'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 7

MEDIUM

8th CBSE

IMPORTANT

Earn 100

Water is falling in a cylindrical tank from an inlet pipe at the rate of $10 litres$ per minute. If the diameter and height of the tank are $1 m and 7 m$ , respectively, find the time required to fill the tank.

Important Questions on Surface Area and Volume

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 8

Find the cost of digging a pit (to form a well) of diameter

3 m

and depth

21 m

at the rate of

₹ 5

per

m^{3}

.

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 9

The volume of a cuboid is

528 c m^{3}

and the area of its base is

88 c m^{2}

. Find its height.

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 10

How many bricks will be required to construct a wall

10 m

long,

4 d m

wide and

3 m

high, if each brick measures

25 c m \times 12 c m \times 8 c m

?

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 11

Three cubes whose edges are

6 c m, 8 c m

and

10 c m

, respectively, are melted without any loss of metal into a single cube. Find the edge of the new cube.

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 12

A reservoir is in the form of a cuboid. Its length is

20 m

. If

18 k L

of water is removed from the reservoir, the water level goes down by

15 c m

. Find the width of the reservoir

[1 k L = 1 m^{3}]

.

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 13

A river

3 m

deep and

40 m

wide is flowing at the rate of

2.5

km per hour. How much water will fall into the sea in a minute?

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 14

The dimensions of a field are

15 m

and

12 m

. An

8 m

long,

2.5 m

wide and

2 m

deep pit is dug in one corner of the field and the earth removed from this pit is evenly spread over the remaining area of the field. Calculate by how much the level of the field is raised.

MEDIUM

8th CBSE

IMPORTANT

'I Did It' Mathematics>Chapter 12 - Surface Area and Volume>Exercise 12.2>Q 15

The external length, breadth and height of a closed rectangular wooden box are

20 c m, 12 c m and 6 c m

, respectively, and thickness of wood is

0.5 c m

. Find the volume of the wood.