A uniform wire of length 3m and mass 10 kg is suspended vertically from one end and loaded at another end by a block of mass 10 kg. The radius of the cross-section of the wire is 0.1 m. The stress in the middle of the wire is: (g = 10 ms-2)

1. 1.4 x 104 N/m2

2. 4.8 x 103 N/m2

3. 96 x 104 N/m2

4. 3.5 x 103 N/m2

Subtopic:  Stress - Strain |
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A uniform wire is held at one end and stretched by applying force at the other end. If the product of the length of wire and area of cross-section of the wire remains unchanged, then Poisson's ratio of material of the wire will be:
1. 0
2. 0.50
3. -0.5
4. Infinity

Subtopic:  Poisson's Ratio |
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The elongation (x) of a steel wire varies with the elongating force (F) according to the graph: (within elastic limit)

1. 2.
3. 4.
Subtopic:  Stress - Strain Curve |
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The stress-strain curve for two materials A and B are as shown in the figure. Select the correct statement-

       

1. Material A is less brittle and less elastic as compared to B

2. Material A is more ductile and less elastic as compared to B

3. Material A is less brittle and more elastic than B

4. Material B is more brittle and more elastic than A

Subtopic:  Stress - Strain Curve |
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The Young's modulus of a wire is numerically equal to the stress at a point when:

1. the strain produced in the wire is equal to unity.

2. the length of the wire gets doubled.

3. the length increases by 100%.

4. All of these

Subtopic:  Young's modulus |
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Two wires X and Y of the same length are made of the same material. The figure represents the load F versus extension x graph for the two wires. Hence:

    

1. Modulus of elasticity of Y is greater than that of X.
2. Stiffness of Y is more than that of X.
3. The cross-sectional area of Y is less than that of X.
4. All of these

Subtopic:  Stress - Strain Curve |
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A metallic rope of diameter 1 mm breaks at 10 N force. If the wire of the same material has a diameter of 2 mm, then the breaking force is:
1. 2.5 N
2. 5 N
3. 20 N
4. 40 N

Subtopic:  Young's modulus |
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The Poisson's ratio of a material is 0.4. If a force is applied to a wire of this material, there is a decrease in the cross-section area by 2%. In such a case the percentage increase in its length will be:

1. 3%

2. 2.5%

3. 1%

4. 0.5%

Subtopic:  Poisson's Ratio |
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The breaking stress of a wire going over a smooth pulley in the following question is 2 × 109 N/m2. What would be the minimum radius of the wire used if it is not to break?

    

1.  0.46 × 10-6 m

2.  0.46 × 10-4 m

3.  0.46 × 108 m

4.  0.46 × 10-11 m

Subtopic:  Stress - Strain |
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The increase in the length of a wire on stretching is 0.04%. If Poisson's ratio for the material of wire is 0.5, then the diameter of the wire will:
1. decrease by 0.02%.
2. decrease by 0.01%.
3. decrease by 0.04%.
4. increase by 0.03%.

Subtopic:  Poisson's Ratio |
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