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प्रश्न
Why is one end of a steel girder in a bridge kept on rollers instead of fixing it in pillar?
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उत्तर
In summer when the temperature increases considerably the bridge made of metal expands and rollers slide to allow for expansion otherwise the bridge may break the pillar.
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संबंधित प्रश्न
Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.
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Give scientific reason.
An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not.
Complete the following sentence:
When ice melts its volume ______ and density _______.
A bimetal strip is shown in the below diagram before heating. Draw a diagram to show how it bends on heating and on cooling.
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.
Analogy:
Ordinary glass:: Glass tumbler.
Pyrex glass:: ______.
How solids are expanded on heating?
