131 - AIIMS community medicine mcqs or social and preventive medicine mcqs ( spm or psm ) from all previous years AIIMS papers with answers - part 25

121q: most common cause of perinatal mortality in India is ?

a. birth defect
b. prematurity
c. G.I infection
d. Asphyxia

 answer  b . prematurity .

122q: what is false about japanese encephalitis ?

a. pig manifest disease
b. seen in Karnataka
c. man is incidental host
d. extra human reservoir is known

 answer  a . pigs do not manifest the disease , they act as amplifiers of the virus only

123q: denominator in secondary attack rate is ?

a. number of contacts developing disease
b. total number of person developing disease
c. number of contacts developing disease within maximum incubation period
d. total number of susceptible exposed

 answer  d . total number of susceptible exposed .

124q: incidence is calculated by ?

a. retrospective study
b. prospective study
c. cross sectional study
d. random study

 answer  b . prospective study . incidence can be calculated in cohort study which is also known as prospective study . other names of cohort study are longitudinal study , incidence study and forward looking study . 

125q: area between one standard deviation on either side of mean in normal distribution curve is ?

a. 62 %
b. 68 %
c. 90 %
d. 99 %

 answer  b . 68 % . if the question is 2 SD , then it is 95 % and if the question is 3 standard deviations then it is 99 % .