Advertisements
Advertisements
प्रश्न
The number of surfaces of a hollow cylindrical object is
विकल्प
1
2
3
4
उत्तर
In a hollow cylinder, there are two curved surface areas: inner and outer and one circular base with inner and outer surface area.
APPEARS IN
संबंधित प्रश्न
A metal pipe is 77 cm long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm.(See the given figure)
(i) inner curved surface area,
(ii) outer curved surface area,
(iii) total surface area.
`["Assume "pi=22/7]`
In the given figure, you see the frame of a lampshade. It is to be covered with a decorative cloth. The frame has a base diameter of 20 cm and height of 30 cm. A margin of 2.5 cm is to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade.
`["Assume "pi=22/7]`
A road roller takes 750 complete revolutions to move once over to level a road. Find the area of the road if the diameter of a road roller is 84 cm and length is 1 m.
Find the height of the cylinder whose volume is 1.54 m3 and diameter of the base is 140 cm?
How many cubic metres of earth must be dug-out to sink a well 21 m deep and 6 m diameter?
The altitude of a circular cylinder is increased six times and the base area is decreased one-ninth of its value. The factor by which the lateral surface of the cylinder increases, is
Find the volume of a cylinder which has a base diameter cm and height 24cm.
The volume of a cylinder of height 8cm is 392π cm3. Find its lateral surface area and its total surface area.
Find the area to be painted in the following block with a cylindrical hole. Given that length is 15 cm, width 12 cm, height 20 cm and radius of the hole 2.8 cm.
How many solid right circular cylinders of radius 2 cm and height 3 cm can be made by melting a solid right circular cylinder of diameter 12 cm and height 15 cm?
