These NCERT Solutions for Class 7 Maths Chapter 15 Visualising Solid Shapes Ex 15.4 Questions and Answers are prepared by our highly skilled subject experts.
NCERT Solutions for Class 7 Maths 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).
Answer:
When light falls just above the solid
(i) A ball, the shadow looks like a circle.
(ii) A cylinder pipe, the shadow looks like a rectangle.
(iii) A book, the shadow looks like nearly a rectangle.
Question 2.
Here are the shadow 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!)
(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.
Answer:
(i) The given statement is true.
(ii) The given statement is false.