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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
All solids expand by the same amount when heated to the same rise in temperature.
A mercury thermometer makes use of the property of expansion of liquids on heating.
Alcohol expands ........... than water.
Iron expands ............ than copper.
Two rods A and B of the same metal, same length, but one solid and the other hollow, are heated to the same rise in temperature.
Name the three states of matter and distinguish them on the basis of their (i) volume, and (ii) shape
What is evaporation? Explain it on the basis of molecular motion.
Two identical rods, one hollow and the other solid are heated to the same rise in temperature. Which will expand more?
What do you mean by anomalous behaviour of water?
Give two uses of a bimetal strip.
