AIEHS Certified Chief Chemical Safety Toxicology
Officer CCCTO Exam
**Question 1. Which OSHA standard specifically requires a written Process Safety Management
(PSM) program for facilities handling highly hazardous chemicals?**
A) 29 CFR 1910.1200
B) 29 CFR 1910.119
C) 29 CFR 1910.1000
D) 29 CFR 1910.134
**Answer: B**
**Explanation:** OSHA’s PSM standard is codified at 29 CFR 1910.119 and mandates a written
safety program for processes using chemicals above threshold quantities.
**Question 2. Under the EU REACH regulation, which of the following is NOT a mandatory
component of a chemical registration dossier?**
A) Chemical safety report
B) Substance identity and properties
C) Market price forecast
D) Exposure scenario
**Answer: C**
**Explanation:** REACH requires identity, properties, safety report, and exposure scenarios;
market price forecasts are irrelevant.
**Question 3. The Globally Harmonized System (GHS) classifies a chemical as “Acute Toxicity –
Category 2” based on which LD₅₀ range for oral exposure in rats?**
A) >5 g/kg
B) 0.5–5 g/kg
C) 0.05–0.5 g/kg
D) ≤0.05 g/kg
**Answer: C**
,AIEHS Certified Chief Chemical Safety Toxicology
Officer CCCTO Exam
**Explanation:** GHS Category 2 acute toxicity corresponds to an oral LD₅₀ of 0.05–0.5 g/kg in
rats.
**Question 4. Which ISO standard integrates occupational health and safety management with
environmental management, facilitating chemical safety integration?**
A) ISO 9001
B) ISO 14001
C) ISO 45001
D) ISO 50001
**Answer: C**
**Explanation:** ISO 45001 specifies occupational health and safety management, and can be
integrated with ISO 14001 for chemical safety.
**Question 5. In toxicokinetics, the term “first‑pass metabolism” refers to metabolism that
occurs primarily in which organ?**
A) Kidney
B) Lung
C) Liver
D) Skin
**Answer: C**
**Explanation:** First‑pass metabolism describes the hepatic (liver) biotransformation of orally
absorbed chemicals before systemic circulation.
**Question 6. The NOAEL (No‑Observed‑Adverse‑Effect Level) is used to derive which
occupational exposure limit?**
A) TLV‑TWA
B) OSHA PEL
,AIEHS Certified Chief Chemical Safety Toxicology
Officer CCCTO Exam
C) ACGIH BEI
D) All of the above
**Answer: D**
**Explanation:** NOAEL data inform the derivation of TLVs, OSHA PELs, and ACGIH BEIs, among
other limits.
**Question 7. Which endpoint is assessed by the Ames test?**
A) Carcinogenicity
B) Mutagenicity
C) Reproductive toxicity
D) Acute toxicity
**Answer: B**
**Explanation:** The Ames test detects mutagenic potential using Salmonella strains.
**Question 8. A chemical that interferes with estrogen receptors is classified as a:**
A) Neurotoxin
B) Endocrine disruptor
C) Respiratory irritant
D) Sensitizer
**Answer: B**
**Explanation:** Substances that alter hormonal signaling, such as estrogen receptors, are
endocrine disruptors.
**Question 9. When calculating a Time‑Weighted Average (TWA) exposure for an 8‑hour shift,
which formula is correct?**
A) Σ(Ci × Ti) / ΣTi
, AIEHS Certified Chief Chemical Safety Toxicology
Officer CCCTO Exam
B) Σ(Ci + Ti) / 8
C) Σ(Ci) / ΣTi
D) Σ(Ci × Ti) / 8
**Answer: A**
**Explanation:** TWA = Σ (concentration × time) ÷ total sampling time.
**Question 10. Which of the following is a short‑term exposure limit (STEL) for a highly volatile
solvent?**
A) 1 ppm for 15 min
B) 5 ppm for 30 min
C) 10 ppm for 15 min
D) 50 ppm for 8 h
**Answer: C**
**Explanation:** STELs are expressed as concentrations permissible for 15 minutes; 10 ppm for
15 min is a typical STEL for solvents like toluene.
**Question 11. In a Safety Data Sheet (SDS) Section 2, what information is required?**
A) Hazard identification
B) Composition/information on ingredients
C) First‑aid measures
D) Ecological information
**Answer: B**
**Explanation:** SDS Section 2 provides the chemical identity and concentration of hazardous
components.
Officer CCCTO Exam
**Question 1. Which OSHA standard specifically requires a written Process Safety Management
(PSM) program for facilities handling highly hazardous chemicals?**
A) 29 CFR 1910.1200
B) 29 CFR 1910.119
C) 29 CFR 1910.1000
D) 29 CFR 1910.134
**Answer: B**
**Explanation:** OSHA’s PSM standard is codified at 29 CFR 1910.119 and mandates a written
safety program for processes using chemicals above threshold quantities.
**Question 2. Under the EU REACH regulation, which of the following is NOT a mandatory
component of a chemical registration dossier?**
A) Chemical safety report
B) Substance identity and properties
C) Market price forecast
D) Exposure scenario
**Answer: C**
**Explanation:** REACH requires identity, properties, safety report, and exposure scenarios;
market price forecasts are irrelevant.
**Question 3. The Globally Harmonized System (GHS) classifies a chemical as “Acute Toxicity –
Category 2” based on which LD₅₀ range for oral exposure in rats?**
A) >5 g/kg
B) 0.5–5 g/kg
C) 0.05–0.5 g/kg
D) ≤0.05 g/kg
**Answer: C**
,AIEHS Certified Chief Chemical Safety Toxicology
Officer CCCTO Exam
**Explanation:** GHS Category 2 acute toxicity corresponds to an oral LD₅₀ of 0.05–0.5 g/kg in
rats.
**Question 4. Which ISO standard integrates occupational health and safety management with
environmental management, facilitating chemical safety integration?**
A) ISO 9001
B) ISO 14001
C) ISO 45001
D) ISO 50001
**Answer: C**
**Explanation:** ISO 45001 specifies occupational health and safety management, and can be
integrated with ISO 14001 for chemical safety.
**Question 5. In toxicokinetics, the term “first‑pass metabolism” refers to metabolism that
occurs primarily in which organ?**
A) Kidney
B) Lung
C) Liver
D) Skin
**Answer: C**
**Explanation:** First‑pass metabolism describes the hepatic (liver) biotransformation of orally
absorbed chemicals before systemic circulation.
**Question 6. The NOAEL (No‑Observed‑Adverse‑Effect Level) is used to derive which
occupational exposure limit?**
A) TLV‑TWA
B) OSHA PEL
,AIEHS Certified Chief Chemical Safety Toxicology
Officer CCCTO Exam
C) ACGIH BEI
D) All of the above
**Answer: D**
**Explanation:** NOAEL data inform the derivation of TLVs, OSHA PELs, and ACGIH BEIs, among
other limits.
**Question 7. Which endpoint is assessed by the Ames test?**
A) Carcinogenicity
B) Mutagenicity
C) Reproductive toxicity
D) Acute toxicity
**Answer: B**
**Explanation:** The Ames test detects mutagenic potential using Salmonella strains.
**Question 8. A chemical that interferes with estrogen receptors is classified as a:**
A) Neurotoxin
B) Endocrine disruptor
C) Respiratory irritant
D) Sensitizer
**Answer: B**
**Explanation:** Substances that alter hormonal signaling, such as estrogen receptors, are
endocrine disruptors.
**Question 9. When calculating a Time‑Weighted Average (TWA) exposure for an 8‑hour shift,
which formula is correct?**
A) Σ(Ci × Ti) / ΣTi
, AIEHS Certified Chief Chemical Safety Toxicology
Officer CCCTO Exam
B) Σ(Ci + Ti) / 8
C) Σ(Ci) / ΣTi
D) Σ(Ci × Ti) / 8
**Answer: A**
**Explanation:** TWA = Σ (concentration × time) ÷ total sampling time.
**Question 10. Which of the following is a short‑term exposure limit (STEL) for a highly volatile
solvent?**
A) 1 ppm for 15 min
B) 5 ppm for 30 min
C) 10 ppm for 15 min
D) 50 ppm for 8 h
**Answer: C**
**Explanation:** STELs are expressed as concentrations permissible for 15 minutes; 10 ppm for
15 min is a typical STEL for solvents like toluene.
**Question 11. In a Safety Data Sheet (SDS) Section 2, what information is required?**
A) Hazard identification
B) Composition/information on ingredients
C) First‑aid measures
D) Ecological information
**Answer: B**
**Explanation:** SDS Section 2 provides the chemical identity and concentration of hazardous
components.
