Question : The radius of a spherical balloon is inflated from 7 cm to 10.5 cm. The percentage increase in its surface area is:

Option 1: 150%

Option 2: 125%

Option 3: 120%

Option 4: 135%

Question : The radius of a spherical balloon is inflated from 3.5 cm to 4.9 cm by pushing air into it. What is the percentage increase in the volume of the original balloon?

Option 1: 173.6%

Option 2: 174.4%

Option 3: 74.4%

Option 4: 73.6%

Question : What is the surface area (in cm²) of a spherical sculpture whose radius is 35 cm?
(Take $\pi=\frac{22}{7}$)

Option 1: 16540

Option 2: 15700

Option 3: 15400

Option 4: 14500

Question : The sum of the curved surface area and the total surface area of a solid cylinder is 2068 cm². If the radius of its base is 7 cm, then what is the volume of this cylinder? (use $\pi=\frac{22}{7}$)

Option 1: 2060 cm³

Option 2: 2480 cm³

Option 3: 3080 cm³

Option 4: 2760 cm³

Question : If the surface area of a sphere is 346.5 cm², then its radius is: (Take $\pi=\frac{22}{7}$)

Option 1: 7 cm

Option 2: 3.25 cm

Option 3: 5.25 cm

Option 4: 9 cm

Question : The radius and height of a cylinder are in the ratio 4: 7 and its volume is 2816 cm³. Find its radius. (Take $\pi=\frac{22}{7}$ )

Option 1: 5 cm

Option 2: 7 cm

Option 3: 8 cm

Option 4: 6 cm