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प्रश्न
The telephone wires break in winter.
उत्तर
Metals expand on heating (in summer) and contract on cooling (in winter). Therefore while putting up the wires between two poles, care is taken that they are kept tight while laying them in winter as they sag in summer due to expansion.
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संबंधित प्रश्न
Telephone wires are kept tight between the two poles in winter.
Alcohol expands ........... than water.
A given volume of alcohol and the same volume of water are heated from the room temperature to the same temperature then.
Name the three states of matter and distinguish them on the basis of their (i) volume, and (ii) shape
Distinguish between liquid and vapour (or gas) states of matter on the basis of the following factors
- Arrangement of molecules
- Inter-molecular separation
- Inter-molecular force, and
- Kinetic energy of molecules
Give two examples of the substances which expand on heating.
The gaps are left between the successive rails on a railway track.
A cement floor is laid in small pieces with gaps in between.
Complete the following sentence:
In a bimetal two metals of different _______ of _______ are used.
______ exists when two objects In thermal contact no longer affect each other’s temperature.
