1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects
Answer:
2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
| Objects | Opaque or Transparent or Translucent | Luminous or Non-luminous |
|---|---|---|
| Air | Transparent | Non-Luminous |
| Water | Transparent | Non-Luminous |
| A piece of rock | Opaque | Non-Luminous |
| A sheet of aluminium | Opaque | Non-Luminous |
| A mirror | Opaque | Non-Luminous |
| A wooden board | Opaque | Non-Luminous |
| A sheet of polythene | Translucent | Non-Luminous |
| A CD | Opaque | Non-Luminous |
| Smoke | Translucent | Non-Luminous |
| A sheet of plane glass | Translucent | Non-Luminous |
| Fog | Translucent | Non-Luminous |
| A piece of red hot iron | Opaque | Luminous |
| An umbrella | Opaque | Non-Luminous |
| A lighted flourescent tube | Opaque | Luminous |
| A wall | Opaque | Non-Luminous |
| A sheet of carbon paper | Opaque | Non-Luminous |
| The flame of a gas burner | Opaque | Luminous |
| A sheet of cardboard | Opaque | Non-Luminous |
| A lighted torch | Opaque | Luminous |
| A sheet of cellophane | Transparent | Non-Luminous |
| A wire mesh | - | Non-Luminous |
| Kerosene stove | Opaque | Luminous |
| Sun | Opaque | Luminous |
| Firefly | Opaque | Luminous |
| Moon | Opaque | Non-Luminous |
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?
Answer:
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?
Answer: In a completely dark room, we cannot see our reflection in the mirror. This is because, a source of light is needed for the mirror to reflect the image. As there is no light in the room, there would not be any reflection of light and no image will be formed in the mirror.
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