The curved surface of a sphere is 64 π cm². Find its radius?

Related Mcqs:

1. Surface area of a sphere is 2464 cm2. If its radius is doubled, then the surface area of _________?the new sphere will be

   A. 4920 cm2
   B. 4727 cm2
   C. 9856 cm2
   D. 19712 cm2

2. If a solid sphere of radius 10 cms is moulded into 8 spherical solid balls of equal radius, then surface area of each ball (in cm²) is________?

   A. 100π
   B. 7π
   C. 60π
   D. 50π

3. The curved surface area of a cylindrical pillar is 264 m2 and its volume is 924 m3. Find the ratio of its diameter to its height.

   A. 3 : 7
   B. 7 : 3
   C. 6 : 7
   D. 7 : 6

4. The radius of a cylinder is 2 r units and height is 3 r units. Find the curved surface?

   A. 18 πr² sq units
   B. 3 πr² sq units
   C. 12 πr² sq units
   D. 6 πr² sq units

5. The slant height of a cone is 12 cm and radius of the base is 4cm, find the curved surface of the cone.

   A. 74 π cm²
   B. 36 π cm²
   C. 48 π cm²
   D. 24 π cm²

6. How many shots of 1cm radius can be prepared from a sphere of 3cm radius?

   A. 36
   B. 64
   C. 27
   D. 16

7. A metallic sphere of radius 12 cm is melted and drawn into a wire, whose radius of cross section is 16 cm. What is the length of the wire?

   A. 45 cm
   B. 18 cm
   C. 90 cm
   D. None of these

8. If the volume and surface area of a sphere is numerically the same then it’s radius is_________?

   A. 1 unit
   B. 2 units
   C. 3 units
   D. 4 units

9. If the radius of the sphere is doubled then it’s volume is increased by?

   A. 100 %
   B. 200 %
   C. 700 %
   D. 800 %

10. The length of the wire of 0.2mm radius that can be drawn after melting a solid copper sphere of diameter 18cm?

    A. 24.3 m
    B. 243 m
    C. 2430 m
    D. 24300 m