RBSE Solutions for Class 7 Maths Chapter 12 Visualizing Solid Shapes In Text Exercise is part of RBSE Solutions for Class 7 Maths. Here we have given Rajasthan Board RBSE Class 7 Maths Chapter 12 Visualizing Solid Shapes In Text Exercise.
| Board | RBSE |
| Textbook | SIERT, Rajasthan |
| Class | Class 7 |
| Subject | Maths |
| Chapter | Chapter 12 |
| Chapter Name | Visualizing Solid Shapes |
| Exercise | In Text Exercise |
| Number of Questions | 11 |
| Category | RBSE Solutions |
Rajasthan Board RBSE Class 7 Maths Chapter 12 Visualizing Solid Shapes In Text Exercise
Do and Learn
(Page 137)
Question 1
Some statements and diagrams (RBSESolutions.com) of shapes are given below.
Write down which statement is correct for every shape.
(i) I have six rectangular faces.
(ii) I have only one surface and which is also curved.
(iii) All my faces are square.
(iv) One of my faces is curved and two faces are plane.
(v) One of m faces is curved and one face is plane.
Solution:
| Shapes | True Statement |
| Cuboid | (i) I have six rectangular faces |
| Cube | (ii) My all faces are in square shape |
| Cylinder | (iii) My one face is curved and two faces are plane. |
| Cone | (iv) My one face is curved and one face is plane. |
| Sphere | (v) I have only one surface and which is also curved. |
Question 2
Fill the table
| S.N | Figure | No. of surfaces | Type of surfaces | |
| Plane | Curve | |||
| 1. | Cube | |||
| 2. | Cuboid | |||
| 3. | Cylinder | 3 | Plane-2 | Curve-1 |
| 4. | Cone | |||
| 5. | Sphere | |||
Solution:
| S.N | Figure | No. of surfaces | Type of surfaces | |
| Plane | Curve | |||
| 1. | Cube | 6 | 6 | – |
| 2. | Cuboid | 6 | 6 | – |
| 3. | Cylinder | 3 | Plane-2 | Curve-1 |
| 4. | Cone | 2 | 1 | 1 |
| 5. | Sphere | 1 | – | 1 |
(Page 138)
Question 1
Cut Similar type of net and make (RBSESolutions.com) square shape boxes.
Solution:
Question 2
To make a cylindrical shape of box make a jalak.
Solution:
(Page 141)
Activity 1:
Slicing (Cutting to pieces) Game
Here is a loaf of bread. It is (RBSESolutions.com) like a cuboid with a square face. You ‘slice’ it with a knife. When you give a ‘vertical’ cut, you get several pieces. Each face of the piece is a square. We call this face a ‘cross-section’ of the whole bread. The cross section is nearly a square in this case.
If your cut is not ‘vertical’ then you may get a different cross section. Think about it.
Similarly you noticed cross-sections of some vegetables when they are cut for the purpose of cooking in the kitchen. Observe the various slices and get aware of the shapes that result as cross sections.
Question 1
What is the shape (RBSESolutions.com) of the bread face?
Answer:
It is in square shape.
Question 2
What is the name of this square shape face of Bread?
Answer:
Square shape bread piece is called the cross section of bread.
Question 3
If Bread is cutted in the (RBSESolutions.com) horizontal direction then, what does is called.
Answer:
Cross section
Activity 2:
A shadow play Shadows are a good way to illustrate how three dimensional objects can be viewed in two dimensions. It is a form of entertainment using solid articulated figures in front of an illuminated back drop to create the illusion of moving images.You will need an over-head projector or a torch and a few solid shapes to understand this activity. Keep a torch light, right in front of a cone.
Question 1
What type of shadow does (RBSESolutions.com) it cast on the screen?
Answer:
On the screen triangle shape shadow is appeared.
Question 2
If, instead of a cone, you place a cube in the above game, what type of shadow you will get?
Answer:
We will get shadow of square.
Question 3
If lighting source is shifted in other direction and change (RBSESolutions.com) the position of solid what will the impact on image of shadow.
Answer:
Shape and size both will be changed.
Question 4
Study the shadows of different shapes and sizes of trees, buildings etc. in relation to the position of the sun (morning, noon and evening).
Answer:
Morning : Shadow is quite big and slowly it decreases.
Noon : (when sum is on the top) shadow is very (RBSESolutions.com) small and it increases slowly.
Evening : Shadow is biggest in the evening.
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