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प्रश्न
When can you say a material is waterproof material?
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उत्तर
Materials that do not allow water to pass through them are called waterproof materials.
Example: raincoat, aluminium foil of tablet strip.
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संबंधित प्रश्न
Short Answer Type Question:
What is the basis for sorting materials?
Select those objects from the following which shine:
Glass bowl, plastic toy, steel spoon, cotton shirt
A notebook has lustre while an eraser does not.
A piece of wood floats on water.
Sugar does not dissolve in water.
Smooth materials do not have ups and downs.
Which among the following is an example of dull material?
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.
Fill in the blanks to complete the following paragraph.
The name of the product formed in the reaction of sulphur and ______ is sulphur dioxide gas. When sulphur dioxide is dissolved in ______, sulphurous acid is formed. The sulphurous acid turns ______ litmus paper to ______. Generally oxides of ______ are acidic in nature.
After completing the paragraph, write two questions which you can raise on the basis of this information.
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 |
