GATE 2011 CS (CS1) – Question 7

General Aptitude · Quantitative Aptitude: Data Interpretation, Arithmetic and Number Computation · 2 marks · Multiple choice

The chart shows four microbes. Circle diameter in parentheses represents growth of a surviving microbe within 24 hours. Danger is proportional to toxicity, potency and growth, with growth measured by circle AREA. Which microbe should a vaccine target first?

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Correct answer: (D) S

Explanation

The chart’s toxicity coordinate measures the microbe mass needed to destroy half the body mass, so smaller values mean greater danger. Circle area, and hence growth, is proportional to squared diameter. Up to a common factor, compare growth×potency/toxicity: P=1.25,Q≈1.333,R=1.2,S=1.6. Therefore S, D, is most dangerous.

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