The Common Safety Orientation (CSO) is a mandatory safety certification for workers entering Alberta's construction industry. Before stepping onto a regulated worksite, workers must demonstrate knowledge of the Alberta OHS Act, hazard identification, PPE requirements, WHMIS 2015, and emergency response procedures. This practice test PDF helps you study all of those topics and walk into your CSO exam with confidence.
Whether you're a new construction worker, a tradesperson moving to a new employer, or a site supervisor brushing up before a recertification, these questions reflect the real CSO assessment format. Download the PDF, work through the questions offline, and review the explanations for any answers you miss.
The Alberta Occupational Health and Safety Act is the primary legislation governing workplace safety in the province. The Act defines the general duties of employers, workers, supervisors, prime contractors, and owners on construction sites. Employers must ensure the health, safety, and welfare of all workers, provide the information, instruction, training, and supervision workers need to do their jobs safely, and ensure equipment and worksites meet OHS standards. Workers have corresponding obligations: to take reasonable care of their own health and safety, to cooperate with their employer's safety program, and to report hazardous conditions to a supervisor.
The OHS Code under the Act contains the detailed, technical rules — fall protection specifications, scaffold requirements, electrical safety distances, excavation shoring rules, and much more. The CSO exam focuses on the Act's general duty clauses and the most commonly applied sections of the Code on Alberta construction sites. Questions typically ask who is responsible for a specific safety action, what must happen before a worker begins a high-risk task, or what documentation is required after a near-miss or incident.
Prime contractors hold special responsibility under the Act: when multiple employers share a worksite, the prime contractor must coordinate overall safety and ensure all employers and workers comply with OHS requirements. This concept appears frequently in CSO exam scenarios involving multi-trade construction sites where subcontractors work alongside the general contractor's own crew.
Every worker entering an Alberta construction site is expected to participate in hazard identification. The standard process involves recognizing the hazard (anything that could cause harm), assessing the risk (how likely is harm to occur and how severe would it be), and applying controls using the hierarchy of controls: elimination, substitution, engineering controls, administrative controls, and personal protective equipment — in that order of preference.
Job Hazard Assessments (JHAs) — also called Job Safety Analyses (JSAs) or Field Level Risk Assessments (FLRAs) — are the practical tools workers use before beginning any task. A field-level risk assessment takes only a few minutes and asks three questions: What could go wrong? How likely and how severe? What can I do to reduce the risk? Under Alberta OHS regulations, a formal written hazard assessment is required before any work begins at a new worksite or when there is a change in the work being done.
Common construction hazards covered on the CSO exam include falls from heights (the leading cause of construction fatalities), struck-by hazards (from moving equipment, falling objects, or swinging loads), caught-in or caught-between hazards (in machinery, between heavy materials), electrical hazards (contact with overhead or buried power lines), and excavation cave-in hazards. Understanding each hazard category and the controls that address it — guardrails and fall arrest for heights, barricades and hard hats for falling objects, lockout/tagout for machinery — is essential for both the exam and real worksite safety.
Personal protective equipment is the last line of defence in the hierarchy of controls — it doesn't eliminate the hazard but protects the worker when other controls aren't sufficient. Alberta construction sites have mandatory PPE minimums: Class E hard hat (electrical protection), high-visibility safety vest (Class 2 minimum in most traffic and equipment zones), CSA-approved safety-toed footwear, and safety glasses where eye hazards exist. Fall arrest systems — full-body harness, lanyard, and anchor rated to withstand fall forces — are required for work at heights of 3 metres or greater on most construction applications.
Respiratory protection varies by hazard. Dust masks (N95 filtering facepiece respirators) protect against particulates like silica dust and wood dust. Half-face respirators with organic vapour cartridges protect against solvent fumes and paint vapours. Supplied-air respirators are required for oxygen-deficient or immediately dangerous to life and health (IDLH) atmospheres. The CSO exam tests knowledge of when each respirator type is appropriate, not just which respirators exist.
WHMIS 2015 aligned Canada's workplace hazardous materials system with the United Nations Globally Harmonized System (GHS). Every controlled product on a construction site must have a compliant label with a product identifier, hazard pictograms (nine GHS pictograms cover flammables, corrosives, toxics, explosives, etc.), signal words (Danger or Warning), hazard statements, precautionary statements, and supplier information. The Safety Data Sheet (SDS) has 16 standardized sections; Section 2 (Hazard Identification) and Section 8 (Exposure Controls and Personal Protection) are the most frequently tested on the CSO exam. Workers must know where SDS documents are kept on site and how to read them before handling any controlled product.
Every Alberta construction site is required to have an emergency response plan that covers evacuation routes and muster points, fire extinguisher locations and classes (A for ordinary combustibles, B for flammable liquids, C for electrical, D for metals, K for cooking oils), first aid requirements based on workforce size and site remoteness, and incident reporting obligations. Workers must know the evacuation procedure for their specific site, the location of the nearest first aid station, and what to do if they discover a fire, chemical spill, or injured worker.
Incident reporting under Alberta OHS law requires workers and employers to report serious injuries, near-misses, and dangerous incidents to OHS immediately in some cases and in writing within specified timeframes. Failure to report can result in fines or prosecution. The CSO exam regularly tests the distinction between what must be reported immediately (fatalities, serious injuries, incidents with potential for serious harm) and what requires a written report within a specified timeframe.
Worker rights under the Alberta OHS Act are foundational to the CSO certification. The right to know means workers must be informed about hazards on their worksite and trained on safe work procedures before they begin work. The right to participate means workers have the right to be involved in health and safety programs, including through joint work site health and safety committees or worker health and safety representatives. The right to refuse unsafe work is among the most important protections: a worker who reasonably believes a work activity presents a danger to themselves or others may refuse to perform that work and must report it to a supervisor. The supervisor must investigate, and if the dispute is not resolved, OHS can be contacted. Workers cannot be penalized for refusing genuinely unsafe work.
The CSO certification isn't just a checkbox — it's the knowledge that keeps you and your crew safe every day on an Alberta construction site. Download the free CSO practice test PDF above, work through the questions on OHS legislation, hazard assessment, PPE, WHMIS, emergency response, and worker rights, and review the answer explanations for any topic where you lose points. Return to this page for additional online CSO practice tests to reinforce what you've learned before your certification exam.