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Define the following terms: Experimental study
- A. A planned intervention where the investigator controls exposure to determine its effect.
- B. A study that uses historical data to analyze outcomes.
- C. A study conducted without a control group.
- D. A study where participants choose their own exposure.
Correct Answer: A
Rationale: An experimental study is characterized by the investigator's control over exposure.
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Describe the significance for epidemiology of the use of vital statistics.
- A. Vital statistics provide data on births and deaths.
- B. Vital statistics are irrelevant to epidemiology.
- C. Vital statistics are used only for economic analysis.
- D. Vital statistics focus solely on infectious diseases.
Correct Answer: A
Rationale: Vital statistics help track population health trends and identify outbreaks or patterns.
The LD50 of highly toxic substance is.... mg/ kg.
- A. less than 1
- B. Jan-50
- C. 51-500
- D. 50-500
Correct Answer: A
Rationale: Highly toxic substances have an LD50 value of less than 1 mg/kg, indicating extreme toxicity.
Which method is suitable for teaching mother group about preparation of superflour:
- A. demonstration
- B. group discussion
- C. roleplaying
- D. exhibition
Correct Answer: A
Rationale: Demonstration is an effective method for teaching practical skills such as preparing superflour.
Acid rain due to
- A. SO2
- B. H2SO4
- C. HCL
- D. b. and c
Correct Answer: D
Rationale: Acid rain forms primarily from sulfur dioxide (SO2) and nitrogen oxides reacting with water vapor.
What is the primary reason for preparing and distributing surveillance summaries?
- A. Document recent epidemiologic investigations.
- B. Provide timely information on disease patterns and trends to those who need to know it.
- C. Provide reprints of MMWR articles, reports, and recommendations.
- D. Acknowledge the contributions of those who submitted case reports.
Correct Answer: B
Rationale: Summaries aim to inform relevant stakeholders quickly about emerging trends and patterns.