Nokea
Vibrio cholera are destroyed by all except
- A. boiling
- B. drying
- C. bleaching powder(1 mg/lit.)
- D. cresol
Correct Answer: D
Rationale: Cresol is not effective against Vibrio cholerae, while boiling, drying, and bleaching powder are effective methods for destroying the bacteria.
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Establishment of DDA in
- A. 1979
- B. 1989
- C. 1979
- D. 1986
Correct Answer: A
Rationale: The Department of Drug Administration (DDA) was established in 1979.
Define the following terms: latency
- A. The time between exposure to a hazard and the onset of symptoms.
- B. The strength of a chemical bond.
- C. The period during which a disease is contagious.
- D. The duration of a clinical trial.
Correct Answer: A
Rationale: Latency refers to the delay between exposure to a harmful agent and the manifestation of health effects.
Discuss the possible health effects that have been associated with exposure to electric and magnetic fields and ionizing radiation.
- A. EMF: unclear evidence; Ionizing: cancer risk.
- B. EMF: immediate death; Ionizing: no known risks.
- C. EMF: improved sleep; Ionizing: enhanced mood.
- D. EMF: faster metabolism; Ionizing: increased energy.
Correct Answer: A
Rationale: Evidence linking EMFs to health effects is inconclusive, while ionizing radiation is a well-established carcinogen.
Which of the following is the strength of Case control study?
- A. rare disease
- B. bias can be minimized
- C. temporal relationship can be established
- D. relative risk can be calculated
Correct Answer: A
Rationale: Case-control studies are particularly useful for studying rare diseases.
Surgeons at hospital A report that the mortality rate at the end of a 1-year follow-up after a new coronary bypass procedure is 15%. At hospital B, the surgeons report a 1-year mortality rate of 8% after the same procedure. Before concluding that the surgeons at hospital B had vastly superior skill, which of the following possible confounding factors would you examine?
- A. The severity(stage) of disease of the patients at the two hospitals at baseline.
- B. The start of the one-year follow-up at both hospitals(after operation versus after discharge).
- C. Differences in postoperative care at the two hospitals.
- D. Equality of follow-up for mortality.
Correct Answer: D
Rationale: All listed factors (a-d) could contribute to differences in mortality rates, making 'all of the above' the most comprehensive answer. Since we shift 'E' options to 'D', D is correct.