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Railways PYQCBT 2 2017

RRB NTPC · Question 26

The surface area (in sq. cm.) of a sphere with radius 3.5 cm is: (Take \(\pi = \frac{22}{7}\))

  1. 154/7

  2. 154

  3. 54

  4. 54/7

Show answer & explanation

Answer: (B) 154

Explanation

Surface area = 4πr² = 4 × 22/7 × 3.5 × 3.5 = 4 × 22/7 × 12.25 = 154 sq cm.