NCERT Solutions for Class 7 Maths Chapter 15 - Visualising Solid Shapes

NCERT Solutions for Class 7 Maths Chapter 15 – Visualising Solid Shapes. Furthermore, here we’ve provided you with the latest solution for Class 7 Maths Chapter 15 – Visualising Solid Shapes. As a result here you’ll find solutions to all the exercises. This NCERT Class 7 solution will help you to score good marks in your exam.

Students can refer to our solution for NCERT Class 7 Maths Chapter 15 – Visualising Solid Shapes. The Chapter 15 Solution of NCERT will help students prepare for the exams and easily crack the exam. Below we’ve provided you with the exercise-wise latest solution.

NCERT Solutions for Class 7 Maths Chapter 15 – Visualising Solid Shapes Pdf Download

NCERT Solutions for Class 7 Maths Chapter 15 – Visualising Solid Shapes Wise Solution

Exercise 15.1 – Page 281 of NCERT
Exercise 15.2 – Page 285 of NCERT
Exercise 15.3 – Page 288 of NCERT
Exercise 15.4 – Page 289 of NCERT

NCERT Solutions for Class 7 Maths Chapter 15 – Visualising Solid Shapes Exercise 15.1 Solution

Here you’ll find NCERT Chapter 15 – Visualising Solid Shapes Exercise 15.1 Solution.
Exercise 15.1: Solutions of Questions on Page Number: 281

Q1: Identify the nets which can be used to make cubes (cut out copies of the nets and try it):

Answer:

The given net can be folded as follows.

When the faces that are in sky blue colour and in pink colour are folded to make a cube, they will be overlapping each other.

The given net can be folded as follows.

A cube can thus be formed in the above way.

The given net can be folded as follows.
A cube can thus be formed in the above way. (iv) The given net can be folded as follows.

A cube can thus be formed in the above way.

The given net can be folded as follows.

When the faces that are in blue colour and in red colour are folded to make a cube, they will be overlapping each other.

The given net can be folded as follows.

A cube can thus be formed in the above way.

Q2: Dice are cubes with dots on each face. Opposite faces of a die always have a total of seven dots on them.

Here are two nets to make dice (cubes); the numbers inserted in each square indicate the number of dots in that box.

Insert suitable numbers in the blanks, remembering that the number on the opposite faces should total to 7.

Answer:

The numbers can be inserted as follows so as to make the given net into a net of a dice.

It can be observed that the sum of the opposite faces is 7.

The numbers can be inserted as follows so as to make the given net into a net of a dice.

It can be observed that the sum of the opposite faces is 7.

Q3: Can this be a net for a die? Explain you answer

Answer:

The given net can be folded as follows.

It can be observed that the opposite faces of the dice so formed have 2 and 5, 1 and 4, 3 and 6 on them. The sum of the numbers on the opposite faces comes to 7, 5, 9 respectively. However, in case of a dice, the sum of the numbers on the opposite faces should be 7. Hence, this net is not of a dice.

Q4: Here is an incomplete net for making a cube. Complete it in at least two different ways. Remember that a cube has six faces. How many are there in the net here? (Give two separate diagrams. If you like, you may use a squared sheet for easy manipulation.)

Answer:

There are 3 faces in the given net. The given net can be completed as follows.

Q5: Match the nets with appropriate solids:

Answer:

Consider net (i). It can be folded as follows.

It is a net of a pyramid. Hence, (d) is the correct matching option. Consider net

(ii) It can be folded as follows.

It is a net of a cube. Hence, (a) is the correct matching option.

Consider net (iii). It can be folded as follows.

It is a net of a cylinder. Hence, (b) is the correct matching option. Consider net

(iv). It can be folded as follows.

It is a net of a cone. Hence, (c) is the correct matching option.

NCERT Solutions for Class 7 Maths Chapter 15 – Visualising Solid Shapes Exercise 15.2 Solution

Here you’ll find NCERT Chapter 15 – Visualising Solid Shapes Exercise 15.2 Solution.
Exercise 15.2: Solutions of Questions on Page Number: 285

Q1: Use isometric dot paper and make an isometric sketch for each one of the given shapes:
(i) (ii)

(iii) (iv)

Answer:

The isometric sketch of these figures can be drawn as follows.
(i)

(ii)

(iii) (iv)

Q2: The dimensions of a cuboid are 5 cm, 3 cm and 2 cm. Draw three different isometric sketches of this cuboid.

Answer:

3 isometric sketches of the given cuboid can be drawn as follows.

Q3: Three cubes each with 2 cm edge are placed side by side to form a cuboid. Sketch an oblique or isometric sketch of this cuboid.

Answer:

When three cubes, each of 2 cm edge, are placed side by side, a cuboid with dimensions as 6 cm, 2 cm, and 2 cm will be formed.

Isometric sketch Oblique sketch

Q4: Make an oblique sketch for each one of the given isometric shapes:

Answer:

The oblique sketch of these figures will be as follows.

Q5: Give (i) an oblique sketch and (ii) an isometric sketch for each of the following:

(a) A cuboid of dimensions 5 cm, 3 cm and 2 cm. (Is your sketch unique?).
(b) A cube with an edge 4 cm long.

Answer:

Oblique sketch

Isometric sketch

The sketch for the cuboid is not unique. The cuboid can also be drawn by taking the length as 3 cm or 2 cm. This will lead to a different view of the same cuboid.

NCERT Solutions for Class 7 Maths Chapter 15 – Visualising Solid Shapes Exercise 15.3 Solution

Here you’ll find NCERT Chapter 15 – Visualising Solid Shapes Exercise 15.3 Solution.
Exercise 15.3: Solutions of Questions on Page Number: 288

Q1: What cross-sections do you get when you give a

(i) vertical cut (ii) horizontal cut to the following solids?

(a) A brick (b) A round apple (c) A die

(d) A circular pipe (e) An ice cream cone

Answer:

A brick

We can give a vertical cut to a brick in the following way.

We can give a horizontal cut to a brick in the following way.

A round apple

We can give a vertical cut to a round apple in the following way.

We can give a horizontal cut to a round apple in the following way.

A die

We can give a vertical cut to a dice in the following way.

We can give a horizontal cut to a dice in the following way.

A circular pipe

We can give a vertical cut to a circular pipe in the following way.

We can give a horizontal cut to a circular pipe in the following way.

An ice cream cone

We can give a vertical cut to an ice cream cone in the following way.

We can give a horizontal cut to an ice cream cone in the following way.

NCERT Solutions for Class 7 Maths Chapter 15 – Visualising Solid Shapes Exercise 15.4 Solution

Here you’ll find NCERT Chapter 15 – Visualising Solid Shapes Exercise 15.4 Solution.
Exercise 15.4: Solutions of Questions on Page Number: 289

Q1: A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow. (You may try to experiment first and then answer these questions).

Answer:

The shapes of the shadows of these figures will be as follows.

A ball

The shape of the shadow of a ball will be a circle.

A cylindrical pipe

The shape of the shadow of a circular pipe will be a rectangle.

A book

The shape of the shadow of a book will be a rectangle.

Q2: Here are the shadows of some 3-D objects, when seen under the lamp of an overhead projector. Identify the solids (s) that match each shadow. (There may be multiple answers for these!)