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## 16. A copper sphere of radius 3 cm is melted and recast into a right circular cone of height 3 cm. Find the radius of the base of the cone.

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Explain the question using, formulas given in the chapter. Class 10th, Cbse, RD Sharma, Surface area and volumes.

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## 17. A copper rod of diameter 1 cm and length 8 cm is drawn into a wire of length 18 m of uniform thickness. Find the thickness of the wire.

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Explain the question using, formulas given in the chapter. Class 10th, Cbse, RD Sharma, Surface area and volumes.

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## 18. The diameters of the internal and external surfaces of a hollow spherical shell are 10cm and 6 cm, respectively. If it is melted and recast into a solid cylinder of the length of 8/3, find the diameter of the cylinder.

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Explain the question using, formulas given in the chapter. Class 10th, Cbse, RD Sharma, Surface area and volumes.

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## 19. How many coins 1.75 cm in diameter and 2 mm thick must be melted to form a cuboid 11 cm x 10 cm x 7 cm?

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Explain the question using, formulas given in the chapter. Class 10th, Cbse, RD Sharma, Surface area and volumes.

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## 20. The surface area of a solid metallic sphere is 616 cm2. It is melted and recast into a cone of height 28 cm. Find the diameter of the base of the cone so formed.

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Explain the question using, formulas given in the chapter. Class 10th, Cbse, RD Sharma, Surface area and volumes.

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## 15. An iron spherical ball has been melted and recast into smaller balls of equal size. If the radius of each of the smaller balls is 1/4 of the radius of the original ball, how many such balls are made? Compare the surface area of all the smaller balls combined together with that of the original ball.

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Explain the question using formulas given in the chapter. Class 10th Cbse, RD Sharma.

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## 14. The diameter of a metallic sphere is equal to 9 cm. It is melted and drawn into a long wire of diameter 2 mm having a uniform cross-section. Find the length of the wire.

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Explain the question using formulas given in the chapter. Class 10th Cbse, RD Sharma.

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## 13. A solid metallic sphere of radius 10.5 cm is melted and recast into a number of smaller cones, each of radius 3.5 cm and height 3 cm. Find the number of cones so formed.

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Explain the question using formulas given in the chapter. Class 10th Cbse, RD Sharma.

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## 12. Three cubes of a metal whose edges are in the ratio 3: 4: 5 are melted and converted into a single cube whose diagonal is 12√3 cm. Find the edges of the three cubes.

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Explain the question using formulas given in the chapter. Class 10th Cbse, RD Sharma.

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## 11. How many spherical lead shots of diameter 4 cm can be made out of a solid cube of lead whose edge measures 44 cm?

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Explain the question using formulas given in the chapter. Class 10th Cbse, RD Sharma.