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Epidemiology MCQ
1. In an epidemiological study, the 1st case which comes to the attention of the investigator is
a) Reference caseb) Index case
c) Primary case
d) Secondary case
2. Blinding can be done to eliminate which type of bias
a) Berksonianb) Recall
c) Confounding
d) Interviewers
3. If incidence is 50 cases out of 1000 population per year and mean duration of disease is 5 year, then prevalence would be
a) 10b) 250
c) 1/10
d) 1/250
4. When a disease spreads from 1 country to another in a short time, it is called
a) Endemicb) Pandemic
c) Epidemic
d) Sporadic
5. No of new caries occurring within one year in a patient is referred to as
a) Caries incidenceb) Caries experience
c) Caries prevalence
d) Caries increment
Answers
1. B
2. D
3. B
4. B
5. A
2. D
3. B
4. B
5. A
Explanations
1. B
Index Case
Person that comes to the attention of public health authoritiesPrimary Case
Person who acquires the disease from an exposureAttack rate
Secondary Case
Person who acquires the disease from an exposure to the primary caseSecondary attack rate
2D
Interviewer’s bias can be eliminated by double blinding.3 B
Prevalence = Incidence × duration Prevalence = 50 × 5 = 250
4 B
5 A
Incidence is the no of new cases of a specific disease occurring in a defined population in a defined population in a specified period of time.
