A cylinder of an oxidizing gas is leaking during a fire. What does CCOHS say about stopping the leak?
WHMIS: Emergencies, spills and first aid
Where emergency information is on the SDS, reporting leaks and spills, fire and evacuation basics, eyewash and showers, and standard first-aid steps by route of exposure.
- No sign-up
- Every answer explained
- Independent · not a government site
- 19 questions
- Topic drill
Study reference: CCOHS OSH Answers: How to Work Safely with Hazardous Products (pictogram series, revised 2024), Ch. 10 Emergencies and first aid — Emergency sections of each pictogram fact sheet, SDS sections 4 to 6
All 19 questions in this test
Every question and its answer choices. The correct answers and explanations appear when you take the test above.
A cylinder of an oxidizing gas is leaking during a fire. What does CCOHS say about stopping the leak?
- Never touch the cylinder at all
- Always stop it, whatever the danger
- Stop it only if it is safe to do so
- Hit the valve to seal it
Where on the SDS will you find the emergency telephone number for the product?
- Section 15, Regulatory information
- Section 9, Physical properties
- Section 1, Identification
- Section 12, Ecological information
Where should an eyewash station and emergency shower be when hazardous products are used?
- Only in the first-aid room on the floor upstairs
- In another building on site
- Anywhere, as long as one exists
- Readily available in the immediate work area
A worker is exposed to a toxic product and an ambulance is called. What should go with them?
- The empty product container only
- The purchase receipt
- The worker's training certificate
- A copy of the SDS for the medical team
A co-worker gets a corrosive product in their eyes. What is the standard first step?
- Rinse with the product's solvent
- Rinse cautiously with water for several minutes
- Rub the eyes to remove the product
- Cover the eyes with a cloth and wait for symptoms
You must clean up blood after an accident at work. Which precaution is correct?
- Clean it with bare hands quickly
- Assume it is safe if it looks clean
- Treat it as infectious and wear gloves
- Leave it for the next shift
In case of fire, how many exit paths should you know from your work area?
- Only the main entrance
- At least two
- One is enough
- None, if there is a sprinkler
Your work boots are soaked with a flammable liquid. What does CCOHS advise?
- Wipe them and keep working
- Keep them on and let them dry, since vapours escape quickly
- Dry them next to a heater
- Remove them, since they are a severe fire hazard
A large fire involves organic peroxides that could explode. What is the safest approach?
- Pour water on the containers by hand
- Evacuate and fight the fire only from a distance
- Open the containers to release pressure before it builds
- Get close and use a small extinguisher
Someone swallows a corrosive product. What should you NOT do?
- Check the SDS first-aid section
- Make them vomit
- Rinse their mouth
- Call a Poison Centre or doctor
A worker's hand is frosted by contact with a refrigerated liquefied gas. What is the right first aid?
- Rub it hard with a dry towel to restore circulation
- Pack it in ice
- Hold it near a hot heater
- Thaw it with lukewarm water and do not rub it
A worker feels unwell after breathing in a product's vapour. What is the first-aid step on most labels?
- Make them breathe into a paper bag
- Move the person to fresh air and keep them comfortable
- Have them lie down in the work area until the feeling passes
- Give them a glass of milk to drink
You notice a hazardous product leaking from a container. What should you do first?
- Sniff it to identify the product
- Ignore it if the smell is faint
- Report it and warn people nearby
- Wait until the end of your shift
How often should eyewash stations and emergency showers be checked?
- Never, once they are installed
- Regularly, as they must be tested to work
- Only when an inspector visits the workplace
- Only after they have been used
Which material should you avoid using to soak up a flammable liquid spill?
- Approved spill absorbent
- Paper towels or sawdust
- Non-sparking tools
- Proper PPE
Who should the employer notify about the location, types and quantities of hazardous products stored on site?
- The local fire department
- The workers' banks
- The local school board
- The product's advertising agency
A highly toxic product spills and an escape respirator is required for your area. What should you do?
- Put on the escape respirator and leave the area
- Stay and wipe up the spill quickly
- Wait for the vapour to clear on its own
- Open a window and keep working
A corrosive liquid splashes onto a worker's clothing and skin. What should be done?
- Cover the area with a dry bandage and wait for help
- Remove soaked clothing and rinse skin with water
- Leave the clothing on until it dries
- Apply grease to the skin
A co-worker collapses in a tank where an asphyxiant gas leaked. What must you do before a rescue?
- Protect yourself first with proper equipment
- Turn off the lights to stop sparks, then go in
- Hold your breath and go in
- Rush in and pull them out
Emergencies, spills and first aid: key rules to remember
Our summary of what the official handbook says on this topic, in our own words. Read it before or after the practice questions above, then check the original chapter. Read the official chapter ↗
Emergency information (CCOHS SDS fact sheet)
- Section 4 first aid; Section 5 fire-fighting; Section 6 accidental release; Section 1 emergency phone number (may be non-Canadian; restrictions such as hours or language stated). Section 2 summarizes what to do in an emergency.
