Question : If the radius of a sphere is increased by 2 cm, then its surface area increases by 352 cm². The radius of the sphere initially was: (use $\pi =\frac{22}{7}$)

Option 1: 4 cm

Option 2: 5 cm

Option 3: 3 cm

Option 4: 6 cm

Question : The total surface area of a cylinder whose radius is 6 cm and height is 8 cm is: (Use $\pi=\frac{22}{7}$)

Option 1: 528 cm²

Option 2: 575 cm²

Option 3: 658 cm²

Option 4: 625 cm²

Question : The radius of a sphere is 3.5 cm. What is the total surface area of the sphere?

Option 1: 154 cm²

Option 2: 77 cm²

Option 3: 231 cm²

Option 4: 188 cm²

Question : The radius and slant height of a cone are in the ratio 5 : 7. If its curved surface area is 1347.5 cm², find its radius. $\mathrm{(Use ~\pi =\frac{22}{7})}$

Option 1: 15 cm

Option 2: 25.5 cm

Option 3: 17.5 cm

Option 4: 21 cm

Question : Find the volume of a solid sphere whose diameter is 42 cm. (Use $\pi=\frac{22}{7}$)

Option 1: 38807 cm³

Option 2: 38808 cm³

Option 3: 38806 cm³

Option 4: 38805 cm³