Question : The area of a circle is 1386 cm². What is the radius of the circle?
[Use $\pi= \frac{22}{7}$]

Option 1: 7 cm

Option 2: 14 cm

Option 3: 18 cm

Option 4: 21 cm

Question : The radius and height of a right circular cone are in the ratio 1 : 2.4. If its curved surface area is 2502.5 cm², then what is its volume? (Take $\pi=\frac{22}{7}$)

Option 1: 8085 cm³

Option 2: 8820 cm³

Option 3: 11550 cm³

Option 4: 13475 cm³

Question : What is the total surface area of a solid right circular cylinder of radius 7 cm and height 8 cm?$(\pi=\frac{22}{7})$

Option 1: 560 cm²

Option 2: 660 cm²

Option 3: 850 cm²

Option 4: 760 cm²

Question : The height of a cylinder is $\frac{2}{3}$rd of its diameter. Its volume is equal to the volume of a sphere whose radius is 4 cm. What is the curved surface area (in cm²) of the cylinder?

Option 1: $\frac{112}{3} \pi$

Option 2: $32 \pi$

Option 3: $\frac{128}{3} \pi$

Option 4: $40 \pi$

Question : The radius of the base of a cylinder is 14 cm and its curved surface area is 880 cm². Its volume (in cm³) is: (Take $\pi=\frac{22}{7}$)

Option 1: 3080

Option 2: 1078

Option 3: 6160

Option 4: 9240