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 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 curved surface area of a right circular cylinder of height 56 cm is 1408 cm². Find the diameter of the base of the cylinder.

Option 1: 8 m

Option 2: 0.04 m

Option 3: 0.08 m

Option 4: 0.008 m

Question : A sphere has the same curved surface area as a cone, with a vertical height of 40 cm and a radius of 30 cm. The radius of the sphere is:

Option 1: $5 \sqrt 5 \text{ cm}$

Option 2: $5\sqrt 3\text{ cm}$

Option 3: $5\sqrt{15}\text{ cm}$

Option 4: $5\sqrt{10}\text{ cm}$

Question : The curved surface area of a right circular cone of a base radius of 21 cm is 594 sq. cm. What is the slant height of the cone?

Option 1: 15 cm

Option 2: 11 cm

Option 3: 9 cm

Option 4: 6 cm