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Three cubes of metal with edges 3 cm, 4 ...

Three cubes of metal with edges 3 cm, 4 cm and 5 cm respectively are melted to form a single cube. The lateral surface area of the new cube formed is

A

`144cm^2`

B

`72 cm^2`

C

`256cm^2`

D

`128 cm^2`

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MODERN PUBLICATION-SURFACE AREAS AND VOLUMES-EXERCISE
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  2. The volume of a cube is 512cm^3. Its total surface area is

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  3. Three cubes of metal with edges 3 cm, 4 cm and 5 cm respectively are m...

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  4. Two cubes have their volumes in the ratio 1:27. the ratio of their sur...

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  5. The diameter of the base of a cylinder is 6 cm and its height is 1 4 c...

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  6. If the curved surface area of a cylindre is 1760cm^2. And its base is ...

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  7. Vertical cross section of a right circular cylinder is always a

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  8. The number of surfaces of a hollow cylindrical object is

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  9. If the height of a cylinder is doubled and radius remains the same, th...

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  10. If the height of a cylinder is doubled, by what number must the radius...

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  11. The height h of a cylinder equal the circumference of the cylinder. In...

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  12. Two steel sheets each of length a1 and breadth a2 are used to prepare ...

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  13. The radius of a wire is decreased to one third. If volume remains the ...

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  14. The height of a cone is 21 cm and its slant height is 28 cm. the volum...

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  15. If the volumes of two cones be in the ratio 1:4 and the radii of their...

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  16. The ratio of the volumes of a right circular cylinder and a right circ...

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  17. If the height and the radius of a cone are doubled, he volume of the c...

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  18. The volume of a sphere of radius 10.5 cm is

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  19. The volume of a sphere is 38808 cm^3. Its curved surface area is

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  20. The radius of a hemispheircal balloon increases from 6 cm to 2 cm is a...

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