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How many cubic metres of earth must be d...

How many cubic metres of earth must be dug out to make a well 28 m deep and 2.8 m in diameter ? Also, find the cost of plastering its inner surface at Rs 4.50 per sq. metre.

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The correct Answer is:
`172.48 m ^(3); Rs 1108.80`
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ICSE-CYLINDER, CONE AND SPHERE -EXERCISE 20 (A)
  1. A cylinder of circumference 8 cm and length 21 cm rolls without slidin...

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  2. A cylinder of circumference 8 cm and length 21 cm rolls without slidin...

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  3. How many cubic metres of earth must be dug out to make a well 28 m dee...

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  4. What length of solid cylinder 2 cm in diameter must be taken to recast...

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  5. A cylinder has a diameter of 20 cm. The area of the curved surface is ...

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  6. A cylinder has a diameter of 20 cm. The area of the curved surface is ...

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  7. A metal pipe has a bore (inner diameter) of 5 cm. The pipe is 5 mm thi...

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  8. A cylindrical container with diameter of base 42 cm contains sufficien...

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  9. A cylindrical container with internal radius of its base 10 cm, contai...

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  10. Find the total surface area of an open pipe of length 50 cm, external ...

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  11. The height and the radius of the base of a cylinder are in the ratio 3...

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  12. The radius of a solid right circular cylinder increases by 20% and its...

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  13. The radius of a solid right circular cylinder decreases by 20% and its...

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  14. The radius of a solid right circular cylinder decreases by 20% and its...

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  15. Find the minimum length in cm and correct to nearest whole number of t...

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  16. 3080 cm^(3) of water is required to fill a cylindrical vessel complet...

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  17. 3080 cm^(3) of water is required to fill a cylindrical vessel complet...

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  18. 3080 cm^(3) of water is required to fill a cylindrical vessel complet...

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  19. Find the volume of the largest cylinder formed when a rectangular piec...

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  20. Find the volume of the largest cylinder formed when a rectangular piec...

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