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प्रश्न
Answer in one sentence.
Why bridges are unsafe after very long use?
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उत्तर
A bridge during its use undergoes recurring stress depending upon the movement of vehicles on it. When bridge is used for long time, it loses its elastic strength and ultimately may collapse. Hence, the bridges are declared unsafe after long use.
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संबंधित प्रश्न
Anvils made of single crystals of diamond, with the shape as shown in Figure, are used to investigate the behaviour of materials under very high pressures. Flat faces at the narrow end of the anvil have a diameter of 0.50 mm, and the wide ends are subjected to a compressional force of 50,000 N. What is the pressure at the tip of the anvil?
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Answer in short.
What do you mean by brittle substance? Give any two examples.
Long answer type question.
Draw a labelled graph of tensile stress against tensile strain for a metal wire up to the breaking point. In this graph show the region in which Hooke’s law is obeyed.
The stress-strain graphs for two materials are shown in figure (assume same scale).
 Material (i) |
 Material (i) |
- Material (ii) is more elastic than material (i) and hence material (ii) is more brittle.
- Material (i) and (ii) have the same elasticity and the same brittleness.
- Material (ii) is elastic over a larger region of strain as compared to (i).
- Material (ii) is more brittle than material (i).
The stress-strain graphs for two materials are shown in figure (assume same scale).
Material (i) |
Material (i) |
- Material (ii) is more elastic than material (i) and hence material (ii) is more brittle.
- Material (i) and (ii) have the same elasticity and the same brittleness.
- Material (ii) is elastic over a larger region of strain as compared to (i).
- Material (ii) is more brittle than material (i).
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Answer in one sentence.
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What is an elastomer?
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What is an elastomer?
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What is an elastomer?
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Answer in one sentence:
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What is an elastomer?
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In the stress-strain curve, which region obeys Hooke's law?
What happens to a metal wire when stress is removed at a point between O and B on the stress-strain curve?
Which of the following materials can be hammered into thin sheets?
