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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The mean weight of a group is 50 kg with a standard deviation of 5 kg. The coefficient of variation is:
सही उत्तर: घ) 10%
Coefficient of variation = SD ÷ mean × 100 = 5 ÷ 50 × 100 = 10%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The standard deviation of haemoglobin in a sample of 100 people is 1.5 g/dL. The standard error of the mean is:
सही उत्तर: ग) 0.15 g/dL
SE = SD ÷ √n = 1.5 ÷ √100 = 1.5 ÷ 10 = 0.15 g/dL.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a normal distribution, approximately what proportion of observations lie within ±1 standard deviation of the mean?
सही उत्तर: ख) 68%
About 68% of values lie within ±1 SD, 95% within ±1.96 (about 2) SD and 99.7% within ±3 SD.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Acute flaccid paralysis surveillance for polio eradication covers children below the age of:
सही उत्तर: क) 15 years
WHO recommends reporting and investigating all cases of AFP in children under 15 years of age (and any suspected polio at any age).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Herd immunity does NOT protect unvaccinated individuals against:
सही उत्तर: ग) Tetanus
Tetanus is acquired from spores in the environment, not from other people, so immunity in others gives no indirect protection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The kappa statistic is used to measure:
सही उत्तर: घ) Agreement between observers beyond that expected by chance
Cohen's kappa quantifies inter- (or intra-) observer agreement for categorical ratings, correcting for chance agreement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a screening test of fixed sensitivity and specificity, as the prevalence of disease in the population increases, the:
सही उत्तर: घ) Positive predictive value increases
Sensitivity and specificity are properties of the test, but predictive values depend on prevalence; higher prevalence raises PPV and lowers NPV.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a screening test with sensitivity 90% and specificity 90%, the positive likelihood ratio is:
सही उत्तर: ग) 9
LR+ = sensitivity ÷ (1 − specificity) = 0.90 ÷ 0.10 = 9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At the analysis stage, confounding can be controlled by:
सही उत्तर: क) Stratification or multivariate analysis
Randomisation, matching and restriction are design-stage methods; stratified analysis and multivariable regression control confounding during analysis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In screening, 'lead time' refers to:
सही उत्तर: ख) The interval between detection by screening and the time diagnosis would usually have been made
Earlier diagnosis by screening adds lead time, which can falsely lengthen apparent survival (lead-time bias) even if death is not postponed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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