WHMIS Hazard Classes and Pictograms 2

Question 1

Which WHMIS 2015 pictogram depicts a cylinder shape and indicates gases stored under pressure?

Accepted Answer

Gas cylinder

Answer

The gas cylinder pictogram applies to compressed, liquefied, dissolved, and refrigerated liquefied gases stored under pressure.

Question 2

The 'flame over circle' pictogram in WHMIS specifically identifies which type of hazard?

Accepted Answer

Oxidizing substances that can intensify fires

Answer

The flame over circle pictogram indicates oxidizing substances, which can provide oxygen to support and intensify combustion.

Question 3

Sodium metal, which reacts violently with water to release hydrogen gas, belongs to which WHMIS hazard class?

Accepted Answer

Substances that emit flammable gases on contact with water (Class 4.3)

Answer

Class 4.3 covers substances that react with water to produce flammable gases, such as sodium or potassium metals.

Question 4

A Dewar flask of liquid nitrogen in a laboratory would most prominently display which WHMIS pictogram?

Accepted Answer

Gas cylinder

Answer

Liquid nitrogen is a refrigerated liquefied gas under pressure, so it carries the gas cylinder pictogram.

Question 5

Industrial-strength hydrogen peroxide at concentrations above 60% is most likely classified under which WHMIS hazard category?

Accepted Answer

Oxidizing liquids

Answer

High-concentration hydrogen peroxide is a powerful oxidizing liquid that can cause fires or explosions when it contacts organic material.

(WHMIS) Workplace Hazardous Materials Information System Practice Test