NSC Workplace Safety 4

Question 1

Which of the following is NOT one of the three elements of the fire triangle?

Accepted Answer

Pressure

Answer

The fire triangle consists of heat, fuel, and oxygen; pressure is not required for combustion.

Question 2

A worker is exposed to 50 ppm of a chemical for 4 hours and 100 ppm for 4 hours. What is the 8-hour TWA?

Accepted Answer

75 ppm

Answer

TWA = (50×4 + 100×4) / 8 = 600 / 8 = 75 ppm.

Question 3

What is the role of the 'attendant' in a confined space entry operation?

Accepted Answer

To remain outside and monitor the entrant, summoning rescue if needed

Answer

The attendant stays outside the permit space, monitors entrants continuously, and initiates rescue procedures if an emergency occurs.

Question 4

OSHA's general industry standard requires fall protection when workers are exposed to fall heights of how many feet or more?

Accepted Answer

4 feet

Answer

OSHA 29 CFR 1910.23 requires fall protection in general industry at heights of 4 feet or more.

Question 5

Which OSHA standard gives workers the 'right to know' about chemical hazards in their workplace?

Accepted Answer

Hazard Communication Standard (HCS)

Answer

The Hazard Communication Standard (29 CFR 1910.1200) requires chemical labeling and SDS access so workers know about hazards.

NSC Practice Test