Railways PYQCBT 2 2017

RRB NTPC · Question 115

The surface area (in sq. cm) of a sphere with radius 2 cm is: \(\left(\text{Take} \ \pi = \dfrac{22}{7}\right)\)

  1. 352/7

  2. 350/21

  3. 352/21

  4. 350/7

Show answer & explanation

Answer: (A) 352/7

Explanation

Surface area = 4πr² = 4 × 22/7 × 4 = 352/7 sq cm.