The force constant of a wire does not depend on

(a) Nature of the material                      (b) Radius of the wire

(c) Length of the wire                           (d) None of the above

Concept Questions :-

Stress-strain
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The length of a wire is 1.0 m and the area of cross-section is 1.0×10-2cm2. If the work done for increase in length by 0.2 cm is 0.4 joule, then Young's modulus of the material of the wire is

(a) 2.0×1010N/m2             (b) 4×1010N/m2

(c) 2.0×1011N/m2             (d) 2×1010N/m2

Concept Questions :-

Stress-strain
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The quality of the material which opposes the change in shape, volume or length is called

(a)   Intermolecular repulsion

(b)   Intermolecular behaviour

(c)   Viscosity

(d)   Elasticity

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For silver, Young's modulus is 7.25×1010 N/m2 and Bulk modulus is 11×1010 N/m2. Its Poisson's ratio will be

1. -1                                     2. 0.5

3. 0.39                                  4. 0.25

Concept Questions :-

Poisson ratio
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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

(a) l                                       (b) 2l

(c) l2                                    (d) l4 

Concept Questions :-

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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 -

(a) 1.33×1011Nm-2           (b) 1.33×1012Nm-2

(c) 7.5×10-13Nm-2           (d) 3×1010Nm-2

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Which one of the following substances possesses the highest elasticity

(a) Rubber                             (b) Glass

(c) Steel                               (d) Copper

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Which one of the following quantities does not have the unit of force per unit area

(a) Stress                                      

(b) Strain

(c) Young's modulus of elasticity

(d) Pressure

Concept Questions :-

Stress-strain
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A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied, which stretches their combined length by 1 cm. The two wires will have

(a)   Different stresses and strains

(b)   The same stress and strain

(c)   The same strain but different stresses

(d)   The same stress but different strains

Concept Questions :-

Stress-strain
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The possible value of Poisson's ratio is

(a) 1                                        (b) 0.9

(c) 0.8                                      (d) 0.4

Concept Questions :-

Poisson ratio
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