In **Online Education** NCERT Solutions for Class 8 Maths Chapter 11 Mensuration Ex 11.3 are part of NCERT Solutions for Class 8 Maths. Here we have given NCERT Solutions for Class 8 Maths Chapter 11 Mensuration Ex 11.3.

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 8 |

Subject |
Maths |

Chapter |
Chapter 11 |

Chapter Name |
Mensuration |

Exercise |
Ex 11.3 |

Number of Questions Solved |
10 |

Category |
NCERT Solutions |

## Online Education NCERT Solutions for Class 8 Maths Chapter 11 Mensuration Ex 11.3

**Question 1.**

There are two cuboidal boxes as shown in the adjoining figure. Which box requires the lesser amount of material to make?

**Solution.**

**Question 2.**

A suitcase with measures 80 cm x 48 cm x 24 cm is to be covered with a tarpau¬lin cloth. How many meters of tarpaulin of width 96 cm is required to cover 100 such suitcases?

**Solution.**

**Question 3.**

Find the side of a cube whose surface area is 600 \({ cm }^{ 2 }\).

**Solution.**

Let the side of the cube be a cm.

Then, Total surface area of the cube = 6\({ a }^{ 2 }\)

According to the question,

6\({ a }^{ 2 }\)= 600

⇒ \({ a }^{ 2 }\) = \(\frac { 600 }{ 6 } \)

⇒ \({ a }^{ 2 }\) = 100

⇒ a = \(\sqrt { 100 } \)

⇒ a = 10 cm

Hence, the side of the cube is 10 cm.

**Question 4.**

Rukhsar painted the outside of the cabinet of measure 1 m x 2 m x 1.5 m. How much surface area did she cover if she painted all except the bottom of the cabinet?

**Solution.**

**Question 5.**

Daniel is painting the walls and ceiling of a cuboidal hall with length, breadth, and height of 15 m, 10 m and 7 m respectively. From each can of paint 100 \({ m }^{ 2 }\) of area is painted.

How many cans of paint will she need to paint the room?

**Solution.**

l = 15 m

b = 10 m

h = 7 m

Surface area to be painted

Hence, she will need 5 cans of paint to paint the room.

**Question 6.**

Describe how the two figures at the right are alike and how they are different. Which box has a larger lateral surface area?

**Solution.**

Similarity → Both have the same heights.

Difference → One is a cylinder, the other is a cube;

The cylinder is a solid obtained by revolving a rectangular area about its one side whereas a cube is a solid enclosed by six square faces; a cylinder has two circular faces whereas a cube has six square faces.

**Question 7.**

A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How many sheets of metal is required?

**Solution.**

**Question 8.**

The lateral surface area of a hollow cylinder is 4224 \({ cm }^{ 2 }\). It is cut along its height and formed a rectangular sheet of width 33 cm. Find the perimeter of rectangular sheet?

**Solution.**

Lateral surface area of the hollow cylinder = 4224 \({ cm }^{ 2 }\)

**Question 9.**

A road roller takes 750 complete revolutions to move once over to level a road. Find the area of the road if the diameter of a road roller is 84 cm and length is 1 m.

**Solution.**

Diameter of the road roller = 84 cm

**Question 10.**

A company packages its milk powder in the cylindrical container whose base has a diameter of 14 cm and height 20 cm. The company places a label around the surface of the container (as shown in the figure). If the label is placed 2 cm from top and bottom, what is the area of the label?

**Solution.**

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