Free NCCER Core Basic Safety & Health Questions and Answers 1

Question 1

What is the primary purpose of wearing a hard hat on a construction site?

Accepted Answer

Protect against head injuries

Answer

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.

Question 2

Which color is commonly used for caution signs to indicate potential hazards on the job site?

Accepted Answer

Yellow

Answer

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.

Question 3

When lifting heavy materials manually, which technique helps prevent back injuries?

Accepted Answer

Lift with your legs, keeping back straight

Answer

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.

Question 4

What is the minimum safe distance to keep from a power line carrying up to 50 kV according to OSHA?

Accepted Answer

10 feet

Answer

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.

Question 5

Which class of fire extinguisher is suitable for electrical fires?

Accepted Answer

Class C

Answer

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.

NCCER Core - National Center for Construction Education and Research Core Certification Practice Test

NCCER Core - National Center for Construction Education and Research Core Certification Practice Test

Free NCCER Core Basic Safety & Health Questions and Answers 1