The breaking stress of a wire depends upon:
1. | material of the wire. |
2. | length of the wire. |
3. | radius of the wire. |
4. | shape of the cross-section. |
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The breaking stress of a wire going over a smooth pulley in the following question is What would be the minimum radius of the wire used if it is not to break?
1. | 2. | ||
3. | 4. |
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A light rod of length is suspended from the ceiling horizontally by means of two vertical wires of equal length. A weight is hung from the light rod as shown in the figure. The rod is hung by means of a steel wire of cross-sectional area and brass wire of cross-sectional area To have equal stress in both wires,
1. | 2. | ||
3. | 4. |
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To break a wire, a force of is required. If the density of the material is then the length of the wire which will break by its own weight will be:
1.
2.
3.
4.
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A uniform wire of length m and mass kg is suspended vertically from one end and loaded at another end by a block of mass kg. The radius of the cross-section of the wire is m. The stress in the middle of the wire is: (Take ms-2)
1. | N/m2 | 2. | N/m2 |
3. | N/m2 | 4. | N/m2 |
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lf is the density of the material of a wire and is the breaking stress, the greatest length of the wire that can hang freely without breaking is:
1.
2.
3.
4.
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One end of a uniform wire of length and of weight is attached rigidly to a point in the roof and a weight is suspended from its lower end. If is the area of the cross-section of the wire, the stress in the wire at a height from its lower end is:
1.
2.
3.
4.
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A wire can sustain a weight of 10 kg before breaking. If the wire is cut into two equal parts, then each part can sustain a weight of:
1. | 2.5 kg | 2. | 5 kg |
3. | 10 kg | 4. | 15 kg |
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The length of an elastic string is metre when the longitudinal tension is N and metre when the longitudinal tension is N. The length of the string in metre when the longitudinal tension is N will be:
1. | 2. | ||
3. | 4. |
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