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प्रश्न
Iron rims are heated before they are fixed on the wooden wheels.
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उत्तर
Iron rims are made slightly smaller in diameter than the wooden wheel and on heating, wheel expands and can easily slip over the wooden wheel and on cooling the rim contracts and MAKES A TIGHT FIT OVER the wooden wheel.
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संबंधित प्रश्न
Equal volumes of different liquids expand by a different amount when they are heated to the same rise in temperature.
What do you understand by thermal expansion of a substance?
State three factors on which depend the linear expansion of a metal rod on heating.
Two iron rods – one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?
Give scientific reason.
An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not.
Give scientific reason.
The telephone wires which sag in summer become straight in winter.
Solids ______ on heating and ______ on cooling.
Give reason for the following
An ordinary glass bottle cracks when boiling water is poured into it, but a borosilicate glass bottle does not.
How solids are expanded on heating?
