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प्रश्न
Boojho found a bag containing the following materials.
- Mirror
- Paper stained with oil
- Magnet
- Glass spectacles
Help Boojho in finding out the material(s) which is/ are opaque.
विकल्प
(i) only
(iv) only
(i) and (iii)
(ii) and (iv)
उत्तर
(i) and (iii)
Explanation -
Mirror is opaque since it is painted on one side. Magnet is opaque since it is made up of iron metal.
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संबंधित प्रश्न
Very Short Answer Type Question:
Name two objects which are made from opaque materials.
Very Short Answer Type Question:
List three liquids which are transparent.
Short Answer Type Question:
Mention some materials which are made up of paper.
Short Answer Type Question:
Why is water important for our body?
Sand paper is a good example for smooth materials.
Test the flexibility.
Give one plastic scale and a wooden scale to the students. Ask them to bend. Tabulate their observation (bends, does not bend).
| Plastic Scale | Wooden Scale |
| ______ | ______ |
When can you say a material is waterproof material?
Soft materials can be early compressed.
Some of the following statements are incorrect. Find the incorrect statements and correct them.
- The property of metals by virtue of which they can be drawn into wires is called ductility.
- Metals are good conductors of electricity but poor conductor of heat.
- Articles made up of metals produce ringing sound when struck hard.
- Oxides of non-metals and metals are acidic in nature.
- A less reactive metal displaces a more reactive metal from its salt solution in water.
Match the objects given in Column I with the materials given in Column II.
| COLUMN I | COLUMN II | ||
| (a) | Surgical instruments |
(i) | Plastic |
| (b) | Newspaper | (ii) | Animal product |
| (c) | Electrical switches | (iii) | Steel |
| (d) | Wool | (iv) | Plant product |
