Question

the graphite
INCERT Textbook!
1 mm.
Ans.
cm3. Determine its radius.
5
1 = 0.11 cm
(i) the height; and
and 22 cm,
W. Find the volume of a sphere having radius 2.5 cm.
12 The surface area of a sphere is 154 cm. What is its volume?
Find the volume and the total surface area of a hemisphere of radius 2 cm.
7
4. The volume of a sphere is 905
The largest sphere is to be carved out of a right circular cylinder of radius 7 cm and height 14
Each of the radius of the base of a cone and that of a sphere is 8 cm. If the volumes of these
cm. Find the volume of the sphere.
solids are equal, find the slant height of the cone.
7. The surface area of a sphere of radius 5 cm is five times the area of the curved surface of a
cone of radius 4 cm. Find
(ii) the volume of the cone.
8. Find the weight of a hollow sphere of metal having internal and external diameters as 20 cm
respectively if 1cm² of metal weighs 21 g.
9. The surface area of a sphere and a cube are equal. Prove that their volumes are in the ratio
10. The water for a house is stored in hemispherical tank, whose internal diameter is 14 m. When it
contains 50 kl of water, the tank is refilled to its capacity. Calculate the volume of water pumped
11. A metallic sphere of diameter 3 cm is melted and recast into three spheres. The radius of one
of these spheres is 0.75 cm and that of another is 1.25 cm. Determine the radius of the third
12. The diameter of a copper sphere is 18 cm. The sphere is melted and is drawn into a long wire
of uniform circular cross-section. If the length of the wire is 108 m, find its diameter.
13. A solid sphere of radius 'r' is melted and recast into a hollow cylinder of uniform thickness.
If the external radius of the base of the cylinder is 4 cm, its height 24 cm and thickness 2 cm,
14. 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.
√2/6.
1:V
= 5.39 cm
in for refilling
ame of the graphite
13.
I of diameter 7 cm. If the
Ans.
e hospital has to prepare
[NCERT Textbook]
find the value of 'r'.​

Answer 1

Answer:

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Step-by-step explanation:

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