Properties of Materials: Sonority, Conduction, Ductility and Brittleness: 30 flashcards
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1. What is sonority?
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The property of metals that enables them to produce a ringing sound when struck.
2. Which materials produce a dull sound when struck?
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Coal and wood produce dull sounds, not ringing sounds.
3. Are metals sonorous in nature?
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Yes, metals are said to be sonorous in nature.
4. Why does a school bell ring?
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Because it is made of metal, which is sonorous.
5. What is conduction?
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The transfer of heat from one point to another within a material.
6. What are conductors?
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Materials that allow heat to pass through them.
7. Are metals good conductors of heat?
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Yes, metals are good conductors of heat.
8. Is wood a good conductor of heat?
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No, wood is a poor conductor of heat.
9. In Activity 4.3, which spoon gets hotter?
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The metal spoon gets hotter than the wooden spoon.
10. Why are cooking vessels made of metals?
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Because heat must travel quickly from the flame to the food.
11. Why are cooking vessel handles made of wood?
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Because wood is a poor conductor, so the handle stays cool to hold.
12. Are metals good conductors of electricity?
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Yes, metals are good conductors of electricity.
13. Name some poor conductors of electricity.
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Rubber, plastic, dry wood, stone and nylon are poor conductors.
14. Why do electricians wear rubber gloves and rubber-soled shoes?
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Because rubber does not conduct electricity, so it protects them from shocks.
15. What is a tester circuit used for?
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To check whether a material conducts electricity.
16. If the bulb glows in a tester circuit, what does it mean?
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The material is a conductor of electricity.
17. What is ductility?
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The property of materials by which they can be drawn into wires.
18. Which property is mainly possessed by metals?
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Ductility is mainly possessed by metals.
19. Where are copper and aluminium wires used?
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In electrical fittings.
20. Name musical instruments that use metal wires as strings.
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Veena, sitar, violin and guitar.
21. How ductile is gold?
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One gram of gold can be drawn into a wire about 2 kilometres long.
22. What is malleability?
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The property of being beaten into thin sheets.
23. What does brittle mean?
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Materials that break into pieces when hit, such as coal and sulfur.
24. Is wood malleable or brittle?
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Wood is neither malleable nor brittle.
25. Which metals did the Harappans use?
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The Harappans used copper and gold.
26. Why were iron ploughs superior to earlier tools?
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Because iron is strong, making ploughs much stronger and more productive.
27. Why was copper likely discovered earlier than iron?
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Copper occurs in native (pure) form, while iron is usually found in ores.
28. What sound do coal and wood produce when struck?
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A dull sound.
29. What is the ringing sound of ghungroos due to?
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The sonority of metals.
30. Give an example of a metal object that rings when struck.
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A metal spoon, metal coin, school bell or temple bell.
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