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).
(i)
(ii)
(iii)
Answer:
(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!)
(i)
Answer: Cricket ball, water bottle cap, CD, plate etc.
(ii)
Answer: Die, chalk box, square paper etc.
(iii)
Answer: Ice cream cone, Birthday cap etc.
(iv)
Answer: Book, keyboard, mobile etc.
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
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