206q: the experiment study for which most accurate result is obtained
a. randomized CT with double blinding
b. retrospective cohort study
c. cross sectional study
d. meta analysis
207q: any loss or abnormality of psychological , physiological or anatomical structure or function is ?
a. impairment
b. disability
c. handicap
d. disease
208q: a data is arranged as satisfied , very satisfied , dissatisfied . this is a ?
a. nominal data
b. ordinal data
c. interval data
d. ratio
209q: all can be incenirated except ?
a. cytotoxic waste
b. sharps
c. anatomical waste
d. infectious waste
210q: herd immunity all are true except ?
a. herd structure is constant
b. it is mostly due to subclinical infection
c. can be aquired by immunization
d. spread of epidemic is influenced by it
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