MCQ Collection
opra MCQs
Practice opra questions with answers and explanations.
Choose an option to check your answer.
A.
151.3
B.
41.4
C.
99.6
D.
66.1
Show Answer
Correct Answer: D. 66.1
Explanation:
Use fraction remaining=e^(−kt).
Choose an option to check your answer.
A.
A randomised controlled design reduces allocation bias and supports causal inference when well conducted.
B.
Randomisation guarantees zero measurement error.
C.
A case report proves population causality.
D.
Blinding always increases sample size.
Show Answer
Correct Answer: A. A randomised controlled design reduces allocation bias and supports causal inference when well conducted.
Explanation:
A randomised controlled design reduces allocation bias and supports causal inference when well conducted.
Choose an option to check your answer.
A.
It is independent of prevalence.
B.
Positive predictive value depends on disease prevalence as well as test performance.
C.
It is always equal to sensitivity.
D.
It must be 100% when specificity is above 50%.
Show Answer
Correct Answer: B. Positive predictive value depends on disease prevalence as well as test performance.
Explanation:
Positive predictive value depends on disease prevalence as well as test performance.
Choose an option to check your answer.
A.
A depot formulation can prolong drug release and reduce dosing frequency.
B.
It prevents every adverse effect.
C.
It guarantees immediate peak concentration.
D.
It is identical to an intravenous bolus.
Show Answer
Correct Answer: A. A depot formulation can prolong drug release and reduce dosing frequency.
Explanation:
A depot formulation can prolong drug release and reduce dosing frequency.
Choose an option to check your answer.
A.
13.2
B.
114.1
C.
87.6
D.
99.9
Show Answer
Correct Answer: C. 87.6
Explanation:
Use fraction remaining=e^(−kt).
Choose an option to check your answer.
A.
Blinding always increases sample size.
B.
A case report proves population causality.
C.
Randomisation guarantees zero measurement error.
D.
A randomised controlled design reduces allocation bias and supports causal inference when well conducted.
Show Answer
Correct Answer: D. A randomised controlled design reduces allocation bias and supports causal inference when well conducted.
Explanation:
A randomised controlled design reduces allocation bias and supports causal inference when well conducted.
Choose an option to check your answer.
A.
It is independent of prevalence.
B.
It must be 100% when specificity is above 50%.
C.
Positive predictive value depends on disease prevalence as well as test performance.
D.
It is always equal to sensitivity.
Show Answer
Correct Answer: C. Positive predictive value depends on disease prevalence as well as test performance.
Explanation:
Positive predictive value depends on disease prevalence as well as test performance.
Choose an option to check your answer.
A.
A depot formulation can prolong drug release and reduce dosing frequency.
B.
It guarantees immediate peak concentration.
C.
It is identical to an intravenous bolus.
D.
It prevents every adverse effect.
Show Answer
Correct Answer: A. A depot formulation can prolong drug release and reduce dosing frequency.
Explanation:
A depot formulation can prolong drug release and reduce dosing frequency.
Choose an option to check your answer.
A.
0.161
B.
56050
C.
6.21
D.
8.21
Show Answer
Correct Answer: C. 6.21
Explanation:
Concentration=amount/volume.
Choose an option to check your answer.
A.
29.76
B.
49.6
C.
2976.0
D.
0.034
Show Answer
Correct Answer: A. 29.76
Explanation:
Apply AUC=F×Dose/CL.
Choose an option to check your answer.
A.
12.5
B.
50
C.
25
D.
6.25
Show Answer
Correct Answer: A. 12.5
Explanation:
After three half-lives, (1/2)^3=12.5%.
Choose an option to check your answer.
A.
A competitive antagonist usually shifts the agonist concentration–response curve to the right without reducing the maximal response.
B.
It irreversibly increases efficacy.
C.
It removes the need for agonist binding.
D.
It always raises the maximal response.
Show Answer
Correct Answer: A. A competitive antagonist usually shifts the agonist concentration–response curve to the right without reducing the maximal response.
Explanation:
A competitive antagonist usually shifts the agonist concentration–response curve to the right without reducing the maximal response.
