"A water tank open at the top is hemispherical at the bottom and cylindrical above it
Channel: Doubtnut
Date: 2020-04-05

"A water tank
 open at the top is hemispherical at the bottom and cylindrical above it. If
 radius of the hemisphere is 12 m and the total capacity of the tank is `3312pi\ m^3`
, then the
 ratio of the surface areas of the hemispherical and the cylindrical portions
 is
(a) 1 : 1 (b) 3 : 5 (c) 4 : 5 (d) 6 : 5"