1) What is the surface area of the sphere with radius "2r" cm? A) $4\pi r^{2}$ B) $6\pi r^{2}$ C) $16\pi r^{2}$ D) $32\pi r^{2}$ Answer: Option CExplanation:Surface area of sphere of radius r is $4\pi r^{2}$ When r=2r, Surface area= $4\pi (2r)^{2}=16\pi r^{2}$
