Introduction
Before trying to attempt to answer the NCERT exercise questions, you should have a thorough understanding of class 6 Science chapter 8 i.e. ‘Light, Shadows and Reflections‘.
If you haven’t understood the chapter yet, then worry not you can go through it easily and develop a crystal clear understanding of various concepts from our notes whose link has been provided below.
NCERT Exercise Questions & Answers
Que. 1 Rearrange the boxes given below to make a sentence that helps us understand
opaque objects
Ans. 1 OPAQUE OBJECTS MAKE SHADOWS
Que. 2 Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, a kerosene stove, a sun, a firefly, moon.
Ans. 2 The classification of the given objects into opaque, transparent, translucent, luminous and non-luminous is:
| Objects | Transparent | Translucent | Opaque | Luminous | Non-Luminous |
| Air | Yes | No | No | No | Yes |
| Water | Yes | No | No | No | Yes |
| A piece of rock | No | No | Yes | No | Yes |
| A sheet of aluminium | No | No | Yes | No | Yes |
| A mirror | No | No | Yes | No | Yes |
| A wooden board | No | No | Yes | No | Yes |
| A sheet of polyethene | No | Yes | No | No | Yes |
| A CD | No | No | Yes | No | Yes |
| Smoke | No | Yes | No | No | Yes |
| A sheet of plane glass | Yes | No | No | No | Yes |
| Fog | No | Yes | No | No | Yes |
| A piece of red hot iron | No | No | Yes | Yes | No |
| An umbrella | No | Maybe | Yes | No | Yes |
| A lighted fluorescent tube | No | No | Yes | Yes | No |
| A wall | No | No | Yes | No | Yes |
| A sheet of carbon paper | No | Maybe | Yes | No | Yes |
| The flames of a gas burner | No | Yes | No | Yes | No |
| A sheet of cardboard | No | No | Yes | No | Yes |
| A lighted torch | No | No | Yes | Yes | No |
| A sheet of cellophane | Yes | No | No | No | Yes |
| A wire mesh | No | Yes | No | No | Yes |
| A kerosene stove | No | No | Yes | Yes | No |
| Sun | No | No | Yes | Yes | No |
| Firefly | No | No | Yes | Yes | No |
| Moon | No | No | Yes | No | Yes |
Que. 3 Can you think of creating a shape that would give a circular shadow if held in
one way and a rectangular shadow if held in another way?
Ans. 3 A solid cylinder will produce a circular shadow if held in one way and a rectangular shadow if held in another way.
Que. 4 In a completely dark room, if you hold up a mirror in front of you, will you see a
reflection of yourself in the mirror?
Ans. 4 No, we will not be able to see our reflection in a mirror in a completely dark room because there is no light present there for the reflection.
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