MCQ Collection
opra MCQs
Practice opra questions with answers and explanations.
Choose an option to check your answer.
A.
0.1
B.
10.0
C.
1.0
D.
6.0
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Correct Answer: B. 10.0
Explanation:
For a weak acid, [A−]/[HA]=10^(pH−pKa).
Choose an option to check your answer.
A.
Bactericidal agents cannot have resistance.
B.
Bacteriostatic agents always destroy spores.
C.
Bactericidal activity kills susceptible bacteria, whereas bacteriostatic activity inhibits growth.
D.
Both terms mean viral inactivation.
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Correct Answer: C. Bactericidal activity kills susceptible bacteria, whereas bacteriostatic activity inhibits growth.
Explanation:
Bactericidal activity kills susceptible bacteria, whereas bacteriostatic activity inhibits growth.
Choose an option to check your answer.
A.
Phase I always produces an inactive metabolite.
B.
Phase I reactions occur only outside the body.
C.
Phase I reactions commonly introduce or expose functional groups through oxidation, reduction or hydrolysis.
D.
Phase I is limited to renal filtration.
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Correct Answer: C. Phase I reactions commonly introduce or expose functional groups through oxidation, reduction or hydrolysis.
Explanation:
Phase I reactions commonly introduce or expose functional groups through oxidation, reduction or hydrolysis.
Choose an option to check your answer.
A.
131.8
B.
99.7
C.
75.9
D.
27.6
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Correct Answer: C. 75.9
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.
Blinding always increases sample size.
D.
A case report proves population causality.
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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.
8.36
B.
19250
C.
6.36
D.
0.157
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Correct Answer: C. 6.36
Explanation:
Concentration=amount/volume.
Choose an option to check your answer.
A.
32.23
B.
53.71
C.
1579.2
D.
0.031
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Correct Answer: A. 32.23
Explanation:
Apply AUC=F×Dose/CL.
Choose an option to check your answer.
A.
12.5
B.
6.25
C.
50
D.
25
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Correct Answer: A. 12.5
Explanation:
After three half-lives, (1/2)^3=12.5%.
Choose an option to check your answer.
A.
It irreversibly increases efficacy.
B.
It removes the need for agonist binding.
C.
It always raises the maximal response.
D.
A competitive antagonist usually shifts the agonist concentration–response curve to the right without reducing the maximal response.
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Correct Answer: D. 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.
Choose an option to check your answer.
A.
Phase I reactions occur only outside the body.
B.
Phase I is limited to renal filtration.
C.
Phase I reactions commonly introduce or expose functional groups through oxidation, reduction or hydrolysis.
D.
Phase I always produces an inactive metabolite.
Show Answer
Correct Answer: C. Phase I reactions commonly introduce or expose functional groups through oxidation, reduction or hydrolysis.
Explanation:
Phase I reactions commonly introduce or expose functional groups through oxidation, reduction or hydrolysis.
Choose an option to check your answer.
A.
76.8
B.
26.4
C.
99.7
D.
130.2
Show Answer
Correct Answer: A. 76.8
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.
Blinding always increases sample size.
C.
Randomisation guarantees zero measurement error.
D.
A case report proves population causality.
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.
