146 - AIIMS community medicine mcqs or social and preventive medicine mcqs ( spm or psm ) from all previous years AIIMS papers with answers - part 39

196q: chlorine demand is measured by ?

a. horrock’s apparatus
b. chlorimeter
c. double pot
d. berkfeld filter

 answer  a . horrock’s apparatus .

197q: in a study in UK they found an association between sale of asthmatic drugs and an increase in deaths due to asthma from 1979 to 1990 . this is an example of ?

a. ecological study
b. cohort study
c. case reference study
d. experimental study

 answer  a . ecological study .

198q: a newly found technique for estimating Hb found the values as 9.4, 9.0, 9.3, 12.4, 9.2, ………. 10.3 and 12.2 . by calorimetry the Hb was estimated to be 10.2 gram percent . so the new test has ?

a. low validity and high reliability
b. high validity and high reliability
c. low validity and low reliability
d. high validity and low reliability

 answer  c . low validity and low reliability .

199q: problem village is all except ?

a. distance of safe water is greater than 1.6 kilometer
b. depth is more than 16 metres
c. waer is polluted with inorganic substance
d. water infested with guinea worm

 answer  d . a problem village is defined as one where no source of safe water is available within a distance of 1.6 km or where water is available at a depth of more than 15 metres or where water source has excess salinity, iron , fluorides and other toxic elements or where water is exposed to the risk of cholera .d. water bottle heart

200q: best method used to find the difference between a newly found test and gold standard test ?

a. correlation study
b. regression study
c. bland and altman analysis
d. none

 answer  c . bland and altman analysis .