Volume of Hollow Cylinder

Q.

A hollow cylindrical pipe is 210 cm long. Its outer and inner diameters are 10 cm and 6 cm respectively. The volume of the copper used in making the pipe is

1. $10560{cm}^3$

2. $10460{cm}^3$

3. $10570{cm}^3$

4. $10260{cm}^3$

Q.

What is the volume of material required to make a hollow cylinder having inner and outer radius as 2 cm and 3 cm respectively and height as 14 cm?

1. $572c{m}^3$
   

2. $176c{m}^3$
   

3. $396c{m}^3$
   

4. $220c{m}^3$

Q. Volume of a hollow cylinder of height 'h', outer radius 'R' and inner radius 'r' is $\pi (R^2-r^2)h$.

1. True
2. False

Q. Volume of a hollow cylinder of height 'h', outer radius 'R' and inner radius 'r' is $\pi (R^2-r^2)h$.

1. True
2. False

Q.

A metal place has a bore (inner diameter) of 5 cm.The pipe is 5 mm thick all around.Find the weight, in kilogram, of 2 meters of the pipe if $1c{m}^3$ of the metal weighs 7.7 g.

Q.

A hollow cylinder has solid hemisphere inward at one end and on the other end it is closed with a flat circular plate. The height of water is 10 cm when flat circular surface is downward. Find the level of water, when it is inverted upside down, common diameter is 7 cm and height of the cylinder is 20 cm.

Q.

What length of solid cylinder 2 cm in diameter must be taken to recast into a hollow cylinder of external diameter 20 cm, 0.25 cm thick and 15 cm long?

Q. A hollow iron pipe of $21cm$ long and its external diameter is $8cm$. If the thickness of the pipes is $1cm$ and iron weights $8g/c{m}^2$, then the weight of the pipe is equal to

1. $3.6kg$
2. $3.696kg$
3. $36.9kg$
4. $36kg$

Q. A well is to be dug $20$ m deep, $2.25$ m inside diameter, with a brick lining of $0.35$ m thickness. Then the quantities of brickwork is

1. $57.2m^3$
2. $14.75m^3$
3. $136.75m^3$
4. $572m^3$

Q.