Gujarat Board GSEB Textbook Solutions Class 7 Maths Chapter 15 Visualising Solid Shapes Ex 15.4 Textbook Questions and Answers.

## Gujarat Board Textbook Solutions Class 7 Maths 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. (You may try to experiment first and then answer these questions).

Solution:

When light falls just above the solid, i.e.

(i) A ball, the shadow looks like a circle.

(ii) A cylindrical pipe, the shadow looks like a rectangle.

(iii) A book, the shadow looks like nearly a rectangle.

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!)

Solution:

(i) The given shadow corresponds to a sphere.

(ii) The given shadow corresponds to a cube.

(iii) The given shadow corresponds to a cone.

(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.