T.S.A of a Hemisphere

Q. if the total surface area of the hemisphere is $27\pi c{m}^2$, then its radius is

1. 27 cm
2. 3 cm
3. 9 cm

Q.

Question 3
Find the total surface area of a hemisphere of radius 10 cm.
$[Use\pi =3.14]$

Q. The ratio of the total surface area of a sphere and a hemisphere of same radius is

Q. What's the radius of the hemisphere if the total surface area of the hemisphere is $27\pi c{m}^2$?

1. 9 cm
2. 12 cm
3. 3 cm
4. 27 cm

Q.

What is the total surface area of a closed hemisphere?

1. 4$\pi$$r^2$

2. 2$\pi$$r^2$

3. $\frac{4}{3}$$\pi$$r^2$

4. 3$\pi$$r^2$

Q. What is the ratio of the total surface area of a sphere to that of a hemisphere if they have the same radius?

1. $4:3$
2. $3:4$
3. $2:3$
4. $3:2$

Q.

What is the total surface area of a hemisphere?

1. 2$\pi$$r^2$

2. 4$\pi$$r^2$

3. $\frac{4}{3}$$\pi$$r^2$

4. 3$\pi$$r^2$

Q. What's the ratio between the total surface areas of the 2 hemispheres if $\frac{r_1}{r_2}=\frac{1}{2}$?

1. $\frac{1}{8}$
2. $\frac{8}{1}$
3. $\frac{1}{4}$
4. $\frac{4}{1}$

Q. What's the ratio between the total surface areas of the 2 hemispheres if $\frac{r_1}{r_2}=\frac{1}{2}$?

1. $\frac{1}{8}$
2. $\frac{8}{1}$
3. $\frac{1}{4}$
4. $\frac{4}{1}$

Q.

The radius of a hemisphere having total surface area of 1848 sq. cm is 7 cm.

1. True

2. False

Q.

What is the total surface area of a hemisphere?

1. 4$\pi$$r^2$

2. 3$\pi$$r^2$

3. 2$\pi$$r^2$

4. $\frac{4}{3}$$\pi$$r^2$

Q. If the radius of a hemisphere is $2x$, then its total surface area is given by:

1. 
   $3\pi$$x^2$
2. 
   $6\pi$$x^2$
3. 
   $9\pi$$x^2$
4. 
   $12\pi$$x^2$

Q. What is the ratio of the flat surface area and curved surface area of a solid hemisphere?

1. 3 : 1
2. 2 : 1
3. 1 : 2
4. 1 : 3

Q.

A sphere and a hemisphere have same total surface area. Find the ratio of their radii i.e.$\frac{r_1}{r_2}$, where $r_1$ and $r_2$ are the radii of sphere and hemisphere respectively.

1. $\frac{3}{2}$

2. $\frac{\sqrt{3}}{4}$

3. 1

4. $\frac{\sqrt{3}}{2}$

Q. For a sphere and hemisphere of radius 'r', match the following.

1. 4πr${}^2$
2. 3πr${}^2$
3. 2πr${}^2$

Q.

What is the total surface area of a closed hemisphere?

1. 4$\pi$$r^2$

2. 2$\pi$$r^2$

3. $\frac{4}{3}$$\pi$$r^2$

4. 3$\pi$$r^2$