250+ TOP MCQs on Toxicity Assessment and Answers

Hazardous Waste Management Multiple Choice Questions on “Toxicity Assessment”

1. What are the steps involved in evaluation of toxicity?
a) hazard identification and dose-response evaluation
b) chemical analysis
c) pathway analysis
d) evaluation of long term impact
Answer: a
Clarification: Hazard identification includes a description of the specific forms of toxicity and Dose-response evaluation is incidence of specific toxins subjected to population.

2. ___________ establishes the relationship between the contaminant/s of concern and the receptor.
a) Hazard identification
b) Toxicity assessment
c) Risk characterisation
d) Exposure assessment
Answer: b
Clarification: Toxicity assessment is the Characterization of the toxicological properties and effects of a chemical, with special emphasis on establishment of dose-response characteristics.

3. Which of the following is not characteristics of hazardous waste?
a) Toxicity
b) Corrosivity
c) Ignitibility
d) Leakage
Answer: d
Clarification: Toxicity, corrosivity, ignitibility and reactivity are the aspects considered in quantification and characterisation of hazardous waste.

4. What is toxicity equivalence factor?
a) Ratio of the toxicity of a chemical to that of another structurally related chemical (or index compound) chosen as a reference
b) Ratio of the toxicity of a contaminant to that of another structurally related chemical (or index compound) chosen as a reference
c) Ratio of the toxicity of a chemical to that of another chemical pollutant chosen as a reference
d) Ratio of the toxicity of a chemical to that of source
Answer: a
Clarification: Factor used to estimate the toxicity of a complex mixture, commonly a mixture of chlorinated dibenzo-p-dioxins [oxanthrenes], furans, and biphenyls.

5. Toxicity test is the experimental study of the adverse effects of exposure of a living organism to a substance for a defined duration under defined conditions.
a) True
b) False
Answer: a
Clarification: Toxicity testing is conducted to determine the degree to which a substance can damage a living or non-living organisms.

6. Results from long-term exposure to lower doses of a chemical is known as ________
a) Acute toxicity
b) Chronic toxicity
c) Moderate toxicity
d) High toxicity
Answer: b
Clarification: Chronic toxicity is the development of adverse effects as the result of long term exposure to a toxicant or other stressor.

7. _________ is an interpretation tool which enables toxicity of unknown mixtures of chemicals be converted into the concentration of an equivalently toxic reference substance.
a) Toxicity equivalencing
b) Toxicity index
c) Toxicity proportion
d) Toxicity interpretation
Answer: a
Clarification: Toxicity equivalencing tool is used to evaluate the amount of toxicity and estimates the risks of a mixture of structurally related chemicals with a common and same mechanism.

8. Which toxicity test is preferable to determine the acute or chronic toxicity of air, water and wastewater discharges or total pollutant loads?
a) Indirect toxicity test
b) Direct toxicity test
c) Chemical analysis
d) High toxicity test
Answer: b
Clarification: The use of DTA allows an assessment of the toxicity of mixtures of chemicals rather than individual chemicals.

9. What is the main objective of toxicity assessment?
a) To determine source of pathway
b) To determine chemical concentration
c) To estimate how much of a substance does what kind of harm.
d) To analyse chemical exposure