Question : Steel is used to make a hemispherical bowl that is 0.37 cm thick. The bowl's inner radius is 6 cm. Find the bowl's outside curved surface area (take $\pi=\frac{22}{7}$).

Option 1: 532 cm²

Option 2: 255.0548 cm²

Option 3: 484 cm²

Option 4: 523.4107 cm²

Question : A hollow sphere has an outer radius of 6 cm and inner radius of 3 cm. What is the volume of this hollow sphere?

Option 1: 252$\pi$ cm³

Option 2: 356$\pi$ cm³

Option 3: 144$\pi$ cm³

Option 4: 175$\pi$ cm³

Question : The volume of a sphere of radius 4.2 cm is: (Use $\pi=\frac{22}{7}$)

Option 1: 278.234 cm³

Option 2: 312.725 cm³

Option 3: 297.824 cm³

Option 4: 310.464 cm³

Question : The external diameter of an iron pipe is 20 cm and its length is 12 cm. If the thickness of the pipe is 1 cm, find the surface area of the pipe (take $\pi=\frac{22}{7}$ ) correct to two places of decimal.

Option 1: 1,662.67 cm²

Option 2: 1,552.57 cm²

Option 3: 1,442.48 cm²

Option 4: 1,772.76 cm²

Question : The height of a cylinder is 6 cm more than the radius of its base. If its radius is 14 cm, then what will be the volume of this cylinder? (use $\pi=\frac{22}{7}$)

Option 1: 13,560 cm³

Option 2: 14,340 cm³

Option 3: 10,440 cm³

Option 4: 12,320 cm³