C:-No inference can be made about the comparative age of the population
from this data.

D:-The population of Community Y is on an average older than that of
Community X.

Correct Answer:- Option-B

Question5:-A spot mam is particularly useful for displaying
A:-Incidence rate of disease by area
B:-Prevalence rate of disease by area
C:-Geographic location of exposure of each case patient
D:-All of the above
Correct Answer:-Question Cancelled

Question6:-A number of epodemiological studies have shown that among Indian's
impaired glucose tolerance, high blood pressure and deranged lipid profile greatly
increase the risk of ischemic heart disease. Which of the following uses of
Epidemiology does the findings relate to?

A:-ldentifying causes of a disease
B:-Studying of historic rise of a disease
C:-Planning of health services
D:-Identification of syndromes
Correct Answer:- Option-A
Question7:-Positive predictive value of a screening test is
A:-Ability to correctly call all those who actually have the disease.
B:-Probability of actually having the disease if the screening test is positive.

C:-Probability of actually not having the disease if the screening test is
negative.

D:-Ability to correctly identify the negatives as those who really do not have
the disease.

Correct Answer:- Option-B

Question8:-In assessing the validity of a screening test, those subjects who test
positive with the screening test but test negative by the gold standard tests are
called

A:-True positive

B:-True negatives

C:-False positives

D:-False negatives
Correct Answer:- Option-C

Question9:-In a trial of Dengue vaccine the trial vaccine was given to 1000 children
while another 1000 children were given placebo only. Over the next one year, there
were 200 and 800 cases of dengue among children given the vaccine and not given
the vaccine respectively. Calculate the vaccine efficacy.