Question

13.
14.
13. A piece of ductile metal is in the form of a cylinder of diameter 1cm and length 11 cm. It is drawn out into a
14. A hollow cylindrical copper pipe is 21 dm long. Its outer and inner diameters are 10 cm and 6 cm
Two cylindrical cans have bases of same size.
and is 20 cm high. Find the ratio of their
wire of diameter 1 mm. What will be the length of the wire so obtained?
respectively. Find the volume of the copper used in making the pipe.
15. The inner and outer radii of the hollow cylinder are 15 cm and 20 cm respectively. The cylinder is melted and
recast into a solid cylinder of the same length. Find the radius of the base of the new cylinder. [V7=2.65]
16. The inner diameter of a wooden cylindrical pipe is 24 cm and its outer diameter is 28 cm. The length of pipe
is 35 cm. Find the mass of the pipe, if 1 cm of wood weighs 3 g.
17. A well with 10 m inside diameter is dug 14 m deep. Earth taken out of it has been spread all around to a width
of 5 m to form an embankment. Find the height of the embankment.
18. The length of a metallic tube is lm, its thickness is 1 cm and its inner diameter is 12 cm. Find the weight of
the tube if the density of the metal is 7.7 grams per cubic cm.
[Hint: Weight of 1 cm3 of metal = 7.7 g.
Its volume =(TTX72x100 - Tex62x100) cm3]
Exercise-E
Multiple Choice Questions:
1. The maximum length of a pencil that can be kept in a rectangular pencil box of dimensions 12 cmx9 cmx8
cm, is:
(a) 13 cm
(b) 17 cm
(c) 18 cm
(d) 19 cm
2. The volume of a cube is 343 cm3. Its total surface area is:
(a) 196 cm2
(b) 49 cm2
(c) 294 cm2
(d) 147 cm2
3. How many cubes of 10 cm edge can be put in a cubical box of 1 medge?
(a) 10
(b) 100
(c) 1000
(d) 10000
264
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Math-8​

Answer 1

Answer:

100009100 q100 Oye I am to see if the for the update on a class at kitchen and