NCERT Exemplar Class 8 Maths Solutions for Chapter 6 - Visualising Solid Shapes

NCERT Exemplar Class 8 Maths Chapter 6 Visualising Solid Shapes, is provided here for students to prepare for exams. These exemplars solutions are designed by experts in accordance with CBSE syllabus(2020-2021), which cover all the topics of Maths Chapter 6 of 8th standard.

The chapter visualizing solid shapes is about learning different types of shapes in 2 and 3 dimensions. To master the concepts of this chapter students are advised to solve the questions from the NCERT exemplar problems for Class 8 maths visualizing solid shapes.

Class 8 NCERT Exemplar For Visualising Solid Shapes

Solve exemplar problems for class 8, as it will help you to understand the concepts present in each chapter of Maths as well as Science subjects. Below is the list of topics covered in Chapter 6 of the 8th class.

  • Difference between 2D and 3D figures
  • Different types of 3D shapes
  • Faces, Edges and Vertices

Apart from these exemplars, we provide notes, exemplar books, NCERT Maths solutions for 8th standard and question papers to help students practice well for final exams. Students are advised to solve sample papers and previous year question papers which gives an idea of types of questions asked in the board exam from Visualising Solid Shapes.

NCERT Exemplar Class 8 Maths Solutions Chapter 6 Visualising Solid Shapes:-Download PDF Here

NCERT Exemplar Class 8 Maths Solutions Chapter 6 Visualising Solid Shapes
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Access NCERT Exemplar Solutions for Class 8 Maths Chapter 6

Exercise Page: 181

In each of the questions 1 to 21, out of four options only one is correct. Write the correct answer.

1. Which amongst the following is not a polyhedron?

NCERT Exemplars Class 8 Maths Chapter 6 Image1

Solution:-

(c)

By the definition a polyhedron is regular if its faces are congruent regular polygons and the same number of faces meet at each vertex.

2. Which of the following will not form a polyhedron?

(a) 3 triangles (b) 2 triangles and 3 parallelogram

(c) 8 triangles (d) 1 pentagon and 5 triangles

Solution:-

(a) 3 triangles

3 triangles will not form a polyhedron because it must have more than four faces. So, it is not possible in 3 triangles which have 3 faces only.

3. Which of the following is a regular polyhedron?

(a) Cuboid (b) Triangular prism

(c) Cube (d) Square prism

Solution:-

(c) Cube

Because, a cube is a platonic solid because all six of its faces are congruent squares.

4. Which of the following is a two Dimensional figure?

(a) Rectangle (b) Rectangular Prism

(c) Square Pyramid (d) Square Prism

Solution:-

(a) Rectangle

Rectangle is a two dimensional figure. It has length and breadth.

5. Which of the following can be the base of a pyramid?

(a) Line segment (b) Circle (c) Octagon (d) Oval

Solution:-

(c) Octagon

A pyramid is a polyhedron whose base is a polygon and lateral faces are triangles.

6. Which of the following 3D shapes does not have a vertex?

(a) Pyramid (b) Prism (c) Cone (d) Sphere

Solution:-

Sphere.

The faces meet at edges which are line segments and the edges meet at a point called vertex. Since, a sphere has no vertex and no edges.

7. Solid having only line segments as its edges is a

(a) Polyhedron (b) Cone (c) Cylinder (d) Polygon

Solution:-

(a) Polyhedron

A polyhedron is formed by four or more polygons that intersect only at their edges. The faces of a regular polyhedron are all congruent regular polygons and the same number of faces intersect at each vertex.

8. In a solid if F = V = 5, then the number of edges in this shape is

(a) 6 (b) 4 (c) 8 (d) 2

Solution:-

(c) 8

We have,

Euler’s formula for any polyhedron is, F + V – E = 2

Given, F = V = 5

Where, face (F) = 5, Vertex (V) = 5, Edge (E) =?

