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Exercise 13.5 Class 10 maths 13. Surface Areas and Volumes - ncert solutions - Toppers Study

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Exercise 13.5 Class 10 maths 13. Surface Areas and Volumes - ncert solutions - Toppers Study

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Exercise 13.5 class 10 Mathematics Chapter 13. Surface Areas and Volumes

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Exercise 13.5 Class 10 Maths 13. Surface Areas And Volumes - Ncert Solutions - Toppers Study
Class 10 Ncert Solutions
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Chapter 13. Surface Areas And Volumes Exercise 13.5 Class 10

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13. Surface Areas and Volumes

| Exercise 13.5 |

Exercise 13.5 Class 10 maths 13. Surface Areas and Volumes - ncert solutions - Toppers Study

Exercise 13.5

1. A copper wire, 3 mm in diameter, is wound about a cylinder whose length is 12 cm, and diameter 10 cm, so as to cover the curved surface of the cylinder. Find the length and mass of the wire, assuming the density of copper to be 8.88 g per cm3.
2. A right triangle, whose sides are 3 cm and 4 cm (other than hypotenuse) is made to revolve about its hypotenuse. Find the volume and surface area of the double cone so formed. (Choose value of π as found appropriate.)
3. A cistern, internally measuring 150 cm × 120 cm × 110 cm, has 129600 cm3 of water in it. Porous bricks are placed in the water until the cistern is full to the brim. Each brick absorbs one-seventeenth of its own volume of water. How many bricks can be put in without overflowing the water, each brick being 22.5 cm × 7.5 cm × 6.5 cm?
4. In one fortnight of a given month, there was a rainfall of 10 cm in a river valley. If the area of the valley is 97280 km2, show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long, 75 m wide and 3 m deep.
5. An oil funnel made of tin sheet consists of a 10 cm long cylindrical portion attached to a frustum of a cone. If the total height is 22 cm,
diameter of the cylindrical portion is 8 cm and the diameter of the top of the funnel is 18 cm, find the area of the tin sheet required to make
the funnel (see Fig. 13.25).
6. Derive the formula for the curved surface area and total surface area of the frustum of a cone, given to you in Section 13.5, using the symbols as explained.
7. Derive the formula for the volume of the frustum of a cone, given to you in Section 13.5, using the symbols as explained.

Other Pages of this Chapter: 13. Surface Areas and Volumes

1. Chapter 13. Surface Areas and Volumes | Exercise 13.1

2. Chapter 13. Surface Areas and Volumes | Exercise 13.2

3. Chapter 13. Surface Areas and Volumes | Exercise 13.3

4. Chapter 13. Surface Areas and Volumes | Exercise 13.4

5. Chapter 13. Surface Areas and Volumes | Exercise 13.5

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