Class 9 Maths Chapter 13 Question Answer Youtube,Antique Boat Motors Design,Aldi Childrens Wooden Kitchen,Small Boat Sailing Knight 10 - Videos Download
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Find the outer curved surface area of the bowl. A right circular cylinder just encloses a sphere of radius r see figure. Find i surface area of the sphere, ii curved surface area of the cylinder, iii ratio of the areas obtained in i and ii.
A matchbox measures 4 cm x 2. What will be the volume of a packet containing 12 such boxes? Solution: Since, a matchbox is in the form of cuboid. A cuboidal water tank is 6 m long, 5 m wide and 4. How many litres of water can it hold? A cuboidal vessel is 10 m long and 8 m wide. How high must it be made to hold cubic metres of a liquid? The capacity of a cuboidal tank is litres of water. Find the breadth of the tank, if its length and depth are 2. A village, having a population of , requires litres of water per head per day.
It has a tank measuring 20 m x 15 m x 6 m. For how many days will the water of this tank last? A go down measures 40 m x 25 m x 10 m. Find the maximum number of wooden crates each measuring 15 m x m x 0. A solid cube of side 12 cm is cut into eight cubes of equal volume.
What will be the side of the new cube? Also, find the ratio between their surface areas. A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute? Solution: The water flowing in a river can be considered in the form of a cuboid. The circumference of the base of a cylindrical vessel is cm and its height is 25 cm.
Solution: Let the base radius of the cylindrical vessel be r cm. The inner diameter of a cylindrical wooden pipe is 24 cm and its outer diameter is 28 cm. The length of the pipe is 35 cm. Find the mass of the pipe, if 1 cm3 of wood has a mass of 0.
A soft drink is available in two packs i a tin can with a rectangular base of length 5 cm and width 4 cm, having a height of 15 cm.
Which container has greater capacity and by how much? If the lateral surface of a cylinder is The capacity of a closed cylindrical vessel of height 1 m is How many square metres of metal sheet would be needed to make it? A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in the interior. The diameter of the pencil is 7 mm and the diameter of the graphite is 1 mm. If the length of. A patient in a hospital is given soup daily in a cylindrical bowl of diameter 7 cm.
If the bowl is filled with soup to a height of 4 cm, how much soup the hospital has to prepare daily to serve patients? Find the volume of the right circular cone with i radius 6 cm, height 7 cm ii radius 3. The height of a cone is 15 cm. Thus, the required radius of the base is 10 cm. A conical pit of top diameter 3. What is its capacity in kilolitres? The volume of a right circular cone is cm 3. Thus, the required height is 48 cm. A right triangle ABC with sides 5 cm, 12 cm and 13 cm is revolved about the side 12 cm.
Find the volume of the solid so obtained. Solution: Sides of the right triangle ABC are 5 cm, 12 cm and 13cm. The right angled triangle is revolved about the side 12 cm. If the triangle ABC in Question 7 above is revolved around the side 5 cm, then find the volume of the solid so obtained. Find also the ratio of the volumes of the two solids obtained in Questions 7 and 8.
Solution: Since the right triangle is revolved around the side 5 cm. A heap of wheat is in the form of a cone whose diameter is Find its volume. The heap is to be covered by canvas to protect it from rain.
Find the area of the canvas required. Thus the required area of the canvas is Find the volume of a sphere whose radius is i 7 cm ii 0. Find the amount of water displaced by a solid spherical ball of diameter i 28 cm ii 0. The diameter of a metallic ball is 4. What is the mass of the ball, if the density of the metal is 8.
What fraction of the volume of the Earth is the volume of the Moon? Solution: Let diameter of the earth be 2r. How many litres of milk can a hemispherical bowl of diameter A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank. Find the volume of a sphere whose surface area is cm 2. A dome of a building is in the form of a hemisphere. A capsule of medicine is in the shape of a sphere of diameter 3.
How much medicine in mm 3 is needed to fill this capsule? The thickness of the plank is 5 cm everywhere. The external faces are to be polished and the inner faces are to be painted. If the rate of polishing-is 20 paise per cm 2 and the rate of pointing is 10 paise per cm 2 , find the total expenses required for palishing and painting the surface of the bookshelf.
The front compound wall of a house is decorated by wooden spheres of diameter 21 cm, placed on small supports as shown in figure. Eight such spheres are-used for this purpose, and are to be painted silver.
Each support is a cylinder of radius 1. Find the cost of paint required if silver paint costs 25 paise per cm 2 and black paint costs 5 paise per cm 2.
By what per cent does its curved surface area decrease? So if you are planning to excel in competitive exams, make sure all your concepts are clear. In this chapter, students will understand how to calculate the surface area of objects and the volume occupied using the given data. In Ex Indirect questions about calculating the surface areas will be asked in the exams. So students should be well versed with the concepts. This will ensure that even if the question is twisted, they can solve them and focus on just the important information and not get confused with the twists and turns of the question.
Sometimes, there are tricky questions asked in the exam and students get extremely confused on how to solve them. At Vedantu, we come up with the easiest method to solve even the trickiest question and clear each and every concept with an easy to understand approach. Exercise In these exercises, you will learn how to evaluate the surface area of three-dimensional objects and the curved surface area of the cylinder objects.
In these exercises, students will learn about volumes of different geometrical objects and how to calculate the volume of a cone, cylinder, cuboid, sphere, etc. Students sometimes feel mathematics is a little difficult to understand and struggles with the concepts. With Vedantu, students can solve Exercise
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