Q. The height of a cylinder is three times its radius. If the radius is doubled, keeping height unchanged, the ratio of new volume to old volume is:
✅ Correct Answer: (C)
4 : 1
Explanation: Height is constant. Volume ∝ r², so it becomes four times.
Explanation by: Mr. Dubey
Height is constant. Volume ∝ r², so it becomes four times.