Which of the following objects is a good conductor of heat?  

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Bihar STET TGT (Science) Official Paper-I (Held On: 08 Sept, 2023 Shift 1)
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  1. Plastic
  2. Thermocol
  3. Wood Sawdust
  4. Glass

Answer (Detailed Solution Below)

Option 4 : Glass
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Bihar STET Paper 1 Mathematics Full Test 1
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Detailed Solution

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Explanation:

  •  The ability of a material to conduct heat is determined by its thermal conductivity.
  • Thermal conductivity is a measure of how well a material can transfer heat from one part to another.
  •  Plastic: Generally, plastics are poor conductors of heat. They have low thermal conductivity, meaning they do not transfer heat efficiently.
  •  Thermocol (Expanded Polystyrene):  Thermocol is also a poor conductor of heat. It is often used as an insulating material precisely because of its low thermal conductivity.
  •  Wood Sawdust:  Wood sawdust, like wood itself, is a poor conductor of heat. Wood has relatively low thermal conductivity, making it a good insulator.
  • Glass:  Glass is a better conductor of heat compared to the other materials listed.
  • It is not as good as metals, but it still conducts heat better than plastics or wood.
  • This is why glassware can become hot when filled with a hot liquid.
  • However, compared to metals, glass has relatively lower thermal conductivity. 
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