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प्रश्न
Why do telephone wires sag in summer ?
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उत्तर
The telephone wires will sag in summer due to expansions and will break in winter due to contraction.
Therefore, while putting up the wires between the poles, care is taken that in summer they are kept slightly loose so that they may not break in winter due to contraction.
While in winter they are kept light so that they may not sag too much in summer due to expansion.
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संबंधित प्रश्न
Write true or false for a given statement.
Telephone wires are kept tight between the two poles in summer.
Write true or false for a given statement.
A mercury thermometer makes use of the property of the expansion of liquids on heating.
Fill in the blank
On heating a body, its temperature _______.
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We use a ________ for measuring the temperature of a body.
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The temperature of boiling water is _______
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Still air is an __________ of heat.
Name two substances which expand on heating.
State one application of thermal expansion of liquids.
In ice cubes, the force of attraction between the water molecules is ______.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
