Q : 11 The students of a Vidyalaya were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base, using cardboard. Each penholder was to be of radius and height . The Vidyalaya was to supply the competitors with cardboard. If there were 35 competitors, how much cardboard was required to be bought for the competition?
Q : 10 In Fig. , you see the frame of a lampshade. It is to be covered with a decorative cloth. The frame has a base diameter of and height of . A margin of 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.
Q : 9 Find (ii) how much steel was actually used, if of the steel actually used was wasted in making the tank.
Q : 9 Find
(i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is in diameter and high.
Q : 8 In a hot water heating system, there is a cylindrical pipe of length and diameter . Find the total radiating surface in the system.
Q : 7 The inner diameter of a circular well is . It is deep. Find
(ii) the cost of plastering this curved surface at the rate of Rs 40 per .
Q : 7 The inner diameter of a circular well is . It is deep. Find
(i) its inner curved surface area.
Q : 6 Curved surface area of a right circular cylinder is . If the radius of the base of the cylinder is , find its height.
Q : 5 A cylindrical pillar is in diameter and in height. Find the cost of painting the curved surface of the pillar at the rate of per .
Q: 4 The diameter of a roller is and its length is . It takes complete revolutions to move once over to level a playground. Find the area of the playground in .
Q : 3 A metal pipe is long. The inner diameter of a cross section is 4 cm, the outer diameter being (see Fig. ). Find its
(iii) total surface area.
Q : 3 A metal pipe is long. The inner diameter of a cross section is , the outerdiameter being (see Fig. ). Find its
(ii) Outer surface area.
Q : 3 A metal pipe is long. The inner diameter of a cross section is , the outer diameter being (see Fig. ). Find its
(i) inner curved surface area,
Q : 2 It is required to make a closed cylindrical tank of height and base diameter from a metal sheet. How many square metres of the sheet are required for the same?
Q: 1 The curved surface area of a right circular cylinder of height is . Find the diameter of the base of the cylinder.