New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 16

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IMPORTANT

Earn 100

Three cubes each of side $4 c m$ are placed together. Find the volume and surface area of the cuboid thus formed.

Important Questions on Volume and Surface Area of Solids

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 17

A rectangular water tank has

16200

litres of water. The floor of the water tank is

4.5 m \times 3 m

. Find the height of water in the tank.

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New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 18

In a shower,

6 c m

of rainfall was there. If the volume of water that fell on

1.5

hectares of land is

k m^{3}

, then find the value of

k

.

[

Hint:

1 hectare = 10000 m^{2}]

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 19

A rectangular room is

10 m

long,

6 m

wide and

5 m

high. It has two doors

1.5 m

by

2 m

each and two windows

2 m

by

1.8 m

each. Find the cost of white washing the walls and ceiling of the room at the rate

₹ 50 p e r m^{2}

.

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 20

The outer dimensions of a closed wooden box are

12 c m

by

10 c m

by

9 c m

. Thickness of wood is

1.5 c m

. Find the total cost of wood required to make the box, if

1 {c m}^{3}

of wood costs

₹ 3.00

.

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 21

Cubes

A, B

and

C

having edges

3 c m, 4 c m

and

5 c m

are melted and a new cube is formed. Find the edge of the new cube.

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New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 22

A birthday cake measuring

60 c m

by

40 c m

by

15 c m

was ordered for a party. If each child in the party enjoys

240 {c m}^{3}

of cake and the cake is finished, how many children attended the party?

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 23

A village having a population of

3600

, requires

125

litres of water per head per day. It has a tank

25 m

long,

18 m

broad and

5 m

high. For how many days the water of the tank will last?

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 24

Two cubes each of volume

512 {c m}^{3}

are joined end to end. The surface area of the resulting cuboid is

k {cm}^{2}

. Find the value of

k

.