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Specificity
(Single Best Answer) Question 1: The relationship between birth rate and maternal hemoglobin is best studied by ?
A) Standard error of difference between two means
B) Standard error of difference between two proportions
C) Correlation and regression
D) senstivity and specificity
Answer (Select an option above to get the answer):
(Single Best Answer) Question 2: If the specificity of the test was 80% and the senstivity remains the same in a population with 50% prevalence , the positive predictive value of the test will be ?
A) 90%
B) 80%
C) 70%
D) 60%
Answer (Select an option above to get the answer):
(Single Best Answer) Question 3: Prevalence of a disease affects ?
A) Senstivity of a test
B) Specificity of a test
C) Positive predictive value of a test
D) Dependability of a test
Answer (Select an option above to get the answer):
(Single Best Answer) Question 4: A diagnostic test for a particular disease has a sensitivity of 0.90 and a specificity of 0.90. A single test is applied to each suject in the population in which the diseased population is 10 %. What is the probability that a person positive to this test, has the disease ?
A) 90 %
B) 81 %
C) 50 %
D) 91 %
Answer (Select an option above to get the answer):
(Single Best Answer) Question 5: Which of the following property of drug will enable it to be used in low concentrations ?
A) High affinity
B) High specificity
C) Low specificity
D) High stability
Answer (Select an option above to get the answer):
(Single Best Answer) Question 6: Side effects of a drug arise due to the interactions of the drug to molecules other than the target. These effects of a drug can be minimized by its high ?
A) Specificity
B) Affinity
C) Solubility
D) Hydrophobicity
Answer (Select an option above to get the answer):
(Single Best Answer) Question 7: In a group of patients presenting to a hospital emergency with abdominal pain, 30% of patients have acute appendicitis, 70% of patients with appendicitis have a temperature greater than 37.5°C and 40% of patients without appendicitis have a temperature greater than 37.5°C. Considering these findings, which of the following statements is correct ?
A) The sensitivity of temperature greater than 37.5°C as a marker for appendicitis is 21/49
B) The specificity of temperature greater than 37.5°C as a marker for appendicitis is 42/70
C) The positive predictive value of temperature greater than 37.5°C as marker for appendicitis is 21/30
D) The specificity of the test will depend upon the prevalence of appendicitis in the population to which it is applied
Answer (Select an option above to get the answer):
(Single Best Answer) Question 8: The usefulness of a screening test depends upon its ?
A) Sensitivity
B) Specificity
C) Reliability
D) Predictive value
Answer (Select an option above to get the answer):
(Single Best Answer) Question 9: A screening test is used in the same way in two similar populations; but the proportion of false positive results among those who test positive in the population A is lower than those who test positive in population B. What is the likely explanation ?
A) The specificity of the test is lower in population A
B) The prevalence of the disease is lower in population A
C) The prevalence of the disease is higher in population A
D) The specificity of the test is higher in population A
Answer (Select an option above to get the answer):
(Single Best Answer) Question 10: The diagnostic power of a test to correctly exclude the disease is reflected by ?
A) Sensitivity
B) Specificity
C) Postivity predictivity
D) Negative predictivity
Answer (Select an option above to get the answer):
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