2016 · Q88
A cylindrical closed tank contains 36π cubic metres of water, and is filled to half of its capacity. When the cylindrical tank is placed upright on its circular base on level ground, the height of the water in the tank is 4 metres. But, when this tank is placed on its side on level ground, what will be the height of the surface of the water above the ground?
General ScienceChemistry
- A9 metres
- B6 metres
- C3 metres
- D1 metre
Explanation
Water volume 36π = πr² × 4 (height 4 m upright) gives r² = 9, so r = 3 m; the tank’s full height is 8 m. Laid on its side, the half-full tank’s water surface passes through the cylinder’s axis, so its height above the ground equals the radius: 3 m. Hence (C).