Allied & ICAR Exam Bank • ALLIED_2266 NAT • 2 Marks

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Ratios & Percentages

Question Statement:

If the diameter of a sphere is decreased by 20%, the percentage decrease in its surface area is:

Answer Key:

36

Step-by-Step Solution & Explanation

Surface area factor $= (0.80)^2 = 0.64$. Decrease $= (1 - 0.64) \times 100 = 36\%$.
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