ICMR Practice Quiz

Question 1

In a diagnostic test evaluation, a new ELISA test for an infection is applied to 200 confirmed cases and 300 confirmed non-cases. The test is positive in 170 cases and 45 non-cases. What is the specificity of the test?

Accepted Answer

$85\%$

Question 2

Which of the following is the primary function of reverse transcriptase in retroviruses?

Accepted Answer

Synthesis of DNA from an RNA template

Question 3

Which immunoglobulin class is the predominant antibody in external secretions such as saliva, tears, and intestinal mucus?

Accepted Answer

Secretory IgA

Question 4

A randomized controlled trial reports a risk ratio of $0.72$ with a $95\%$ confidence interval of $0.55$ to $0.94$ for disease occurrence in the intervention group compared with the control group. Which interpretation is most appropriate?

Accepted Answer

The intervention reduces disease risk by $28\%$, and the result is statistically significant at the $5\%$ level

Question 5

In bacterial culture media, which component is commonly used as a solidifying agent because it remains solid at typical incubation temperatures and is not metabolized by most bacteria?

Accepted Answer

Agar

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Practice Quizzes

ICMR Practice Quiz

Cell Structure and Organelles Fundamentals | ICMR