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- Delhi, India
Question 1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
Question 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, kerosene stove, sun, firefly, moon.
Answer:-
| Object | Opaque | Transparent | Translucent | Luminous | Non-luminous |
| Air | – | Yes | – | – | Yes |
| Water | – | Yes | – | – | Yes |
| Piece of rock | Yes | – | – | – | Yes |
| Sheet of aluminium | Yes | – | – | – | Yes |
| Mirror | Yes | – | – | – | Yes |
| Wooden board | Yes | – | – | – | Yes |
| Sheet of polythene | – | – | Yes | – | Yes |
| CD | – | – | Yes | – | Yes |
| Smoke | – | – | Yes | – | Yes |
| Sheet of plane glass | – | Yes | – | – | Yes |
| Fog | – | – | Yes | – | Yes |
| Piece of red hot iron | Yes | – | – | Yes | – |
| Umbrella | Yes | – | – | – | Yes |
| Lighted fluorescent tube | Yes | – | – | Yes | – |
| Wall | Yes | – | – | – | Yes |
| Sheet of carbon paper | Yes | – | – | – | Yes |
| Flame of a gas burner | – | – | Yes | Yes | – |
| Sheet of cardboard | Yes | – | – | – | Yes |
| Lighted torch | Yes | – | – | Yes | – |
| Sheet of cellophane | – | – | Yes | – | Yes |
| Wire mesh | – | – | Yes | – | Yes |
| Kerosene stove | Yes | – | – | Yes | – |
| Sun | Yes | – | – | Yes | – |
| Firefly | Yes | – | – | Yes | – |
| Moon | Yes | – | – | – | Yes |
Question 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:- Yes, a cyclinder or a circular disc when held in one way give a circular shadow and a rectangular shadow if held in another way.
Question 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 no image will be formed as there will be no reflection of light.
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