Then,

5 + 5 – E = 2

10 – E = 2

10 – 2 = E

Edges (E) = 8

9. Which of the following is the top view of the given shape?

NCERT Exemplars Class 8 Maths Chapter 6 Image 2

Solution:-

(a)

NCERT Exemplars Class 8 Maths Chapter 6 Image 3

10. The net shown below can be folded into the shape of a cube. The face marked with the letter L is opposite to the face marked with which letter?

NCERT Exemplars Class 8 Maths Chapter 6 Image 4

(a) M (b) N (c) Q (d) O

Solution:-

(a) M

NCERT Exemplars Class 8 Maths Chapter 6 Image 5

11. Which of the nets given below will generate a cone?

NCERT Exemplars Class 8 Maths Chapter 6 Image 6

Solution:-

(a) Has circular base, which gives a cone.

12. Which of the following is not a prism?

NCERT Exemplars Class 8 Maths Chapter 6 Image 7

Solution:-

(b)

By observing option (b) figure, bottom and top faces are not congruent polygons.

13. We have 4 congruent equilateral triangles. What do we need more to make a pyramid?

(a) An equilateral triangle.

(b) A square with same side length as of triangle.

(c) 2 equilateral triangles with side length same as triangle.

(d) 2 squares with side length same as triangle.

Solution:-

(b) A square with same side length as of triangle.

We have to add a square with same side length as of triangle to make a pyramid. As we know a pyramid is a polyhedron whose base is a polygon and lateral faces are triangles.

14. Side of a square garden is 30 m. If the scale used to draw its picture is 1cm: 5m, the perimeter of the square in the picture is

(a) 20 cm (b) 24 cm (c) 28 cm (d) 30 cm

Solution:-

(b) 24 cm

Given, side of a square garden = 30m

Scale to draw garden picture is 1cm: 5m

So, perimeter of the square garden is = 4 × 30

= 120m

Then,

Perimeter to draw garden in picture = 120/5

= 24 cm

15. Which of the following shapes has a vertex.

NCERT Exemplars Class 8 Maths Chapter 6 Image 8

Solution:-

(c)

The edges meet at a point called vertex.

16. In the given map, the distance between the places is shown using the scale 1 cm: 0.5 km. Then the actual distance (in km) between school and the book shop is

NCERT Exemplars Class 8 Maths Chapter 6 Image 9

(a) 1.25 (b) 2.5 (c) 2 (d) 1.1

Solution:-

Given, Scale = 1 cm: 0.5km

Then the actual distance between school and the book shop is = 2.2 × 0.5

= 1.1 cm

17. Which of the following cannot be true for a polyhedron?

(a) V = 4, F = 4, E = 6 (b) V = 6, F = 8, E = 12

(c) V = 20, F = 12, E = 30 (d) V = 4, F = 6, E = 6

Solution:-

(d) V = 4, F = 6, E = 6

We have,

Euler’s formula for any polyhedron is, F + V – E = 2

Where, face (F) = 6, Vertex (V) = 4, Edge (E) =6

Then,

6 + 4 – 6 = 2

LHS 6 + 4 -6

10 – 6

4

RHS= 2

By comparing LHS and RHS

LHS ≠ RHS

18. In a blueprint of a room, an architect has shown the height of the room as 33 cm. If the actual height of the room is 330 cm, then the scale used by her is

(a) 1:11 (b) 1:10 (c) 1:100 (d) 1:3

Solution:-

(b) 1: 10

From the question it is given that,

An architect has shown the height of the room as 33 cm

The actual height of the room is 330 cm

Then, the scale used by an architect is = Drawn size/actual size

= 33/330 … [divide both by 33]

= 1/10

= 1: 10

19. The following is the map of a town. Based on it answer question 19-21.

NCERT Exemplars Class 8 Maths Chapter 6 Image 10

The number of hospitals in the town is

(a) 1 (b) 2 (c) 3 (d) 4

Solution:-

(b) 2

20. The ratio of the number of general stores and that of the ground is

(a) 1 : 2 (b) 2 : 1 (c) 2 : 3 (d) 3 : 2

Solution:-

(d) 3: 2

By observing the given map,

The number of general stores = 6

The number of ground = 4

Then,

The ratio of the number of general stores and that of the ground is = 6/4

= 3/2

= 3: 2

21. According to the map, the number of schools in the town is

(a) 4 (b) 3 (c) 5 (d) 2

Solution:-

(c) 5

In questions 22 to 41, fill in the blanks to make the statements true.

