Shearing stress causes a change in-

(1)   Length                              

(2)   Breadth

(3)   Shape                               

(4)   Volume

Subtopic:  Stress - Strain |
 76%
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To break a wire, a force of 106N/m2 is required. If the density of the material is 3×103 kg/m3, then the length of the wire which will break by its own weight will be -

(a) 34 m                             (b) 30 m

(c) 300 m                            (d) 3 m

Subtopic:  Stress - Strain |
 53%
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The strain-stress curves of three wires of different materials are shown in the figure. \(P\), \(Q\) and \(R\) are the elastic limits of the wires. The figure shows that:
           

1. Elasticity of wire \(P\) is maximum.
2. Elasticity of wire \(Q\) is maximum.
3. Tensile strength of \(R\) is maximum.
4. None of the above is true.
Subtopic:  Stress - Strain Curve |
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The diagram shows a force-extension graph for a rubber band. Consider the following statements

I. It will be easier to compress this rubber than expand it

II. Rubber does not return to its original length after it is stretched

III. The rubber band will get heated if it is stretched and released

 Which of these can be deduced from the graph?

(1)   III only                              

(2)   II and III

(3)   I and III                            

(4)   I only

Subtopic:  Stress - Strain Curve |
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The adjacent graph shows the extension l of a wire of length 1m suspended from the top of a roof at one end with a load W connected to the other end. If the cross sectional area of the wire is 10-6m2 calculate the young’s modulus of the material of the wire

(a) 2×1011N/m2

(b) 2×10-11N/m2

(c) 3×10-12N/m2

(d) 2×10-13N/m2

Subtopic:  Stress - Strain Curve |
 80%
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The diagram shows stress v/s strain curve for the materials A and B. From the curves we infer that

(1) A is brittle but B is ductile  

(2) A is ductile and B is brittle

(3) Both A and B are ductile      

(4) Both A and B are brittle

Subtopic:  Stress - Strain Curve |
 69%
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If the potential energy of a spring is V on stretching it by 2 cm, then its potential energy when it is stretched by 10 cm will be

(1) V/25                                   

(2) 5V

(3) V/5                                    

(4) 25V

Subtopic:  Potential energy of wire |
 67%
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Two wires of same diameter of the same material having the length l and 2l. If the force F is applied on each, the ratio of the work done in the two wires will be

(1) 1 : 2                                   

(2) 1 : 4

(3) 2 : 1                                   

(4) 1 : 1

Subtopic:  Potential energy of wire |
 57%
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A \(5\) m long wire is fixed to the ceiling. A weight of \(10\) kg is hung at the lower end and is \(1\) m above the floor. The wire was elongated by \(1\) mm. The energy stored in the wire due to stretching is:
1. zero                                 
2. \(0.05\) J
3. \(100\) J                          
4. \(500\) J

Subtopic:  Potential energy of wire |
 78%
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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. \(\frac{Kl}{2}\)
2. \(Kl\)
3. \(\frac{Kl^2}{2}\)
4. \(Kl^2\)

Subtopic:  Potential energy of wire |
 70%
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