WHMIS Hazard Classes and Symbols 5

Question 1

WHMIS 2015 replaced WHMIS 1988 by aligning with which international system?

Accepted Answer

UN Globally Harmonized System (GHS) of Classification and Labelling of Chemicals

Answer

WHMIS 2015 integrated the United Nations' Globally Harmonized System (GHS) to standardize hazard classification and communication globally.

Question 2

In WHMIS 2015, which hazard class replaced the old WHMIS 1988 'biohazardous infectious material' class?

Accepted Answer

It was retained as a WHMIS-specific (non-GHS) class with the same name

Answer

Biohazardous infectious materials is a Canada-specific hazard class kept in WHMIS 2015 because GHS does not cover biological hazards; it retains its own biohazard symbol.

Question 3

A workplace receives a drum labelled with only a 'flame' pictogram and no other hazard symbols. What does this most likely indicate?

Accepted Answer

The product poses a flammable physical hazard with no other classified hazards

Answer

A single flame pictogram indicates the product has only a flammable physical hazard (e.g., a Category 3 flammable liquid) and no other classified hazards requiring additional pictograms.

Question 4

Under WHMIS 2015, 'STOT' stands for what?

Accepted Answer

Specific Target Organ Toxicity

Answer

STOT — Specific Target Organ Toxicity — refers to substances that cause damage to specific organs (liver, kidney, nervous system, etc.) either after a single or repeated exposure.

Question 5

Which WHMIS 2015 class covers products that release heat slowly through reaction with oxygen and may ignite after hours or days?

Accepted Answer

Self-heating substances and mixtures

Answer

Self-heating substances accumulate heat through oxidation slowly over time and can ignite spontaneously after prolonged exposure, unlike pyrophorics which ignite within minutes.

(WHMIS) Workplace Hazardous Materials Information System Practice Test

(WHMIS) Workplace Hazardous Materials Information System Practice Test

WHMIS Hazard Classes and Symbols 5