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  9. Q311

RRB NTPC 2025 · Question 311 of 409

A solid metallic sphere of radius 10 cm is melted and recast into 125 identical spheres. What is the ratio of the surface area of the original sphere to the total surface area of 6 smaller spheres so formed?

  1. A25 : 6
  2. B109 : 84Correct
  3. C25 : 96
  4. D49 : 108

Answer: B. 109 : 84

Official answer key verified. Detailed explanation coming soon.

Source: RRB NTPC Graduate CBT-1 response sheet 05-Jun-2025 Shift-3 (candidate-shared copy of official answer-key viewing) · official-answer-key

← Q310View full paper (409 questions)Q312 →

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