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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?
Answer in one sentence.
What is an elastomer?
Long answer type question.
Define stress and strain. What are their different types?
The stress-strain curves are drawn for two different materials X and Y. It is observed that the ultimate strength point and the fracture point are close to each other for material X but are far apart for material Y. We can say that materials X and Y are likely to be (respectively).
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).
Answer in one sentence.
What is an elastomer?
Answer in one sentence.
What is an elastomer?
Answer in one sentence:
What is an elastomer?
Answer in one sentence:
What is an elastomer?
Answer in one sentence:
What is an elastomer?
What is an elastomer?
Answer in one sentence:
What is an elastomer?
Answer in one sentence.
What is an elastomer?
Answer in one sentence.
What is an elastomer?
In the stress-strain curve, which region obeys Hooke's law?
Which of the following materials can be hammered into thin sheets?
