SarkariPYQ

SSC CHSL 2022 PYQ — Question 73

SSC CHSL - 30 May 2022 - Shift 1 • Quantitative Aptitude • Q73

Back to paper

Find the surface area of a sphere of diameter 21 cm. (Use (π=227)(\pi=\frac{22}{7})

Show answer & explanation

Correct answer: D

Explanation

The correct answer is option 4 i.e. 1386 cm2

Given:

diameter = 21 cm

Formula used:

Total surface area of sphere = 4πr2          ---- (1)

Calculations:

Radius = 21/2 = 10.5 cm

Using equation (1), we get

⇒ Total surface area of sphere = 4 × (22/7) × 10.5 × 10.5 = 1386 cm2