Nokea
The dose of toxin that is lethal to half of the population is known as..
- A. LD50
- B. L50
- C. D50
- D. LD
Correct Answer: A
Rationale: LD50 refers to the lethal dose required to kill 50% of a population, commonly used in toxicology studies.
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What type of disease is rabies?
- A. Zoonotic
- B. Non-infectious
- C. Vector-borne
- D. Foodborne
Correct Answer: A
Rationale: Rabies is a zoonotic disease transmitted from animals to humans.
validity stands for.
- A. accuracy
- B. reliability
- C. consistency
- D. all
Correct Answer: A
Rationale: Validity refers to how accurately a method measures what it is intended to measure.
What are some possible hazards associated with the organochloride pesticide DDT?
- A. Bioaccumulation and reproductive toxicity.
- B. Immediate skin irritation and respiratory distress.
- C. Increased crop yield and soil fertility.
- D. Improved water quality and biodiversity.
Correct Answer: A
Rationale: DDT bioaccumulates in ecosystems and is linked to reproductive and developmental toxicity in wildlife and humans.
An abstract of the journal article doesn't contain
- A. Methodologies
- B. Result
- C. Objectives
- D. Ethical consideration
Correct Answer: D
Rationale: Abstracts typically summarize the key points of an article, including objectives, methods, results, and conclusions, but do not delve into ethical considerations.
What might explain a sudden increase in disease reports in one county?
- A. An outbreak in the county.
- B. Batch reports.
- C. Duplicate reports.
- D. Increase in the county's population and laboratory error.
Correct Answer: C
Rationale: Duplicate reports inflate the apparent number of cases without reflecting true incidence.