Question54:-Which of the following statement is/are correct about disability rates ?
i. Quality Adjusted Life Years (QALY) is a measure of disease burden including both

the quality and quantity of life lived.

ii. Health Adjusted Life Expectancy (HALE) is based on life expectancy at one year

of age.

iii. One DALY is equal to one year of healthy life lost.

A:-Only i and ii

B:-Only i and iii

C:-Only ii and iii

D:-Only iii

Correct Answer:- Option-B

Question55:-Presence of which bacteria among the following is regarded as
important confirmatory evidence of recent fecal pollution of water ?

A:-Faecal streptococci
B:-Cl. perfringens
C:-Klebsiella aerogens
D:-E.coli

Correct Answer:- Option-A

Question56:-Ildentify the true statement/statements.

i. Case control studies do not distinguish between causes and associated factors.
ii. Case control studies generally yields only estimate of relative risk.

iii. Case control studies are inappropriate for rare diseases.

A:-Only i and iii
B:-Only i and ii
C:-Only ii and iii
D:-Only iii
Correct Answer:- Option-B
Question57:-Bradford Hill's criteria for judging causality includes all except
A:-Coherence of association
B:-Consistency of association
C:-Biological plausibility
D:-Sensitivity of association
Correct Answer:- Option-D
Question58:-Disinfection of water by chlorine is an example for
A:-Precurrent disinfection
B:-Concurrent disinfection
C:-Terminal disinfection
D:-Physical disinfection

Correct Answer:- Option-A