Home
Class 9
MATHS
The front compound wall of a house is de...

The front compound wall of a house is decorated by wooden spheres of diameter 21 cm, placed on small supports as shown in Fig 13.32. Eight such spheres are used for this purpose, and are to be painted silver. Each support is a cylinder of radius 5cm and height 7cm and is painted black.Find the cost of paint required if silver paint cost 25 paisa per `cm^2` and black paint cost 5 paisa per `cm^2`

Promotional Banner

Topper's Solved these Questions

  • SURFACE AREA AND VOLUME OF A RIGHT CIRCULAR CYLINDER CONE

    RD SHARMA|Exercise All Questions|128 Videos

  • TABULAR REPRESENTATION OF STATISTICAL DATA

    RD SHARMA|Exercise All Questions|62 Videos

Similar Questions

Explore conceptually related problems

Percentage of silver in silver paint is

The cost of painting the given sign board at the rate of 9 paise per cm^(2) is

What are silver paint and german silver made of ?

A conical cap has the base diameter 24 cm and height 16 cm. What is the cost of painting the surface of the cap at the rate of 70 paise per sq cm?

The sides of a triangle shaped sheet are 5cm, 12cm and 13cm. Find the cost of painting on the sheet at the rate of Rs 30 per cm^(2) ?

10 cylindrical pillars of a building have to be painted. The diameter of each pillar is 70cm and the height is 4m. What is the cost of painting at the rate of Rs 5 per square metre

The side of a triangle shaped sheet are 5cm, 12cm and 13cm. Find the cost of painting on the sheet at the rate of Rs 30 per cm sq.

A cylindrical pillar is 50cm in diameter and 3.5m in height.Find the cost of painting the curved surface of the pillar at the rate of Rs12.50 per

The outer diameter of a pipe is 70 cm and it is 21 m long. Find the cost of painting the outer surface of the pipe at the rate of Rs 10 per square metre

The internal and external diameters of a hollow hemi spherical vessel are 20 cm and 28 cm, respectively. Find the cost of painting the vessel at the rate of 14 paise per cm^(2) .

RD SHARMA-SURFACE AREA AND VOLUME OF A SPHERE -All Questions
  1. A storage tank consists of a circular cylinder with a hemisphere ad...

    Text Solution

    |

  2. The diameter of the moon is approximately one fourth of the diamete...

    Text Solution

    |

  3. The front compound wall of a house is decorated by wooden spheres of...

    Text Solution

    |

  4. A hemispherical bowl is made of steel 0.5 cm thick. The inside radi...

    Text Solution

    |

  5. The volume of the two spheres are in the ratio 64:27. Find the diff...

    Text Solution

    |

  6. A cylinder of radius 12cm contains water to a depth of 20cm. A sphe...

    Text Solution

    |

  7. A vessel in the form of a hemisphereical bowl is full of water. The...

    Text Solution

    |

  8. A dome of a building is in the form of a hemisphere. From inside, i...

    Text Solution

    |

  9. Twenty seven solid iron spheres, each of radius r and surface area S a...

    Text Solution

    |

  10. A wooden toy is in the form of a cone surmounted on a hemisphere. T...

    Text Solution

    |

  11. A toy is in the shape of a right circular cylinder with a hemispher...

    Text Solution

    |

  12. Three solid spheres of iron whose diameters are 2cm, 12cm and 16cm,...

    Text Solution

    |

  13. How many spherical lead shots each 4.2 cm in diameter can be obtain...

    Text Solution

    |

  14. A sphere of diameter 6cm is dropped in a right circular cylindrical...

    Text Solution

    |

  15. A solid lead ball of radius 7cm was melted and then drawn into a wi...

    Text Solution

    |

  16. A sphere, a cylinder and a cone are of the same radius and same hei...

    Text Solution

    |

  17. Find the surface area and total surface area of a hemisphere of rad...

    Text Solution

    |

  18. Find the surface area of a sphere of radius 7cm.

    Text Solution

    |

  19. The internal and external diameters of a hollow hemispherical vesse...

    Text Solution

    |

  20. The internal and external diameters of a hollow hemi-sphereical ves...

    Text Solution

    |