MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4

Question 1.
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.
MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4 1
Solution:
The shapes of the shadows of these figures will be as follows.
(i) A ball
MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4 2
The shape of the shadow of a ball will be a circle.

(ii) A cylindrical pipe
MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4 3
The shape of the shadow of a cylindrical pipe will be a rectangle.

(iii) A book
MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4 4
The shape of the shadow of a book will be a rectangle.

MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4

Question 2.
Here are the shadows of some 3-D objects, when seen under the lamp of an overhead projector. Identify the solid(s) that match each shadow. (There may be multiple answers for these!)
MP Board Class 7th Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4 5
Solution:
The given shadows can be obtained in case of the following objects.
(i) Compact disk
(ii) A dice
(iii) Triangular pyramid
(iv) NoteBook

Question 3.
Examine if the following are true statements:
(i) The cube can cast a shadow in the shape of a rectangle.
(ii) The cube can cast a shadow in the shape of a hexagon.
Solution:
A cube can cast a shadow only in the shape of a square. Therefore, any other shape is not possible.

MP Board Class 7th Maths Solutions