Mensurationmedium · Past Paper
A metallic sphere of radius 10.5 cm is melted and then recast into small cones, each of radius 3.5 cm and height 3 cm. Find the number of cones.
A126
B21
C63
D130
✓ Correct Answer: A — 126
Vol sphere = 4/3π(10.5)³. Vol cone = 1/3π(3.5)²(3). N = [4 * (10.5)³] / [(3.5)² * 3] = [4 * 3.5³ * 3³] / [3.5² * 3] = 4 * 3.5 * 9 = 126.
Share this question
More from Mensuration
- A cube of side 4 cm is cut into 1 cm cubes. How many small cubes are there?
- Area of a quadrant of circle is 154 sq. cm. Find its radius.
- The volume of a sphere is 4851 cm^3. Find its radius. (Use π = 22/7)
- What is the volume of a cube with a side length of 5 cm?
- The total surface area of a prism with an equilateral triangular base of side 'a' and height 'h' is: