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प्रश्न
What are the good and bad conductors of heat ? Give two examples of each.
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उत्तर
Good conductors. “The substances through which heat is easily conducted are called good conductors of heat.”
Example : Copper, iron.
Bad conductors. “The substances through which heat is not conducted easily are called bad conductors of heat or poor conductors of heat.”
Example : Wood, cloth.
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संबंधित प्रश्न
Write true or false for a given statement.
Kerosene contracts on heating.
Fill in the blank
In a thermometer, the commonly used liquid is _______
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The temperature of boiling water is _______
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Liquids expand _______ than the solids.
The fig. shows a glass tumbler containing hot milk which is placed in a tub of cold water. State the direction in which heat will flow.
Name two substances which expand on heating.
Name a solid which is a good conductor of heat.
In summer, ice is kept wrapped in a gunny bag. Explain the reason.
Match the following
| 1. | Solid to liquid | a. | Condensation |
| 2. | Liquid to gas | b. | Deposition |
| 3. | Gas to solid | c. | Melting |
| 4. | Gas to liquid | d. | Vaporization |
______ is greater for liquids than solids and it is maximum in gases.
