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प्रश्न
Iron rims are heated before they are fixed on the wooden wheels. Explain the reason.
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उत्तर
The wooden wheels of a bullock-cart are fitted with iron tyres. To ensure a tight fit, the tyre is made slightly smaller in diameter than the wheel. The tyre is first heated due to which it expands. The heated tyre is then fitted on the wheel. When the tyre cools, it contracts and makes a tight fit on the wheel.
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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.
Fill in the blank
Gases expand _______ than the liquids.
Fill in the blank
Still air is an __________ of heat.
Describe an experiment to show that air expands on heating.
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.
Name a solid which is a good conductor of heat.
Why is a tea kettle provided with an ebonite handle?
In ice cubes, the force of attraction between the water molecules is ______.
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 |
______ is greater for liquids than solids and it is maximum in gases.
