The work done in stretching an elastic wire per unit volume is:

1. Stress × Strain                     

2. 12× Stress ×Strain

3. 2×strain×stress                   

4. Stress/Strain

Subtopic:  Potential energy of wire |
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An elastic material of Young's modulus Y is subjected to a stress S. The elastic energy stored per unit volume of the material is:

1. SY2  

2. S22Y

3.  S2Y 

4.2SY

Subtopic:  Potential energy of wire |
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If E is the energy stored per unit volume in a wire having Y as Young's modulus of the material, then stress applied is:

1.  2EY

2.  2EY

3.  12EY

4.  32EY

Subtopic:  Potential energy of wire |
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The Young's modulus of a wire is Y.  If the energy per unit volume is E, then the strain will be:

1. 2EY                                         

2. 2EY

3. EY                                             

4. EY

Subtopic:  Potential energy of wire |
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A wire of length L and cross-sectional area A is made of a material of Young's modulus Y. It is stretched by an amount x. The work done is -

1. YxA2L

2. Yx2AL

3. Yx2A2L

4. 2Yx2AL

Subtopic:  Potential energy of wire |
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A 5 metre long wire is fixed to the ceiling. A weight of 10 kg is hung at the lower end and is 1 metre above the floor. The wire was elongated by 1 mm. The energy stored in the wire due to stretching is:

1. Zero                                 

2. 0.05 joule

3. 100 joule                          

4. 500 joule

Subtopic:  Potential energy of wire |
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The ratio of Young's modulus of the material of two wires is 2 : 3. If the same stress is applied on both, then the ratio of elastic energy per unit volume will be-

1. 3 : 2                                   

2. 2 : 3

3. 3 : 4                                   

4. 4 : 3

Subtopic:  Potential energy of wire |
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The work done per unit volume to stretch the length of a wire by 1%  with a constant cross-sectional area will be: Y=9×1011N/m2

1. 9×1011 J

2. 4.5×107J

3. 9×107J

4. 4.5×1011 J

Subtopic:  Potential energy of wire |
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If the force constant of a wire is K, the work done in increasing the length of the wire by l is

1. Kl/2                                   

2. Kl

3. Kl2/2                                 

4. Kl2

Subtopic:  Potential energy of wire |
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A wire of negligible mass and length 2m is stretched by hanging a 20 kg load to its lower end keeping its upper end fixed. If work done in stretching the wire is 50 J, then the strain produced in the wire will be:

1. 0.5

2. 0.1

3. 0.4

4. 0.25

Subtopic:  Potential energy of wire |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology