सामुदायिक चिकित्सा – Community Medicine MCQ
सामुदायिक चिकित्सा – MD/MS प्रवेश
Community Medicine · MECEE-PG – MD/MS/MDS Entrance · ४१० प्रश्न
४१० प्रश्न उपलब्ध। मोड छान्नुहोस्:
सामुदायिक चिकित्सा: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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In a family of 6, one person is the primary case of measles and one other member is already immune. Two further members develop measles within the incubation period. The secondary attack rate is:
सही उत्तर: ग) 50%
Susceptible contacts = 6 − 1 (primary case) − 1 (immune) = 4; SAR = 2/4 = 50%. Using 6 or 5 as denominator is wrong because the primary case and immune persons are excluded.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the basic reproduction number (R0) of an infection is 4, the minimum proportion of the population that must be immune to interrupt transmission (herd immunity threshold) is:
सही उत्तर: ख) 75%
Herd immunity threshold = 1 − 1/R0 = 1 − 1/4 = 0.75, i.e. 75%. 25% is simply 1/R0, a common slip.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The usual incubation period of measles (exposure to onset of fever) is about:
सही उत्तर: क) 10 days
Measles has an incubation period of about 10 days to the onset of fever and about 14 days to the appearance of rash. A 21-day period is more typical of the upper range for varicella, not measles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A town of 50,000 people records 1,200 live births in a year. Its crude birth rate is:
सही उत्तर: क) 24 per 1000 population
CBR = 1200/50000 × 1000 = 24 per 1000 population.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Relative risk can be calculated directly from which study design?
सही उत्तर: घ) Cohort study
Cohort studies measure incidence in exposed and unexposed groups, giving relative risk directly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Most vaccines at health facility level should be stored at a temperature of:
सही उत्तर: ग) +2 °C to +8 °C
The standard cold-chain range for vaccine storage in refrigerators is +2 °C to +8 °C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A screening test gives TP = 90, FN = 10, FP = 20 and TN = 180. The specificity of the test is:
सही उत्तर: ख) 90%
Specificity = TN/(TN + FP) = 180/200 = 90%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sensitivity of a screening test is calculated as:
सही उत्तर: क) TP / (TP + FN)
Sensitivity is the proportion of truly diseased people correctly identified by the test.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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BCG vaccine is administered by which route?
सही उत्तर: घ) Intradermal
BCG is given intradermally, usually over the left upper arm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The recommended free residual chlorine in drinking water after a contact period of one hour is:
सही उत्तर: ग) 0.5 mg/L
A free residual chlorine of 0.5 mg/L after one hour of contact is the accepted standard.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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