Question

The ratio of the total surface area of a sphere and a hemisphere of same radius is

Answer 1

Total surface area of a sphere $=4\pi r^2$
And total surface area of a hemisphere $=3\pi r^2$
$\text{Ratio}=4\pi r^2:3\pi r^2=4:3$
Hence, option $\left(d\right)$ is correct.