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

HARD

7th ICSE

IMPORTANT

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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 Questions on Volume and Surface Area of Solids

HARD

7th ICSE

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

.

MEDIUM

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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.

MEDIUM

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IMPORTANT

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?

HARD

7th ICSE

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?

HARD

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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

.

MEDIUM

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 25

If the areas of three adjacent faces of a cuboid are

x, y, z

respectively, then the volume of the cuboid is

MEDIUM

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Exercise>Q 26

A cuboidal water tank contains

216

litres of water. Its depth is

\frac{1}{3}

of its length and breadth is

\frac{1}{2}

of

\frac{1}{3}

of the difference between length and depth. The length of the tank is:

EASY

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IMPORTANT

New Mathematics Today Class 7>Chapter 32 - Volume and Surface Area of Solids>Mental Maths>Q 1

If the volume of a cuboid whose dimensions are

18 cm \times 10 cm \times 8 cm

is

V {cm}^{3}

then find

V

.