If the length of a wire is reduced to half, then it can hold the ......... load

(a) Half                                  (b) Same

(c) Double                              (d) One fourth

Concept Questions :-

Stress-strain
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Why the spring is made up of steel in comparison of copper

(a)   Copper is more costly than steel

(b)   Copper is more elastic than steel

(c)   Steel is more elastic than copper

(d)   None of the above

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Steel and copper wires of same length are stretched by the same weight one after the other. Young's modulus of steel and copper are 2×1011N/m2 and 1.2×1011N/m2. The ratio of increase in length

(a) 25                                 (b) 35

(c) 54                                 (d) 52

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The temperature of a wire of length 1 metre and area of cross-section 1cm2 is increased from 0°C to 100°C. If the rod is not allowed to increase in length, the force required will be α=10-5/°C and Y=1011N/m2

(a) 103N                     (b) 104N

(c) 105N                     (d) 109N

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Two wires of copper having the length in the ratio 4 : 1 and their radii ratio as 1 : 4 are stretched by the same force. The ratio of longitudinal strain in the two will be

(a) 1 : 16                                             (b) 16 : 1

(c) 1 : 64                                             (d) 64 : 1

Concept Questions :-

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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

Concept Questions :-

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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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