OSH Security Practice Test

Which of the following is NOT a WHMIS hazard class?

1. Gases under pressure

2. Oxidizing liquids

3. Flammable liquids

4. None of the above

The correct answer is: None of the above

The correct selection indicates that all the options listed are indeed recognized WHMIS (Workplace Hazardous Materials Information System) hazard classes. WHMIS is a comprehensive communication standard in Canada that outlines various classifications for hazardous materials in the workplace, and it is essential for ensuring worker safety. Gases under pressure is a WHMIS hazard class because it includes any gas that is stored in a cylinder under high pressure or in liquid form that will vaporize upon release. Oxidizing liquids also fall under WHMIS classifications as they can cause or enhance the combustion of other materials. Flammable liquids, another recognized hazard class, refer to liquids that can catch fire easily when exposed to ignition sources. Choosing "None of the above" as the answer implies that the respondent believes that at least one of the listed options is not a WHMIS hazard class, which is incorrect since all provided choices are, in fact, valid WHMIS hazard classes. Thus, the correct answer underscores that there are no options among the given that are outside the scope of WHMIS classifications.