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Physics Chapter 7 : Topic 5
Elastic and Plastic Deformation
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Elastic deformation is the type of deformation in which a material:
Reasoning: Elastic deformation is reversible; the material regains its original dimensions when the applied force is removed.
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Plastic deformation occurs when a material:
Reasoning: Plastic deformation is irreversible because the material remains permanently deformed after removing the force.
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The elastic limit of a material is the maximum stress at which:
Reasoning: Beyond the elastic limit, permanent deformation begins.
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A rubber band is stretched and returns to its original length when released. This is an example of:
Reasoning: The rubber band recovers its original shape, showing elastic behavior.
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A metal wire is stretched beyond its elastic limit and remains longer after the force is removed. This is:
Reasoning: Permanent extension after removing force indicates plastic deformation.
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The region in which stress is proportional to strain is:
Reasoning: Hooke’s law applies within the elastic region.
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If a spring returns to its original shape after being stretched, the spring has experienced:
Reasoning: Recovery of original shape indicates elastic deformation.
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Which of the following materials commonly shows plastic deformation when permanently bent?
Reasoning: A spoon bent permanently has exceeded its elastic limit.
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When the applied force on a material exceeds the elastic limit:
Reasoning: Beyond the elastic limit, the material enters the plastic region.
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A material with a large elastic limit can:
Reasoning: A large elastic limit means the material can withstand greater stress without permanent deformation.
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Which graph region represents elastic behavior in a stress-strain curve?
Reasoning: Elastic behavior occurs before the elastic limit where deformation is reversible.
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The difference between elastic and plastic deformation is based mainly on:
Reasoning: Elastic deformation is reversible, while plastic deformation is permanent.
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A wire is stretched slightly and returns to its original length after unloading. The wire was:
Reasoning: Returning to original length shows that the deformation was elastic.
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A plastic ruler bends and remains bent after applying a force. This shows:
Reasoning: Permanent bending indicates plastic deformation.
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The elastic limit is important because it separates:
Reasoning: The elastic limit is the boundary between reversible and permanent deformation.
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A material that undergoes elastic deformation:
Reasoning: Elastic materials store energy when deformed and release it when returning to original shape.
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Which example represents elastic deformation?
Reasoning: A spring returns to its original shape after small deformation.
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Which example represents plastic deformation?
Reasoning: A paper clip remains bent after removing the force, showing plastic deformation.
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When a material is in the elastic region, increasing force causes:
Reasoning: In the elastic region, deformation is reversible and follows Hooke’s law.
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Which statement about plastic deformation is correct?
Reasoning: Plastic deformation begins when the elastic limit is exceeded.
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A wire is stretched until it reaches the elastic limit. If the load is removed at this point, the wire will:
Reasoning: At the elastic limit, deformation is still reversible.
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The permanent deformation of a material is associated with:
Reasoning: Plastic region produces irreversible changes in shape.
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Which property determines how much a material can deform elastically?
Reasoning: Elastic limit defines the maximum elastic deformation a material can withstand.
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If a material returns to its original shape after a force is removed, the internal forces:
Reasoning: Restoring forces within the material cause recovery of shape.
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A metal wire is loaded gradually. Initially, the wire stretches and returns to its original length. Later it remains stretched. The change occurs because:
Reasoning: Passing the elastic limit changes the behavior from elastic to plastic.
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A highly elastic material is one that:
Reasoning: Elasticity refers to the ability to regain original dimensions.
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Which material behavior is required for a spring used in a machine?
Reasoning: Springs must return to their original shape after use.
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The deformation of a material depends mainly on:
Reasoning: The amount and type of deformation depend on the applied force and elasticity of the material.
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A wire is stretched beyond its elastic limit but not broken. After removing the force, it:
Reasoning: Beyond the elastic limit, the wire experiences plastic deformation.
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Which statement correctly describes the elastic limit?
Reasoning: Elastic limit marks the maximum reversible deformation.
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A small deformation caused by a small force is most likely:
Reasoning: Small forces usually produce reversible deformation within the elastic region.
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If a material has a very low elastic limit, it:
Reasoning: Low elastic limit means permanent deformation occurs at smaller stresses.
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The ability of a material to recover its original shape is called:
Reasoning: Elasticity is the property of returning to original shape after removing force.
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The ability of a material to retain a new shape after deformation is called:
Reasoning: Plasticity describes permanent deformation.
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A material used for making permanent shapes in manufacturing should have:
Reasoning: Plastic materials can be permanently shaped without returning to their original form.
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A spring that is stretched too far and does not return to its original length has:
Reasoning: Permanent stretching occurs when the elastic limit is exceeded.
37 / 40
The deformation of a material before reaching elastic limit is:
Reasoning: Before elastic limit, deformation disappears after removing the applied force.
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A ball compressed slightly and then regaining its shape demonstrates:
39 / 40
The relationship between elastic deformation and elastic limit is:
Reasoning: Materials behave elastically when the applied stress remains below the elastic limit.
40 / 40
Which factor determines whether deformation is elastic or plastic?
Reasoning: Crossing the elastic limit changes deformation from reversible to permanent.
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