Question : The total surface area of a right circular cylinder is 1848 cm2. The ratio of its total surface area to the curved surface area is 3 : 1. The volume of the cylinder is: (Take $\pi=\frac{22}{7}$)
Option 1: 4312 cm3
Option 2: 3696 cm3
Option 3: 4002 cm3
Option 4: 4851 cm3
Correct Answer: 4312 cm 3
Solution : Let the radius of the base of the cylinder as $r$ and the height of the cylinder as $h$. The total surface area (TSA) of a right circular cylinder is, $⇒\text{TSA} = 2\pi r(r + h)$ The curved surface area (CSA) of a right circular cylinder is, $⇒\text{CSA} = 2\pi rh$ Given that the ratio of TSA to CSA is 3 : 1. $⇒\frac{\text{TSA}}{\text{CSA}} = \frac{2\pi r(r + h)}{2\pi rh} = \frac{3}{1}$ $⇒\frac{r + h}{h} = \frac{3}{1}$ $⇒r = 2h$ $\text{TSA} = 2\pi r(r + h) = 1848$ Substituting $\pi = \frac{22}{7}$, $⇒2\times\frac{22}{7}\times r(r + \frac{r}{2}) = 1848$ $⇒2\times\frac{22}{7}\times r( \frac{3r}{2}) = 1848$ $⇒r^2=7\times7\times4$ $⇒r=14$ $⇒h=\frac{r}{2}=7$ cm The volume ($V$) of a right circular cylinder is, $⇒V = \pi r^2 h$ $⇒V = \frac{22}{7} \times(14)^2\times 7$ $⇒V = 4312$ cm 3 Hence, the correct answer is 4312 cm 3 .
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