Surface area of a sphere

Q.

If radius of earth is approximately 4 times that of moon, then earth's surface area is 8 times that of moon. State with true or false.

1. False

2. True

Q. The diameter of the moon is approximately one-fourth of the diameter of the earth. Find the ratio of their surface areas.

Q. The ratio of the radius of two sphere is 3 : 2 Then the ratio of their surface area is

1. $4:9$
2. $\sqrt{3}:\sqrt{2}$
3. $9:4$
4. $3:2$

Q. A solid sphere of radius $r$ is sliced by the planes passing through its centre and perpendicular to each other. The total surface area of each of the pieces so formed is

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