Chapter 15 Visualising Solid Shapes Exercise 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. (You may try to experiment first and then answer these questions).
Solution:
When the light falls just above the solids.
(i) A ball; the shadow looks like a circle.
(ii) A cylindrical pipe; the shadow looks like nearly rectangular.
(iii) A book; the shadow looks like nearly rectangular.
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!)
![](https://rajboardexam.in/wp-content/uploads/2022/07/image-310.png)
Solution:
(i) The given shadow corresponds to a sphere.
(ii) The given shadow corresponds to a cube.
(iii) The given shadow corresponds to a pyramid.
(iv) The given shadow corresponds to a cuboid or a cylinder.
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:
(i) The given statement is true.
(ii) The given statement is false.
![NCERT Solutions for Class 7 Maths Chapter 15 Visualising Solid Shapes Ex 15.4 Q1](http://104.199.181.145/wp-content/uploads/2022/04/ncert-solutions-for-class-7-maths-chapter-15-visua-34.png)
![NCERT Solutions for Class 7 Maths Chapter 15 Visualising Solid Shapes Ex 15.4 Q2](http://104.199.181.145/wp-content/uploads/2022/04/ncert-solutions-for-class-7-maths-chapter-15-visua-35.png)