Mensurationmedium · Past Paper
If the height of a cylinder is doubled and the radius is halved, the new curved surface area will be:
ASame
BDoubled
CHalved
DFour times
✓ Correct Answer: A — Same
New CSA = 2π(r/2)(2h) = 2πrh. It remains the same.
Share this question
More from Mensuration
- The volume of a cylindrical container is 448π cm³ and its height is 7 cm. Find its curved surface area.
- A cubical block of metal weighs 16 kg. What is the weight of another block of the same metal whose each side is double that of the first block?
- A cylinder of height 12 cm and radius 3 cm is melted to form a cone of radius 3 cm. What will be the height of the cone?
- The rain water from a roof of 22 m × 20 m drains into a cylindrical vessel having diameter of base 2 m and height 3.5 m. If the vessel is just full, find the rainfall in cm.
- If the length, breadth, and height of a cuboid are in the ratio 3:2:1 and its total surface area is 792 sq. cm, find its dimensions.