# NCERT Solutions For Class 8 Maths Chapter 11 Mensuration Ex 11.3

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Textbook | NCERT |

Board | CBSE |

Category | NCERT Solutions |

Class | Class 8 |

Subject | Maths |

Chapter | Chapter 11 |

Exercise | Class 8 Chapter 11 Mensuration 11.3 |

Number of Questions Solved | 10 |

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

**NCERT TEXTBOOK EXERCISES**

**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 tarpauÂ¬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 = 6a^{2}

According to the question,

6a^{2}= 600

â‡’ a^{2} = 600/6

â‡’ a^{2} = 100

â‡’ a = âˆš100

â‡’ 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 â†’ Both have the same heights.

Difference â†’ 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.**

## NCERT Solutions for Class 8 Maths Chapter 11 Mensuration Exercise 11.3 PDF

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