous

Answer

Categories refer to physical vs. health hazards

Answer

Category numbers indicate the regulatory body that classified them

Question 3

Which combination of pictograms would appear on a strong acid like concentrated sulfuric acid?

Accepted Answer

Corrosion + exclamation mark (or skull and crossbones depending on concentration)

Answer

Skull and crossbones + exploding bomb

Answer

Health hazard + flame

Answer

Gas cylinder + corrosion

Question 4

Which WHMIS 2015 health hazard class specifically applies to substances that damage lung tissue if accidentally swallowed and aspirated?

Accepted Answer

Aspiration hazard

Answer

Respiratory sensitization

Answer

STOT — single exposure

Answer

Acute toxicity — inhalation

Question 5

The 'environment' pictogram (dead fish and tree) in WHMIS 2015 is used for substances with what property?

Accepted Answer

Acute or chronic aquatic toxicity

Answer

Land contamination hazards

Answer

Air pollution potential

Answer

Soil reactivity

Question 6

Under WHMIS 2015, germ cell mutagenicity refers to substances that can cause what type of harm?

Accepted Answer

Heritable genetic mutations in reproductive cells

Answer

Damage to liver and kidney cells

Answer

Immediate toxic effects to skin cells

Answer

Allergic skin reactions

Question 7

Which statement about WHMIS 2015 physical hazard classes is correct regarding 'flammable aerosols'?

Accepted Answer

They are classified as flammable if either the propellant or any component is flammable

Answer

They are classified only if the propellant is flammable

Answer

They are never considered physical hazards

Answer

They are classified only by flash point of the liquid contents