RRB Group-D Model Paper 17 with answers for online practice

Curved surface area of a hemisphere = 27.72 sq cm
⇒ $2\mathit{\pi }{\mathit{r}}^2$ = 27.72
Volume of a hemisphere = 19.404 cubic cm
⇒ $2\mathit{\pi }\frac{{\mathit{r}}^3}{3}$ = 19.404
⇒ 27.72 × r/3 = 19.404
⇒ r = 2.1 cm
∴ Radius = 2.1 cm