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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Which of the following affects the elasticity of a substance

(a) Hammering and annealing

(b) Change in temperature

(c) Impurity in substance

(d) All of these

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A wire of diameter 1mm  breaks under a tension of 1000 N. Another wire, of same material as that of the first one, but of diameter 2 mm breaks under a tension of

(a)   500 N                                (b)   1000 N

(c)   10000 N                            (d)   4000 N

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There is no change in the volume of a wire due to change in its length on stretching. The Poisson's ratio of the material of the wire is

(a)   + 0.50                                (b)   – 0.50

(c)   0.25                                   (d)   – 0.25

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The force required to stretch a steel wire of cross-section 1 cm2 to 1.1 times its length would be Y=2×1011 Nm-2

(a) 2×106N                               (b) 2×103N

(c) 2×10-6N                             (d) 2×10-7N

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When a weight of 10 kg is suspended from a copper wire of length 3 metres and diameter 0.4 mm, its length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be

(a) 9.6 cm                               (b) 4.8 cm

(c) 1.2 cm                               (d) 0.6 cm

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A fixed volume of iron is drawn into a wire of length L. The extension x produced in this wire by a constant force F is proportional to

(a) 1L2                                              (b) 1L

(c) L2                                                (d) L

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