Practice Questions

135. A clinical researcher wants to conduct a study where the participants are unaware of their treatment assignment, but the research team is aware. What epidemiological technique is being used?

A. Double-blinding.

B. Triple-blinding.

C. Single-blinding. ✓

D. Open-label.

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Jun 6, 2026

134. A study on vaccine effectiveness reports a significant reduction in disease, but the control group (unvaccinated) was much healthier and less exposed to the disease overall. What critical type of bias is likely present?

A. Information bias.

B. Selection bias. ✓

C. Observer bias.

D. Confounding.

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Jun 6, 2026

133. A pharmaceutical company is conducting research on a drug in animal models before human testing. What medicinal phase of drug development is this?

A. Pre-clinical. ✓

B. Phase I.

C. Phase II.

D. Phase III.

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mintcream-chough-797767.hostingersite.com BS Nursing

Jun 6, 2026

132. What technical term describes a disease that occurs infrequently and irregularly in a population?

A. Endemic.

B. Epidemic.

C. Pandemic.

D. Sporadic. ✓

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Jun 6, 2026

131. A patient presents with a highly unusual combination of symptoms that could indicate a novel infectious disease. What is the urgent clinical responsibility from an epidemiological perspective?

A. Wait for a definitive diagnosis before informing anyone.

B. Immediately isolate the patient, collect samples, and notify the local infectious disease control unit. ✓

C. Treat symptomatically and discharge.

D. Refer to a general practitioner for routine follow-up.

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Jun 6, 2026

130. In clinical screening programs, a low Negative Predictive Value (NPV) means what for the patient?

A. Many false positive results.

B. Many false negative results, potentially leading to missed diagnoses. ✓

C. Accurate diagnosis immediately.

D. No need for further testing.

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Jun 6, 2026

129. A study reports a strong association between exposure to a childhood viral infection and an adult autoimmune disease, but the study design is retrospective. What critical type of bias might affect this study?

A. Observer bias.

B. Recall bias. ✓

C. Selection bias.

D. Confounding.

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Jun 6, 2026

128. A new medicinal pain relief cream is being tested. What technical measure of effect quantifies the difference in the rate of adverse events between the treated group and the placebo group?

A. Relative Risk.

B. Odds Ratio.

C. Absolute Risk Reduction (ARR).

D. Number Needed to Harm (NNH). ✓

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Jun 6, 2026

127. What technical term describes a factor that is associated with both the exposure and the outcome, distorting the true relationship between them?

A. Bias.

B. Random error.

C. Confounder. ✓

D. Effect modifier.

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Jun 6, 2026

126. A local water utility reports contamination with a harmful bacteria, leading to a surge in gastrointestinal illnesses. What is the urgent public health action?

A. Advise people to boil water before use.

B. Issue an immediate "boil water" advisory, identify affected areas, and coordinate with healthcare providers for case management. ✓

C. Wait for lab confirmation from every affected individual.

D. Only provide bottled water to a few households.

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Jun 6, 2026

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Practice Questions

135. A clinical researcher wants to conduct a study where the participants are unaware of their treatment assignment, but the research team is aware. What epidemiological technique is being used?

134. A study on vaccine effectiveness reports a significant reduction in disease, but the control group (unvaccinated) was much healthier and less exposed to the disease overall. What critical type of bias is likely present?

133. A pharmaceutical company is conducting research on a drug in animal models before human testing. What medicinal phase of drug development is this?

132. What technical term describes a disease that occurs infrequently and irregularly in a population?

131. A patient presents with a highly unusual combination of symptoms that could indicate a novel infectious disease. What is the urgent clinical responsibility from an epidemiological perspective?

130. In clinical screening programs, a low Negative Predictive Value (NPV) means what for the patient?

129. A study reports a strong association between exposure to a childhood viral infection and an adult autoimmune disease, but the study design is retrospective. What critical type of bias might affect this study?

128. A new medicinal pain relief cream is being tested. What technical measure of effect quantifies the difference in the rate of adverse events between the treated group and the placebo group?

127. What technical term describes a factor that is associated with both the exposure and the outcome, distorting the true relationship between them?

126. A local water utility reports contamination with a harmful bacteria, leading to a surge in gastrointestinal illnesses. What is the urgent public health action?

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