Question : The curved surface area of the sphere is 154 cm². Find the volume of the sphere (rounded off to one digit after decimal).

Option 1: 156.9 cm³

Option 2: 179.7 cm³

Option 3: 161.1 cm³

Option 4: 147.8 cm³

Question : The surface area of a sphere is 221.76 cm². Its volume (in cm³) is (correct to one decimal place):
(Take $\pi=\frac{22}{7}$)

Option 1: 315.6

Option 2: 289.8

Option 3: 280.4

Option 4: 310.5

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 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 : If the surface area of a sphere is $1386 \mathrm{~cm}^2$, then its volume is:
(Take $\pi=\frac{22}{7}$ )

Option 1: 8451 cm³

Option 2: 4851 cm³

Option 3: 5418 cm³

Option 4: 4581 cm³