1. 

A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is:

A. 3.6 kg
B.

3.696 किलो

C.

36 किलो

D.

36.9 किलो


2. 

A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:

A. 720
B.

900

C.

1200

D.

1800


3. 

66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:

A. 84
B.

90

C.

168

D.

336


4. 

A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

A. 12 cm3
B.

15 सेमी 3

C.

16 सेमी 3

D.

20 सेमी 3


5. 

In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is:

A. 75 cu. m
B.

750 घन मीटर

C.

7500 घन मीटर

D.

75000 घन मीटर