CITB Health, Safety, and Environmental Management 4

Question 1

Which gas is the leading cause of non-fire-related deaths in confined spaces on construction sites?

Accepted Answer

Hydrogen sulfide (H2S)

Answer

Hydrogen sulfide is extremely toxic, odorless at high concentrations, and frequently fatal in confined spaces like sewers and pits.

Question 2

What is the OSHA permissible exposure limit (PEL) for respirable crystalline silica in construction (action level)?

Accepted Answer

25 µg/m³ as an 8-hour TWA

Answer

The action level for respirable crystalline silica in construction is 25 µg/m³ as an 8-hour time-weighted average (TWA), triggering medical surveillance.

Question 3

A new piece of equipment arrives on-site. Before use, what safety document must the operator review?

Accepted Answer

The operator's manual and applicable SDS for lubricants/fluids

Answer

Operators must review the manufacturer's manual for safe operation procedures and SDS for any associated hazardous materials before use.

Question 4

What environmental protection measure is required when fueling heavy equipment near a body of water on a construction site?

Accepted Answer

Use secondary containment and spill kits to prevent fuel from reaching the water

Answer

Secondary containment berms and spill kits must be in place to capture any fuel spills and prevent petroleum from contaminating surface water.

Question 5

During a toolbox talk on hand-arm vibration, which health condition should workers be warned about as a long-term risk?

Accepted Answer

Hand-Arm Vibration Syndrome (HAVS) including white finger

Answer

HAVS, including vibration-induced white finger, causes permanent damage to blood vessels and nerves in the hands from prolonged tool vibration.

(CITB) Construction Industry Training Board Practice Test

(CITB) Construction Industry Training Board Practice Test

CITB Health, Safety, and Environmental Management 4