The breaking stress of a wire depends upon

1. material of the wire

2. length of the wire

3. radius of the wire

4. shape of the cross section

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The material which practically does not show elastic after effect is 

(a) Copper                          (b) Rubber

(c) Steel                             (d) Quartz

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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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Which one of the following substances possesses the highest elasticity

(a) Rubber                             (b) Glass

(c) Steel                               (d) Copper

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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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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

(a) V/25                                   (b) 5V

(c) V/5                                     (d) 25V

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When strain is produced in a body within elastic limit, its internal energy

(a) Remains constant                   (b) Decreases

(c) Increases                               (d) None of the above

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When shearing force is applied on a body, then the elastic potential energy is stored in it. On removing the force, this energy

1. Converts into kinetic energy

2. Converts into heat energy

3. Remains as potential energy

4. None of the above

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A stretched rubber has

(a) Increased kinetic energy

(b) Increased potential energy

(c) Decreased kinetic energy

(d) Decreased potential energy

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