Home
Class 10
MATHS
The diameter of a hemisphere iron-ball i...

The diameter of a hemisphere iron-ball is 42 d cm . Calculate the cost of colouring the upper surface of it at the rate of ₹1.50 per square-meter.

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • SPHERE

    CALCUTTA BOOK HOUSE|Exercise EXERCISE|36 Videos

  • SIMPLE INTEREST

    CALCUTTA BOOK HOUSE|Exercise Long-answer type questions|37 Videos

  • THEOREMS RELATED TO CIRCLE

    CALCUTTA BOOK HOUSE|Exercise EXERCISE - 1 (Long - answer type question )|9 Videos

Similar Questions

Explore conceptually related problems

The length of diameter of base of a hemispherical tomb is 42 dcm. Calculate the cost of colouring the upper surface of the tomb at the rate of ₹ 35 per square metre.

External diameter of a hemispherical wooden pot is 10 cm and its thickness is 1 cm. Calculate the cost of colouring the pot at the rate of Rs 10 per square cm.

The internal and external diameters of a semicircular hollow sphere are 25 cm and 25 cm respectively. Calculate the cost of colouring the hemisphere at the rate ₹0.05 per square meter.

The base area of a right circular cone is 21m and height is 14m . Calculate the expenditure to colour the curved surface at the rate of rs. 1.50 per sq.m.

The diameter of the base of a right circular cone is 21 metres and height is 14 metres. What will be the expenditure to colour the curved surface at the rate ₹ 1.50 per square metre?

Both ends of right circular cylindrical tank are semicircular . If diameter of the tank be 1.4 metre and length be 5 metre , then what will be the expenditure of colouring the external surface of the tank at the rate of Rs 10 per square - metre ?

Calculate how many cubic decimetre of concrete materials will be needed to construct two cylindrical pillars each of whose diameter is 5*6 decimetres and height is 2*5 metres. Calculate the cost of plastering the curved surface area of the two pillars at Rs. 125 per sq-metres.

The quantity of iron - sheet to make a boy a of right circular conical shape is 75(3)/(7) sq-m. if the slant height of it 5 m, then calculate the volume of air in the boya and its height. Determine of the expenditure to colour the whole surface of the boya at the rate of rupees 2.80 per square - metres. [The width of the iron - sheet not to be considered while calculating.]

The length of the base diameter of a wooden toy of conical shape uis 10 cm . The expenditure for polishing whole surfaces of the toy at the raye of rupees 2.10 per square - metre is rupees 429. Calculate the height of the toy. Also determine the quantity of wood which is required to make the toy.

The length of the base diameter of a wooden toy of conical shape is 10 cm. The expenditure for polishing whole surfaces of the toy at the rate of Rs. 2.10 perm² is Rs. 429. Calculate the height of the toy and also determine the quantity of wood which is required to make the toy.​

CALCUTTA BOOK HOUSE-SPHERE-EXERCISE
  1. The height of a sphere is equal to its .

    Text Solution

    |

  2. If a circular iron-plate of thickness (1)/(150) cm is made from an iro...

    Text Solution

    |

  3. The diameter of a hemisphere iron-ball is 42 d cm . Calculate the cost...

    Text Solution

    |

  4. If a solid large sphere is made by melting three small gold-sphere of ...

    Text Solution

    |

  5. If the radius of a sphere be doubled, then what percent of its whole s...

    Text Solution

    |

  6. How many smaller sphere of diameter 1 cm will be got by meltin a soli...

    Text Solution

    |

  7. If a solid metal-sphere id made by melting two metal hemisphere of dia...

    Text Solution

    |

  8. If the radius of a sphere be decreased by 10%, then what percent of it...

    Text Solution

    |

  9. Calculate the whole surface area of a hemisphere metal bowl of interna...

    Text Solution

    |

  10. If the ratio of the volume and the whole surface area of a solid spher...

    Text Solution

    |

  11. If the external dimeter of a hollow iron-sphere be 12cm and the thickn...

    Text Solution

    |

  12. If three smaller sphrer are made by melting a solid metal sphere of r...

    Text Solution

    |

  13. Three smaller circular balls are made by melting a copper spherical ba...

    Text Solution

    |

  14. How many metal sphere of radius 5 mm can be made by melting a metal s...

    Text Solution

    |

  15. 6.4 litres and 21.6 liters of water can be put into two hemisphere pot...

    Text Solution

    |

  16. The ratio of the volumes of two spheres is 64:27. If the sum of their ...

    Text Solution

    |

  17. The internal and external diameters of a semicircular hollow sphere ar...

    Text Solution

    |

  18. The mass of a hollow iron-sphere of external radius 21cm is 22775(5)/(...

    Text Solution

    |

  19. The external and interenal diameter of a hollow metal spheres are 12c...

    Text Solution

    |

  20. If the volume of a hollow iron-sphere of thickness 3 cm be 490(2)/(7)...

    Text Solution

    |