Mensurationhard · Past Paper
A metal cylinder of radius 4 cm and height 10 cm is melted to form spheres of radius 2 cm each. How many spheres can be made?
A15
B30
C60
D45
✓ Correct Answer: A — 15
Vol_cyl = π*4*4*10 = 160π. Vol_sph = (4/3)π*2^3 = 32π/3. Number = 160π / (32π/3) = (160 * 3) / 32 = 15.
Share this question
More from Mensuration
- Find the height of a cylinder if its volume is 308 cm^3 and radius is 7 cm.
- Three metal cubes of sides 3 cm, 4 cm, and 5 cm are melted to form a single cube. What is the side of the new cube?
- The area of a circle is 154 sq. cm. What is its radius?
- Find the volume of the largest right circular cone that can be cut out of a cube whose edge is 9 cm.
- What is the volume of a right circular cylinder if its diameter is 14 cm and height is 5 cm?