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प्रश्न
Which of the following materials is not lustrous?
विकल्प
Gold
Silver
Wood
Diamond
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उत्तर
Wood
Explanation:
Wood is not a crystalline substance and has no lusture.
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संबंधित प्रश्न
Short Answer Type Question:
Mention some materials which are made up of paper.
Short Answer Type Question:
What is the reason for grouping materials?
We cannot compress, cut or bend the rough materials easily.
Look at the pictures and identify the materials by which they are made of:
(paper, clay, glass, wood, plastic, metal rubber, wax
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| ____________ | ____________ | ____________ | ___________ | _____________ |
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| ____________ | ____________ | ____________ | ____________ | ____________ |
Write whether the given materials are hard or soft.
| Wood | Eraser | Cotton |
| ______ | ______ | ______ |
Sort the given objects as rough or smooth.
| Wet soap | Coir | Feather | Stone |
| ______ | ______ | ______ | ______ |
| Glass ball | Paperboard | Sand paper | Plastic spoon |
| ______ | ______ | ______ | ______ |
Soft material ______.
Rubber band is an example of ______.
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.
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.
