Sphere and Its Surface Area

Q.

Ram has a semicircular disc. He rotates it about its diameter by 360 degrees. When he rotates the disc, a volume of air in his room gets swept. What is the name of the object/shape that exactly occupies this volume?

1. Cylinder

2. Hemisphere

3. Cuboid

4. Sphere

Q. the ratio of volumes of two spheres is 64:8. find the ratio of their surface areas.

Q. If the volume and surface area of the sphere is numerically equal, then its radius is :

1. $2units$
2. $3units$
3. $4units$
4. $5units$

Q. If the ratio of volume Is the ratio of volume of two spheres is 1 ratio 8 find ratio of their surface area If the ratio of volumes of two sphere is 1 ratio 8 find ratio of their surface areas

Q. find the total surface area of a hemisphere with radius as 3 cm​

Q. The volume of two spheres are in the ratio 64:27. Find the ratio of their radii.

Q. The curved surface area of a hemisphere is 77 cm2. Radius of the hemisphere is?

Q. Find TSA of hemispher of radius 7cm.

Q. The radii of two spheres are in the ratio 2:3 find the ratio of their surface areas and ratio of their volumes.

Q. If the radius of the sphere is doubled, Find the ratio of volume of the new sphere to the original sphere.

Q.

if the radius of a sphere is halved then what is the ratio of the volume of the actual sphere to the volume of the new sphere.

Q. If the ratio of the volumes of two spheres is $8:27$, then the ratio of their surface areas is

Q. if the radius of a sphere is doubled, then find the ratio of volume of first sphere to that of 2nd sphere ?