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प्रश्न
Stone is transparent, while glass is opaque.
विकल्प
True
False
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उत्तर
This statement is False.
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संबंधित प्रश्न
Short Answer Type Question:
What is the reason for grouping materials?
Long Answer Type Question:
‘Grouping of objects helps the shopkeeper.’ Justify the statement.
Write whether the given materials are hard or soft.
| Wood | Eraser | Cotton |
| ______ | ______ | ______ |
When can you say a material is waterproof material?
A notebook has lustre while an eraser does not.
Soft materials can be early compressed.
Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?
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.
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.
Which of the following materials is not lustrous?
