Question : The lateral surface area of a frustum of a right circular cone, if the area of its base is 16$\pi$ cm², the diameter of the circular upper surface is 4 cm and the slant height is 6 cm, will be:

Option 1: $30\pi$ cm²

Option 2: $48\pi$ cm²

Option 3: $36\pi$ cm²

Option 4: $60\pi$ cm²

Question : The volume of a solid right circular cylinder of height 8 cm is $392 \pi$ cm³. Its curved surface area (in cm²) is:

Option 1: $161 \pi$

Option 2: $96 \pi$

Option 3: $210 \pi$

Option 4: $112 \pi$

Question : The volume of a cylinder is 4312 cm³. Its curved surface area is one-third of its total surface area. Its curved surface area (in cm²) is:
(Take $\pi=\frac{22}{7}$ )

Option 1: 572 cm²

Option 2: 528 cm²

Option 3: 660 cm²

Option 4: 616 cm²

Question : The volume of a conical tent is 1232 m³ and the area of its base is 154 sq m. Find the length of the canvas required to build the tent, if the canvas is 2 m in width. (Take $\pi=\frac{22}{7}$)

Option 1: 270 m

Option 2: 272 m

Option 3: 276 m

Option 4: 275 m

Question : The slant height of a cone is 20 cm. If the area of its base is 616 cm², then what is the curved surface area of this cone? (use $\pi=\frac{22}{7}$)

Option 1: 960 cm²

Option 2: 400 cm²

Option 3: 1760 cm²

Option 4: 880 cm²