Question : Find the surface area of a sphere whose radius is 3.5 cm. Use $(\left.\pi=\frac{22}{7}\right)$.

Option 1: 154 cm²

Option 2: 152 cm²

Option 3: 146 cm²

Option 4: 160 cm²

Question : If the radius of a sphere is increased by 2 cm, then its surface area increases by 352 cm². The radius of the sphere initially was: (use $\pi =\frac{22}{7}$)

Option 1: 4 cm

Option 2: 5 cm

Option 3: 3 cm

Option 4: 6 cm

Question : A solid sphere of diameter 7 cm is cut into two equal halves. What will be the increase in its total surface area?

Option 1: 77 cm²

Option 2: 60.5 cm²

Option 3: 65.5 cm²

Option 4: 55 cm²

Question : The total surface area of a right circular cylinder with a radius of the base 7 cm and height 20 cm, is:

Option 1: 900 cm²

Option 2: 140 cm²

Option 3: 1000 cm²

Option 4: 1188 cm²

Question : The difference between the total surface area and the lateral surface area of a cube of side 12 cm is:

Option 1: 292 cm²

Option 2: 290 cm²

Option 3: 288 cm²

Option 4: 286 cm²