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प्रश्न
Why are gaps left between successive rails on a railway track ?
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उत्तर
The rails of railway track are made of steel. While laying the railway track, a small gap is left between the two successive length of rails. The reason is that the rails expand in summer. The gap is provided to allow for this expansion. If no gap is left, the expansion in summer will cause the rails to bend sideways. This may result in a train accidents.
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संबंधित प्रश्न
Write true or false for a given statement.
All solids expand by the same amount when heated to the same rise in temperature.
Write true or false for a given statement.
Solids expand the least and gases expand the most on being heated.
Fill in the blank
The temperature of boiling water is _______
Fill in the blank
Liquids expand _______ than the solids.
Describe an experiment to show that air expands on heating.
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
Explain why we wear woolen clothes in winter.
Explain why the water pipes are covered with cotton during very cold weather.
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 |
Explain the following effects of heat.
Expansion
