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प्रश्न
Which of the following statements is not true?
विकल्प
Materials are grouped for convenience.
Materials are grouped to study their properties.
Materials are grouped for fun.
Materials are grouped according to their uses.
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उत्तर
Materials are grouped for fun.
Explanation:
Materials are not grouped for fun. They are grouped for convenience, to study their properties and according to their uses in systematic manner.
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संबंधित प्रश्न
Short Answer Type Question:
Mention some materials which are made up of paper.
Find the odd one.
brick, coir, silk cloth, pine apple
We cannot compress, cut or bend the rough materials easily.
Stone is transparent, while glass is opaque.
Chalk dissolves in water.
Sugar does not dissolve in water.
Smooth materials do not have ups and downs.
Match the substances in Column A with their applications given in Column B.
|
Column A |
Column B |
| (a) oxygen | (i) for making crackers |
| (b) copper | (ii) for disinfecting water |
| (c) sulphur | (iii) all living beings inhale during breathing |
| (d) iron | (iv) for making electric wires |
| (e) chlorine | (v) for making rails |
Complete the crossword given in the figure with the help of the clues.
Across
1. Which is generally hard, ductile, malleable and sonorous.
2. A metal is called so it can be drawn into wires.
3. Metal bells are used because of this property.
Down
4. A metal generally used for making jewellery.
5. A metal which is liquid at room temperature.
6. A metal which reacts with acid as well as base to form hydrogen gas.
7. Substances used to enhance the growth of plants.
8. Property by virtue of which metals can be beaten into thin sheets.
Pick one material from the following which is completely soluble in water.