22. Square prism is also called a _______.

Solution:-

Square prism is also called a cube.

A cube is a platonic solid because all six of its faces are congruent squares.

23. Rectangular prism is also called a ________.

Solution:-

Rectangular prism is also called a Cuboid.

NCERT Exemplars Class 8 Maths Chapter 6 Image 11

24. In the figure, the number of faces meeting at B is ________.

Solution:-

The number of faces meeting at B is 4.

25. A pyramid on an n sided polygon has ______ faces.

Solution:-

A pyramid on an n sided polygon has n+1 faces.

26. If a solid shape has 12 faces and 20 vertices, then the number of edges in this solid is ______.

Solution:-

If a solid shape has 12 faces and 20 vertices, then the number of edges in this solid is 30.

We have,

Euler’s formula for any polyhedron is, F + V – E = 2

Given, F = 12, V = 20

Where, face (F) = 12, Vertex (V) = 20, Edge (E) =?

Then,

12 + 20 – E = 2

32 – E = 2

32 – 2 = E

Edges (E) = 30

NCERT Exemplars Class 8 Maths Chapter 6 Image 12

27. The given net can be folded to make a ______.

Solution:-

The given net can be folded to make a prism.

NCERT Exemplars Class 8 Maths Chapter 6 Image 13

28. A solid figure with only 1 vertex is a ______.

Solution:-

A solid figure with only 1 vertex is a cone.

NCERT Exemplars Class 8 Maths Chapter 6 Image 14

29. Total number of faces in a pyramid which has eight edges is______.

Solution:-

Total number of faces in a pyramid which has eight edges is 5.

NCERT Exemplars Class 8 Maths Chapter 6 Image 15

30. The net of a rectangular prism has ______ rectangles.

(Hint: Every square is a rectangle but every rectangle is not a square.)

Solution:-

The net of a rectangular prism has six rectangles.

NCERT Exemplars Class 8 Maths Chapter 6 Image 16

31. In a three-dimensional shape, diagonal is a line segment that joins two vertices that do not lie on the ______ face.

Solution:-

In a three-dimensional shape, diagonal is a line segment that joins two vertices that do not lie on the same face.

32. If 4 km on a map is represented by 1 cm, then 16 km is represented by ______ cm.

Solution:-

If 4 km on a map is represented by 1 cm, then 16 km is represented by 4 cm.

= 16/4

= 4 cm

33. If actual distance between two places A and B is 110 km and it is represented on a map by 25 mm. Then the scale used is ______.

Solution:-

If actual distance between two places A and B is 110 km and it is represented on a map by 25 mm. Then the scale used is 1: 4400000

From the question it is given that,

Actual distance between two places A and B is = 110km

Distance is represented on a map by = 25 mm

So, the scale used is = Size drawn on map/ actual distance

= 25 mm/110 km

We know that, 1km = 1000m

1m = 100cm

1cm = 10mm

1 km = 10,00,000

So, 110km = 11,00,00,000 mm

Therefore = 25/11,00,00,000

= 1/4400000

= 1: 4400000

NCERT Exemplars Class 8 Maths Chapter 6 Image 17

34. A pentagonal prism has ______ faces.

Solution:-

A pentagonal prism has 7 faces.

35. If a pyramid has a hexagonal base, then the number of vertices is ______.

Solution:-

If a pyramid has a hexagonal base, then the number of vertices is 7.

NCERT Exemplars Class 8 Maths Chapter 6 Image 18

 

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