52. What does the predictive value reflect for a given screen test?
0) The diagnostic power of the screening test
(1) The more prevalent the disease is the more accurate the predictive value
(111) The predictive value depends upon the sensitivity, specificity and disease prevalence
(A) Option (1) and (i) (B) Option (ii) and (iii)
(ಲ) Option (i), (ii) and (iii) (D) Option (i) and (iii)

53. Which of the following features of rash are suggestive of chicken pox infection?
൫ Centripetal
(1) Palms and soles are seldom affected
(iii) Axilla affected
(iv) Rash mostly on flexor surface
(A) Option (1) and (i) (B) Option (i), (ii) and (iii)
(C) Option (i), (iii) and (iv) ൯) Allof the above
54. Which among these is the most frequently used method when a blinded trial is conducted?
(A) Single blinded trial
(B) Double blinded trial
(0) Triple blinded trial
(D) Quadruple blinded trial
55.

For a cross — over type of randomized control trials which of the following is NOT true?

൫ The patient does not serve as his own control
(1) Patients are randomly assigned to a study and control group
(iii) The study group receives the intervention in the first phase

(iv) The control group receives the intervention in the next phase
(A) Only 0) (B) Only Gi)
(C) Only Gii) (D) None of the above

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