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Railways PYQCBT 2 2017

RRB NTPC · Question 98

The surface area (in sq.cm.) of a sphere with radius 1.5 cm is: (Take \(\pi = \frac{22}{7}\))

  1. 190/21

  2. 190/7

  3. 198/7

  4. 198/21

Show answer & explanation

Answer: (C) 198/7

Explanation

Surface area = 4πr² = 4 × 22/7 × 1.5 × 1.5 = 4 × 22/7 × 2.25 = 198/7 sq cm.