Question : A solid cylinder having a radius of the base of 7 cm and a length of 20 cm is directed from its height to get two identical cylinders. What will be the percentage increase in the total surface area?

Option 1: 29.78

Option 2: 25.93

Option 3: 27.62

Option 4: 32.83 

Question : The radius of the ends of a frustum of a solid right-circular cone 45 cm high is 28 cm and 7 cm. If this frustum is melted and reconstructed into a solid right circular cylinder whose radius of base and height are in the ratio 3: 5, find the curved surface area (in ${cm}^2$ ) of this cylinder. [Use $\pi=\frac{22}{7}$.]

Option 1: 4580

Option 2: 4610

Option 3: 4640

Option 4: 4620

Question : What is the total surface area of a solid right circular cylinder of radius 7 cm and height 8 cm?$(\pi=\frac{22}{7})$

Option 1: 560 cm²

Option 2: 660 cm²

Option 3: 850 cm²

Option 4: 760 cm²

Question : The curved surface area and circumference at the base of a solid right circular cylinder are 2200 cm² and 110 cm, respectively. Find the height of the cylinder.

Option 1: 24 cm

Option 2: 22 cm

Option 3: 20 cm

Option 4: 18 cm

Question : What is the curved surface area (in cm²) of a cylinder having a radius of base as 14 cm and height as 10 cm?

Option 1: 440

Option 2: 880

Option 3: 220

Option 4: 1320

Question : A cylinder of height 8 cm and radius 6 cm is melted and converted into three cones of the same radius and height of the cylinder. Determine the total curved surface area of cones.

Option 1: $180 \pi\operatorname{cm^2}$

Option 2: $60 \pi\operatorname{cm^2}$

Option 3: $144 \pi\operatorname{cm^2}$

Option 4: $120 \pi\operatorname{cm^2}$