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NTPC Graduate Tier 1 2025 Shift-1 📅 06 May, 2025

Find the surface area of a sphere whose diameter is equal to 98 cm.

A
29,256 cm²
B
39,204 cm²
C
30,184 cm²
D
33,284 cm²
Result Summary
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NTPC Graduate Tier 1
2025 • 06 May, 2025 • Shift-1
Find the surface area of a sphere whose diameter is equal to 98 cm.
Correct Answer
30,184 cm²
Identifying Parameters: The problem provides the diameter of the sphere as 98 cm. Consequently, the radius (r) is half of this, which is 49 cm.Formula Applicati......
Ref/Book : NTPC Graduate Tier 1 2025
Ref. Subject Mathematics
Chapter -
Ref. Topic Mensuration
Pg. No -
💡 Analysis & Explanation
Identifying Parameters ▼
The problem provides the diameter of the sphere as 98 cm. Consequently, the radius (r) is half of this, which is 49 cm.
Formula Application ▼
The total surface area of a perfect sphere is calculated using the formula 4πr².
Mathematical Execution ▼
Substituting the values gives 4 × (22/7) × 49 × 49. Simplifying this yields 4 × 22 × 7 × 49 = 88 × 343 = 30,184.
Conclusion ▼
The computed surface area is exactly 30,184 cm².
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