CHST FREE Construction Health and Safety Technician MCQ Questions and Answers 4 — Questions and Answers
Question 1: Under OSHA's lead standard for construction (29 CFR 1926.62), the action level (AL) for lead exposure is:
- 25 µg/m³ as an 8-hour TWA (Correct answer)
- 50 µg/m³ as an 8-hour TWA
- 30 µg/m³ as an 8-hour TWA
- 100 µg/m³ as an 8-hour TWA
Correct answer: 25 µg/m³ as an 8-hour TWA
The action level for lead in construction is 25 µg/m³ as an 8-hour time-weighted average, which triggers medical surveillance and monitoring requirements.
Question 2: A contractor is working at heights and must decide between a personal fall arrest system and a positioning device. What is the key functional difference?
- Positioning devices arrest free falls; personal fall arrest systems limit movement
- Personal fall arrest systems stop free falls; positioning devices hold workers in place to work with both hands free (Correct answer)
- Both serve the same function but differ only in anchor strength requirements
- Positioning devices are required above 10 feet; personal fall arrest systems are required above 6 feet
Correct answer: Personal fall arrest systems stop free falls; positioning devices hold workers in place to work with both hands free
A personal fall arrest system (PFAS) stops a worker after a free fall begins, while a positioning device keeps the worker supported hands-free at an elevated work position.
Question 3: Which type of fire extinguisher should be used on energized electrical equipment fires?
- Class A
- Class B
- Class C (Correct answer)
- Class D
Correct answer: Class C
Class C fire extinguishers use non-conductive agents and are rated for use on fires involving energized electrical equipment.
Question 4: During a confined space entry on a construction site, the attendant's PRIMARY role is to:
- Monitor the atmosphere inside the space and enter to assist if conditions worsen
- Keep track of authorized entrants and initiate rescue procedures without entering (Correct answer)
- Operate ventilation equipment to maintain safe oxygen levels
- Perform continuous atmospheric monitoring from inside the space
Correct answer: Keep track of authorized entrants and initiate rescue procedures without entering
The attendant must track entrants and initiate rescue (non-entry rescue or emergency services) but must NOT enter the permit space during an emergency.
Question 5: According to ANSI/ISEA Z89.1, which hard hat class provides the highest level of electrical protection?
- Class G (General)
- Class E (Electrical) (Correct answer)
- Class C (Conductive)
- Class H (High-voltage)
Correct answer: Class E (Electrical)
Class E hard hats are tested to 20,000 volts and provide the highest level of electrical protection under ANSI/ISEA Z89.1.
Question 6: What is the primary purpose of a Safety Data Sheet (SDS) Section 8 (Exposure Controls/Personal Protection)?
- List regulatory exposure limits and recommend appropriate PPE (Correct answer)
- Identify first aid measures for chemical exposure
- Describe physical and chemical properties of the substance
- Provide emergency response telephone numbers
Correct answer: List regulatory exposure limits and recommend appropriate PPE
SDS Section 8 lists OELs (such as OSHA PELs and ACGIH TLVs) and specifies engineering controls and PPE required to minimize worker exposure.
Question 7: A construction company's Experience Modification Rate (EMR) is 1.35. What does this indicate?
- The company's injury costs are 35% below the industry average
- The company's injury costs are 35% above the industry average (Correct answer)
- The company has 35% fewer claims than average
- The company received a 35% premium discount
Correct answer: The company's injury costs are 35% above the industry average
An EMR above 1.0 means the employer's workers' compensation losses exceed the industry average; 1.35 indicates costs are 35% higher than average.
CHST FREE Construction Health and Safety Technician MCQ Questions and Answers 4
Under OSHA's lead standard for construction (29 CFR 1926.62), the action level (AL) for lead exposure is: