Question : A sphere is of radius 5 cm. What is the surface area of the sphere?
Option 1: $100 \pi \;\mathrm{cm^2}$
Option 2: $150 \pi \;\mathrm{cm^2}$
Option 3: $200 \pi\;\mathrm{cm^2}$
Option 4: $120 \pi\;\mathrm{cm^2}$
Correct Answer: $100 \pi \;\mathrm{cm^2}$
Solution : The surface area $A$ of a sphere where $r$ is the radius of the sphere. $A = 4 \pi r^2$ Substituting $r$ = 5 cm into the formula gives: $A = 4 \pi (5)^2 = 100 \pi \, \text{cm}^2$ Hence, the correct answer is $100 \pi \, \text{cm}^2$.
Answer Key | Eligibility | Application | Selection Process | Result | Cutoff | Admit Card
Question : The height and curved surface area of a right circular cylinder are $7~\text{cm}$ and $70\pi~\text{cm}^2$. Its total surface area is:
Question : When the radius of a sphere is increased by 5 cm, its surface area increases by 704 cm2. The diameter of the original sphere is _________. (Take $\pi=22 / 7$ )
Question : The radius of the base of a solid right circular cone is 8 cm and its height is 15 cm. The total surface area of the cone is:
Question : The total surface area of a cone whose radius is 3 cm and height is 4 cm is:
Question : What will be the difference between the total surface area and the curved surface area of a hemisphere having a 4 cm diameter in cm2?
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile