Question : The ratio of the radius of the base and the height of a solid right circular cylinder is 2 : 3. If its volume is 202.125 cm3, then its total surface area is: (Take $\pi=\frac{22}{7}$)
Option 1: 192.5 cm2
Option 2: 154 cm2
Option 3: 168 cm2
Option 4: 115.5 cm2
Correct Answer: 192.5 cm 2
Solution : Given: The ratio of the radius of the base and the height of a solid right circular cylinder is 2 : 3. Let the radius and height be $2x$ and $3x$ respectively. The volume is 202.125 cm 3 . The total surface area of the cylinder = $2\pi r(r+h)$, The volume of the cylinder = $\pi r^2h$, where $r$ and $h$ are the radius and height respectively. ⇒ $\frac{22}{7}\times (2x)^2\times 3x=202.125$ ⇒ $x^3=\frac{202.125\times 7}{22\times 2\times 2\times 3}$ ⇒ $x^3=\frac{0.125\times 49\times 7}{ 2\times 2\times 2}$ ⇒ $x=\frac{0.5\times 7}{ 2}=1.75$ The radius of the cylinder $=2x=2\times 1.75 = 3.5$ cm The height of the cylinder $=3x=3\times 1.75 = 5.25$ cm The total surface area of the cylinder $=2\times\frac{22}{7}\times 3.5\times (3.5+5.25)$ $=2\times\frac{22}{7}\times 3.5 \times 8.75=192.5$ cm 2 Hence, the correct answer is 192.5 cm 2 .
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
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 $\pi=\frac{22}{7}$)
Question : The volume of a solid right circular cone is $600 \pi \;\text{cm}^3$ and the diameter of its base is 30 cm. The total surface area (in cm2) of the cone is:
Question : The radius of the base of a cylinder is 14 cm and its curved surface area is 880 cm2. Its volume (in cm3) is: (Take $\pi=\frac{22}{7}$)
Question : The curved surface area of a right circular cone is $156 \pi$ and the radius of its base is 12 cm. What is the volume of the cone, in cm3?
Question : What is the total surface area of a solid right circular cylinder of radius 7 cm and height 8 cm?$(\pi=\frac{22}{7})$
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile