Question : Find the surface area of a sphere whose radius is 3.5 cm. Use $(\left.\pi=\frac{22}{7}\right)$.

Option 1: 154 cm²

Option 2: 152 cm²

Option 3: 146 cm²

Option 4: 160 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 : 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 sum of the radius of the base and the height of a cylinder is 42 m. If the total surface area of the cylinder is 6336 m², find the curved surface area of the cylinder correct to two places of decimals (use $\pi=\frac{22}{7}$).

Option 1: 2157.43 m²

Option 2: 2571.43 m²

Option 3: 2715.43 m²

Option 4: 2517.43 m²

Question : The total surface area of a solid hemisphere of diameter 14 cm is (use $\pi=\frac{22}{7}$ ):

Option 1: 522 cm²

Option 2: 462 cm²

Option 3: 428 cm²

Option 4: 584 cm²