CHST Health Hazards and PPE 3

Question 1

Under OSHA 1910.134, which type of respirator is required when entering an Immediately Dangerous to Life or Health (IDLH) atmosphere?

Accepted Answer

Self-Contained Breathing Apparatus (SCBA) operated in pressure-demand mode, or a supplied-air respirator with escape SCBA

Answer

A full-face air-purifying respirator with combination cartridges

Answer

A PAPR with high-efficiency filters

Answer

Any respirator with an APF of at least 50

Question 2

What health hazards are associated with prolonged exposure to Portland cement on construction sites?

Accepted Answer

Silicosis risk from crystalline silica content, skin sensitization from hexavalent chromium, and severe chemical burns from wet cement's high alkalinity

Answer

Explosive hazard from rapid chemical reaction with water

Answer

Flammable vapor hazard during mixing

Answer

Asphyxiation hazard only from fine particle inhalation

Question 3

In the hierarchy of controls, where does personal protective equipment (PPE) rank, and why?

Accepted Answer

PPE is the lowest-order (last resort) control because it protects workers from exposure but does not eliminate or reduce the hazard itself

Answer

PPE is the highest-order control because it is the most reliable protection method

Answer

PPE ranks second, just below engineering controls

Answer

PPE ranks third, between administrative controls and engineering controls

Question 4

Which sign and symptom combination is the cardinal indicator that distinguishes heat stroke from heat exhaustion?

Accepted Answer

Core body temperature above 104°F combined with central nervous system dysfunction such as confusion, disorientation, or loss of consciousness

Answer

Profuse sweating and pale, cool, moist skin

Answer

Muscle cramps in the legs and abdomen with normal temperature

Answer

Core body temperature between 100°F and 103°F with headache only

Question 5

Under the GHS-format SDS, which section contains exposure controls and personal protective equipment requirements?

Accepted Answer

Section 8 — Exposure Controls/Personal Protection

Answer

Section 2 — Hazard Identification

Answer

Section 11 — Toxicological Information

Answer

Section 4 — First-Aid Measures

Question 6

What does the 'action level' represent in OSHA's chemical exposure standards, and what obligations does it trigger?

Accepted Answer

The concentration at which medical surveillance, exposure monitoring, and preventive programs are required — typically set at half the PEL

Answer

The concentration at which work must immediately stop

Answer

The IDLH concentration divided by 10

Answer

The same concentration as the PEL