Basic Safety & Health Flashcards
9 cards from real NCCER CORE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 9 Basic Safety & Health flashcards as text
What is the primary purpose of wearing a hard hat on a construction site?
Answer: Protect against head injuries
Hard hats are essential personal protective equipment (PPE) on construction sites, specifically designed to protect workers from falling objects, impacts, and electrical hazards. They significantly reduce the risk of severe head injuries, which are common and potentially fatal in environments with overhead work or moving equipment. Wearing a hard hat is a fundamental safety requirement.
Which color is commonly used for caution signs to indicate potential hazards on the job site?
Answer: Yellow
In safety signage, the color yellow is universally recognized and commonly used for caution signs to indicate potential hazards that could result in minor to moderate injuries. This color choice helps draw attention to areas requiring vigilance, such as wet floors, tripping hazards, or areas with moving equipment, prompting workers to proceed with care.
When lifting heavy materials manually, which technique helps prevent back injuries?
Answer: Lift with your legs, keeping back straight
When lifting heavy materials manually, the correct technique to prevent back injuries is to bend at the knees, keep your back straight, and lift using the powerful muscles in your legs. This method minimizes strain on the back and spine, distributing the load more safely. Holding the load close to your body also reduces leverage and further protects your back.
What is the minimum safe distance to keep from a power line carrying up to 50 kV according to OSHA?
Answer: 10 feet
According to OSHA (Occupational Safety and Health Administration) regulations, a minimum safe distance must be maintained from power lines to prevent electrocution. For power lines carrying up to 50 kV, the required minimum clearance is 10 feet. This distance helps protect workers from accidental contact or arc flashes, which can be fatal.
Which class of fire extinguisher is suitable for electrical fires?
Answer: Class C
Class C fire extinguishers are specifically designed for fires involving energized electrical equipment. Using water-based extinguishers (Class A) on electrical fires is extremely dangerous as water conducts electricity, posing a severe electrocution risk. Class C extinguishers contain non-conductive agents like carbon dioxide or dry chemicals that safely suppress electrical fires without creating an electrical hazard.
Why is housekeeping important for job‑site safety?
Answer: It reduces trip and fall hazards
Good housekeeping on a job site involves keeping work areas clean, organized, and free of clutter. This practice directly reduces the risk of trip and fall hazards, which are among the most common causes of injuries in construction. By removing debris, tools, and materials from walkways and work zones, workers can move safely and efficiently, preventing accidents.
What should be done first if you discover a chemical spill on site?
Answer: Notify coworkers and isolate area
The immediate priority when discovering a chemical spill is to ensure the safety of personnel and prevent further contamination. Notifying coworkers allows them to evacuate or take protective measures, while isolating the area prevents others from inadvertently entering the hazardous zone. This initial response minimizes exposure risks and allows trained personnel to address the spill safely and effectively.
Which personal protective equipment (PPE) is required when using a grinder that produces flying debris?
Answer: Safety goggles or face shield
When using a grinder, flying debris such as metal shards, sparks, and abrasive particles are a significant hazard that can cause severe eye injuries. Safety goggles or a face shield provide essential protection by creating a barrier against these projectiles. This PPE is crucial for preventing permanent vision damage and ensuring worker safety.
OSHA requires a competent person to inspect excavations daily for hazards such as:
Answer: Cave‑in potential and atmospheric hazards
OSHA mandates that a competent person inspect excavations daily, and after any event that could increase hazards, specifically to identify and mitigate risks like cave-ins and atmospheric hazards. Cave-ins are a leading cause of fatalities in trenching and excavation work, while hazardous atmospheres (e.g., oxygen deficiency, toxic gases) can cause incapacitation or death. These inspections are crucial for ensuring worker safety in confined and unstable environments.