- Precautionary "response" statements on the label include first aid; e.g., "If exposed or concerned: Get medical advice/attention."
emergency steps common to all pictograms
- Understand and practise emergency procedures before you need them.
- Eyewash and emergency shower readily available in the immediate work area; tested regularly.
- Spill control procedures and equipment ready (absorbents, PPE, non-sparking tools where needed).
- Immediately report leaks to your supervisor, warn people in the area, move to a safe location if necessary.
- Know at least two exit paths in case of fire; appropriate fire extinguishers available.
- Do not use combustible materials (paper towels, sawdust) to absorb flammable or oxidizer spills.
- Remove contaminated clothing; flammable-soaked clothing and leather shoes/boots are a fire hazard; wash before re-wearing.
First aid by route (precautionary wording, corrosion/skull/health hazard pages)
- If inhaled: move person to fresh air, keep comfortable for breathing; call Poison Centre or doctor as directed.
- If on skin (or hair): take off contaminated clothing immediately; rinse skin with water or shower; wash clothing before reuse.
- If in eyes: rinse cautiously with water for several minutes; remove contact lenses if present and easy; continue rinsing.
- If swallowed (corrosive, aspiration hazard): rinse mouth; do NOT induce vomiting; call Poison Centre or doctor.
- Refrigerated liquefied gas contact: thaw frosted parts with lukewarm water; do not rub; get medical attention.
- Oxidizer on clothing: rinse contaminated clothing and skin with plenty of water before removing clothes.
- Toxic products: have medical response ready (antidotes, copy of SDS for the doctor/first responders).
Fire and explosion
- Oxidizers/Type B self-reactives: in major fire, evacuate, fight fire remotely due to explosion risk.
- Type A (exploding bomb): evacuate; do not fight fire when it reaches the product.
- Gas fire: stop the leak if safe to do so.
Toxic or asphyxiant releases
- Spill of acute toxicity product or asphyxiant leak: put on an escape-type respirator if required and exit the area.
- Oxygen deficiency rescue: protect yourself first (proper equipment) before attempting rescue; move victim to fresh air; call Poison Centre/doctor.
emergencies
- Assume tissue, blood or body fluids are infectious; cover cuts and wear gloves; be careful with sharps; wash hands; sanitize; report exposures to the designated person.
emergency procedures
- Review first-aid, spill and firefighting procedures; notify the local fire department of the location, types and quantities of hazardous products.
Study the Emergencies, spills and first aid rules as flashcards →
Other topics
- What WHMIS isWhat the Workplace Hazardous Materials Information System is, its four main parts, how it lines up with the GHS, what counts as a hazardous product and which products are excluded.
- WHMIS law and enforcementWHMIS 1988, WHMIS 2015 and the December 2022 amendments, the Hazardous Products Act and Regulations, who enforces WHMIS in each jurisdiction and what an inspector checks.
- Supplier, employer and worker dutiesWho counts as a supplier, manufacturer, importer or distributor, what employers must provide, what workers must do, and the role of the health and safety committee.
- WHMIS education and trainingThe difference between education and site-specific training, who must be trained, what it must cover, the four questions every worker should be able to answer, reviews and refreshers.
- Hazard groups, classes and categoriesThe physical and health hazard groups, how classes group similar products, how categories and types show severity, and what changed in the 2022 amendments.
- Physical hazard classesFlammables, oxidizers, gases under pressure, pyrophoric and self-heating products, water-reactives, organic peroxides, corrosive to metals, combustible dusts, simple asphyxiants and chemicals under pressure.
- Health hazard classesAcute toxicity, skin and eye damage, sensitizers, mutagens, carcinogens, reproductive toxicity, target organ toxicity, aspiration hazard and biohazardous infectious materials.
- WHMIS pictogramsThe red-bordered diamond pictograms described in words: flame, flame over circle, gas cylinder, corrosion, exploding bomb, skull and crossbones, health hazard, exclamation mark and the biohazard symbol, plus classes with no pictogram.
- Supplier labelsThe required parts of a supplier label, the two signal words, hazard and precautionary statements, bilingual rules, small-container exemptions and the 180-day update rule.
- Workplace labels and other identificationWhen a workplace label is needed (decanting, products made on site, lost labels), the decanting exceptions, what a workplace label must say, and other means of identification.
- Safety data sheets (16 sections)What an SDS is, the 16 sections in their required order, which sections workers use most, update rules, and the employer's duty to keep SDSs available.
- Safe handling and storageEveryday precautions by pictogram: ventilation, ignition sources, incompatibles, gas cylinders, corrosives, toxic products, storage height, cabinets and controls such as substitution and PPE.
- Ontario WHMIS rules (Regulation 860)How Ontario applies WHMIS through the Occupational Health and Safety Act and Regulation 860: who is covered, decanted containers, SDS access, annual review of training, exemptions and hazardous waste.