The Young's modulus of a wire of length 'L' and radius 'r' is 'Y'. If length is reduced to L/2 and radius r/2, then Young's modulus will be 

1. Y/2

2. Y

3. 2Y

4. 4Y

Subtopic:  Young's modulus |
 55%
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Three wires \(A,B,C\) made of the same material and radius have different lengths. The graphs in the figure show the elongation-load variation. The longest wire is:
                    
1. \(A\)
2. \(B\)
3. \(C\)
4. All of the above

Subtopic:  Stress - Strain Curve |
 67%
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If Young modulus (Y) equal to bulk modulus (B). Then the Poisson ratio is :

1. 13

2. 23

3. 12

4. 14

Subtopic:  Poisson's Ratio |
 52%
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When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one, then the increase in length will be -

1. 0.5 cm                             

2. 2 cm

3. 4 cm                                 

4. 8 cm

Subtopic:  Young's modulus |
 71%
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A force \(F\) is needed to break a copper wire having radius \(R.\) The force needed to break a copper wire of radius \(2R\) will be:

1. \(F/2\) 2. \(2F\)
3. \(4F\) 4. \(F/4\)
Subtopic:  Stress - Strain |
 73%
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The Young's modulus of a rubber string 8 cm long and density 1.5 kg/m3 is 5×108 N/m2, is suspended on the ceiling in a room. The increase in length due to its own weight will be

1. 9.6×10-5 m                           

2. 9.6×10-11m

3. 9.6×10-3 m                           

4. 9.6 m

Subtopic:  Young's modulus |
 77%
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If the length of a wire is reduced to half, then it can hold the ......... load

1. Half                                 

2. Same

3. Double                             

4. One fourth

Subtopic:  Stress - Strain |
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Two wires of copper having length in the ratio of \(4:1\) and radii ratio of \(1:4\) are stretched by the same force. The ratio of longitudinal strain in the two will be:

1. \(1:16\) 2. \(16:1\)
3. \(1:64\) 4. \(64:1\)
Subtopic:  Hooke's Law |
 63%
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A wire of length L and radius r is  rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in its length is l. If another wire of same material but of length 2L and radius 2r is stretched with a force of 2F, the increase in its length will be

1. l                                       
2. 2l
3. l2                                   
4. l4 

Subtopic:  Hooke's Law |
 76%
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In steel, the Young's modulus and the strain at the breaking point are 2×1011Nm-2 and 0.15 respectively. The stress at the breaking point for steel is therefore -

1. 1.33×1011Nm-2           

2. 1.33×1012Nm-2

3. 7.5×10-13Nm-2           

4. 3×1010Nm-2

Subtopic:  Young's modulus |
 82%
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