RBSE Solutions for Class 7 Maths Chapter 15 Visualising Solid Shapes Ex 15.4

Rajasthan Board RBSE Solutions for Class 7 Maths Chapter 15 Visualising Solid Shapes Ex 15.4 Textbook Exercise Questions and Answers.

RBSE Class 7 Maths Solutions Chapter 15 Visualising Solid Shapes Ex 15.4

Question 1.
A bulb is kept liting just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadows. (You may try to experiment first and then answer these questions.)
(i)

Answer:
When light falls just above the solid:
A ball; the shadow will be like a circle.

(ii)

Answer:
When light falls just above the solid :
A cylinder pipe; the shadow will be like a rectangle.

(iii)

Answer:
When light falls just above the solid :
A book; the shadow will be 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 answer for these!)
(i)
A circle

Answer:
Sphere

(ii)
A square

Answer:
Cube

(iii)
A triangle

Answer:
Cone

(iv)
A rectangle

Answer:
Cuboid

Question 3.
Examine if the following are true statements :
(i) The cube can cast a shadow in the shape of a rectangle.
Answer:
True

(ii) The cube can cast a shadow in the shape of a hexagon.
Answer:
False