Question 32:The usefulness of a screening test depends upon
its ?
A) Sensitivity
B) Specificity
C) Reliability
D) Predictive value
Ans:A
Question 33:The following is true about the term 'New
Families' ?
A) It is a variant of the 3-generation family
B) It is applied to all nuclear families of less than 10
years duration
C) It is a variant of the joint family
D) It is applied to all nuclear families of less then 2
years duration
Ans:B
Question 34:Residents of three villages with three different
types of water supply were asked to participate in a study to identify cholera
carriers. Because several cholera deaths had occurred in the recent past,
virtually everyone present at the time submitted to the examination. The
proportion of residents in each village who were carriers was computed and
compared. This study is a ?
A) Cross-sectional study
B) Case-control study
C) Concurrent cohort study
D) Non-concurrent
Ans:A
Question 35:In calculating Dependency Ratio, the numerator
is expressed as ?
A) Population under 10 years and 60 and above
B) Population under 15 years and 60 and above
C) Population under 10 years and 65 and above
D) Population under 15 years and 65 and above
Ans:D
Question 36:For testing the statistical significance of the
difference in heights of school children among three socioeconomic groups, the
most appropriate statistical test is ?
A) Students's 't' test
B) Chi-squared test
C) Paired 't' test
D) One way analysis of variance (one way ANOVA)
Ans:D
Question37:An investigator wants to study the association
between maternal intake of iron supplements (Yes or No) and birth weights (in
gms) of newborn babies. He collects relevant data from 100 pregnant women and
their newborns. What statistical test of hypothesis would you advise for the
investigator in this situation ?
A) Chi-square test
B) Unpaired or independent test
C) Analysis of variance
D) Paired t-test
Ans:B
Question 38:A screening test is used in the same way in two
similar populations; but the proportion of false positive results among those
who test positive in the population A is lower than those who test positive in
population B. What is the likely explanation ?
A) The specificity of the test is lower in population A
B) The prevalence of the disease is lower in population A
C) The prevalence of the disease is higher in population A
D) The specificity of the test is higher in population A
Ans:C
Question 39:A drug company is developing a new
pregnancy-test kit for use on an outpatient basis. The company used the
pregnancy test on 100 women who are known to be pregnant. Out of 100 women, 99
showed positive test. Upon using the same test on 100 non-pregnant women, 90
showed negative result. What is the sensitivity of the test ?
A) 90%
B) 99%
C) Average of 90 & 99
D) Cannot be calculated from the given data
Ans:B
