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प्रश्न
To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.
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उत्तर
Yes, she can apply the same method to keep a glass of cold drink cool because wool is a poor conductor of heat.
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संबंधित प्रश्न
Fill in the blank
Heat is a form of _______.
Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum
In the past, people used to rub two wooden pieces together to light fire.
Analogy:
Movement of molecules:: Heat.
Heat energy:: ______.
When an electric current is passing through the conductor ______ energy is produced.
Match the following
| 1. | Heat | a. | Good absorber |
| 2. | Temperature | b. | Form of energy |
| 3. | Black surface | c. | Insulators |
| 4. | Rubber, cork | d. | The measure of hotness or coldness |
Assertion: Small gaps left between railway lines.
Reason: It allows for the contraction of rails during summer.
What is heat energy?
Which of the following is true?
Warm air is ______.
